Objective Biology for NEET

Rajiv Vijay

Chapter 15

Plant Growth and Development - all with Video Answers

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Chapter Questions

Problem 1

What occurs due to the plants growth and development?
(a) Leaves, flowers, fruits, etc., arise in an orderly pattern
(b) Increase in girth
(c) Falling of leaves and fruits
(d) All the above

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Problem 2

Development consists of
(a) Growth
(b) Differentiation
(c) Both (a) and (b)
(d) None of these

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Problem 3

Which of the following is correct about the development of a mature plant from a zygote?
(a) Follows a precise and ordered succession of events
(b) Only differentiation occurs
(c) Occurs due to environmental effect only
(d) None of the above

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Problem 4

What kinds of factors govern a plant's developmental process?
(a) Intrinsic factors
(b) Extrinsic factors
(c) Both (a) and (b)
(d) None of these

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Problem 5

All cells of the plants are descendants of
(a) Zygote
(b) Seeds
(c) gametes
(d) Both (b) and (c)

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Problem 6

Appearance and fall of fruits occurs due to
(a) Hormonal influence
(b) Growth and development
(c) Differentiation
(d) Both (a) and (b)

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Problem 7

Which is one of the most fundamental and conspicuous characteristic of living being?
(a) Development
(b) Differentiation
(c) Maturation
(d) Growth

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Problem 8

What is an irreversible permanent increase in size of an organ or its part or even of an individual cell?
(a) Development
(b) Differentiation
(c) Growth
(d) Maturation

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Problem 9

Growth is accompanied by
(a) Anabolism
(b) Catabolism
(c) Both (a) and (b)
(d) None of these

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Problem 10

Metabolism occurs on the expense of
(a) Nutrition
(b) Water
(c) Energy
(d) Hormones

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Problem 11

If expansion of leaf occurs, it is known as
(a) Swelling
(b) Imbibitions
(c) Differentiation
(d) Growth

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Problem 12

Why the growth of a plant is unique?
(a) The plant retains the capacity of unlimited growth.
(b) The plant can regenerate the same characters.
(c) There is no change in offspring's characters.
(d) None of the above

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Problem 13

The unique ability to retain the capacity of growth in plants is due to the presence of
(a) Lifetime differentiation
(b) Activator hormones
(c) Chlorophyll to utilize energy lifetime
(d) Meristems at certain locations

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Problem 14

What is the special feature of meristem?
(a) It is present in every tissue
(b) Its capacity to divide
(c) Its capacity to self-perpetuate
(d) Both (b) and (c)

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Problem 15

Cells that further make up the plant body
(a) Loose capacity to divide
(b) Loose capacity to grow
(c) Loose capacity to differentiate
(d) None of these

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Problem 16

Continued growth due to activity of meristem is which type of growth?
(a) Closed growth
(b) Open growth
(c) Both (a) and (b)
(d) None of these

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Problem 17

Meristems are found in
(a) Root apex
(b) Shoot apex
(c) Both (a) and (b)
(d) None of these

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Problem 18

Meristems are responsible for
(a) Secondary growth
(b) Primary growth
(c) Both (a) and (b)
(d) None of these

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Problem 19

What is the contribution of meristem in growth of plant?
(a) Elongation along the axis
(b) Differentiation
(c) Both (a) and (b)
(d) None of these

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Problem 20

Secondary growth of plant occurs due to
(a) Lateral meristems
(b) Vascular cambium
(c) Cork cambium
(d) All of these

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Problem 21

At cellular level, growth is an
(a) Increase in cytoplasm
(b) Increase in size
(c) Increase in nuclear size
(d) Increase in protoplasm

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Problem 22

Which of the following is not the parameter for measuring growth?
(a) Wet weight
(b) Dry weight
(c) Volume
(d) Cell member

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Problem 23

One single maize root apical meristem can give rise to how many cells per hour?
(a) 17500
(b) $>17500$
(c) $<17500$
(d) None of these

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Problem 24

By how many times, the cells of watermelon increase in size?
(a) $3,15,000$
(b) $3,50,000$
(c) $3,25,000$
(d) $3,17,000$

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Problem 25

In question 23 and 24 respectively growth can be expressed as increase in cell.
(a) Size, number
(b) Volume, size
(c) Number, size
(d) Size, volume

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Problem 26

Growth of pollen tube is measured in terms of
(a) Weight
(b) Width
(c) Volume
(d) Length

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Problem 27

Growth of a dorsiventral leaf can be measured in terms of
(a) Length
(b) Width
(c) Volume of cells
(d) Surface area

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Problem 28

Which of the following are phases of growth?
(a) Meristemation
(b) Elongation
(c) Maturation
(d) All of these

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Problem 29

Identify $\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}$ and $\mathrm{E}$ in the given figure.

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Problem 30

Which of the following represent meristematic phase of growth?
(a) Root apex
(b) Shoot apex
(c) Both (a) and (b)
(d) None of these

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Problem 31

Which of the following represent meristematic phase of growth?
(a) Root apex
(b) Shoot apex
(c) Both (a) and (b)
(d) None of these

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Problem 32

Which of the following is not the characteristics of cell wall of meristematic cells?
(a) Primary in nature
(b) Cellulosic
(c) Abundant plasmodesmata
(d) None of these

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Problem 33

Where can we find cells representing the phases of elongation?
(a) Root Apex
(b) Shoot Apex
(c) Cells proximal to both
(d) All of these

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Problem 34

Which of the following is not the characteristic of the cells in elongation phase?
(a) Cell enlargement
(b) New cell wall deposition
(c) Decrease in volume
(d) Both (a) and (b)

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Problem 35

Cells proximal to the phase of elongation show
(a) Meristematic phase
(b) Maturative phase
(c) Elongation phase
(d) All of these

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Problem 36

What is $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ in the given figure?(a) A-Shoot apical meristem, B-Root apical meristem, C-Vascular cambium
(b) A-Vascular cambium, B-Root apical meristem, C-Shoot apical meristem
(c) A-Root apical meristem, B-Vascular cambium, C-Shoot apical meristem
(d) A-Vascular cambium, B-Shoot apical meristem, C-Root apical meristem

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Problem 37

Cells of maturative phase show
(a) Thickening of walls
(b) Protoplasmic modification
(c) Both (a) and (b)
(d) None of these

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Problem 38

Increased growth per unit time is called
(a) Growth rate
(b) Growth speed
(c) Both (a) and (b)
(d) None of these

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Problem 39

The growth rate shows an increase that can be
(a) Mathematical
(b) Arithmetic
(c) Geometrical
(d) Both (b) and (c)

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Problem 40

In arithmetic growth, other than daughter cells, what happens to the other cells?
(a) They undergo maturation
(b) They undergo differentiation
(c) Both (a) and (b)
(d) They undergo continuous cell division

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Problem 41

Examples of arithmetic growth is/are
(a) Root elongation
(b) Increase in girth
(c) Both (a) and (b)
(d) None of these

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Problem 42

Slow initial growth is called
(a) Log phase
(b) Lag phase
(c) Exponential phase
(d) None of these

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Problem 43

The rapidly increase in growth after showing initial period is called
(a) Log phase
(b) Leg phase
(c) Both (a) and (b)
(d) None of these

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Problem 44

What is the speciality of the cells after mitotic cell division in geometric growth?
(a) Thickened cell wall
(b) Occurring of well organized growth
(c) Retaining the ability to divide
(d) None of these

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Problem 45

Stationary phase occurs due to
(a) Increase in distance
(b) Limited nutrient supply
(c) Thickening of cell wall
(d) None of these

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Problem 46

Geometrical growth graphically shows
(a) Linear curve
(b) Sigmoid curve
(c) Both one by one
(d) Straight line

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Problem 47

Living organism growing in a natural environment can be found graphically by the presence of
(a) Sigmoid curve
(b) Linear curve
(c) Straight line
(d) All of these

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Problem 48

Sigmoid curve is typical for which components of plant body?
(a) Cells
(b) Tissue
(c) Organs
(d) All of these

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Problem 49

Exponential growth can be expressed as
(a) $\mathrm{W}_{1}=\mathrm{W}_{0} \mathrm{e}^{\mathrm{rt}}$
(b) $\mathrm{W}_{0}=\mathrm{W}_{1} \mathrm{e}^{\mathrm{rt}}$
(c) $\mathrm{W}_{1}=\mathrm{W}_{0} \mathrm{e}^{\Delta \mathrm{tt}}$
(d) None of these

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Problem 50

In the expression of exponential growth 'e'stands for (Question number 50-52 with respect to equation in question number 49 )
(a) Exponential growth rate
(b) Base of natural log
(c) Relative growth rate
(d) Change in size

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Problem 51

In expression of exponential growth ' $\mathrm{r}$ ' is referred to as
(a) Growth rate
(b) Efficiency index
(c) Both (a) and (b)
(d) Time of growth

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Problem 52

The final size, i.e., $\mathrm{W}_{1}$ depends principally on
(a) $\mathrm{W}_{0}$
(b) $\mathrm{r}$
(c) $\mathrm{t}$
(d) $\mathrm{e}$

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Problem 53

Quantitative comparisons can be made by
(a) Absolute growth rate
(b) Relative growth rate
(c) Both (a) and (b)
(d) None of these

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Problem 54

Measurement and comparison of total growth per unit time is called
(a) Absolute growth rate
(b) Relative growth rate
(c) Both (a) and (b)
(d) None of these

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Problem 55

The growth of the given system per unit time which is expressed on a common basis or per unit initial parameter is known as
(a) Absolute growth rate
(b) Relative growth rate
(c) Both (a) and (b)
(d) None of these

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Problem 56

Which of the following are not essential elements for growth?
(a) Water
(b) Oxygen
(c) Both (a) and (b)
(d) None of these

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Problem 57

Cell enlargement mainly requires
(a) Oxygen
(b) Water
(c) Nutrients
(d) None of these

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Problem 58

Extension of growth is supported by
(a) Oxygen
(b) Turgidity
(c) Osmosis
(d) Imbibitions

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Problem 59

Plant growth and further development is intimately linked to
(a) Oxygen requirement
(b) Maintaining temperature
(c) Water status
(d) None of these

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Problem 60

How does water help enzymatic activities needed for growth?
(a) Water maintains pH
(b) Water maintains temperature
(c) Water provides ions
(d) Water provides medium

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Problem 61

What helps in releasing the metabolic energy essential for growth activities?
(a) Oxygen
(b) Water
(c) Nutrients
(d) None of these

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Problem 62

What are required for the synthesis of protoplasm and act as source of energy?
(a) Oxygen
(b) Micronutrients
(c) Macronutrients
(d) Both (b) and (c)

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Problem 63

What can affect phases/stages of growth?
(a) Temperature
(b) Light
(c) Gravity
(d) All of these

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Problem 64

The process of derivation of cells from meristems and maturation to perform specific function is known as
(a) Regeneration
(b) Dedifferentiation
(c) Redifferentiation
(d) differentiation

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Problem 65

During differentiation, what kind of changes take place?
(a) Structural
(b) Functional
(c) Both (a) and (b)
(d) None of these

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Problem 66

What changes would occur in a cell to form a treachery element?
(a) Loose their protoplasm
(b) Strong, elastic, lignocelluloses secondary cell wall
(c) Both (a) and (b)
(d) None of these

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Problem 67

What is the phenomenon of dedifferentiation?
(a) Regaining the capacity to divide
(b) Loosing the capacity to divide
(c) Loosing the capacity to divide after regaining
(d) All of these

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Problem 68

What is re-differentiation?
(a) Regaining the capacity to divide
(b) Loosing the capacity to divide
(c) Loosing the capacity to divide after regaining
(d) All of these

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Problem 69

Identify A, B, C and D in the given figure.(a) A-Cell division, B-Senescence, C-Plasmatic growth, D-Mature cell
(b) A-Meristematic cell, B-Plasmatic growth, C-Maturation, D-Senescence
(c) A-Mature cell, B-Maturation, C-Senescence, D-Meristematic cell
(d) A-Maturation, B-Cell division, C-Meristematic cell, D-Differentiation

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Problem 70

What kind of differentiation is seen in plants?
(a) Open
(b) Close
(c) Primary
(d) All of these

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Problem 71

Identify the part of A, B and C in this figure.(a) A-Water habitat, B-Juvenile, C-Terrestrial habitat
(b) A-Juvenile, B-Terrestrial habitat, C-Water habitat
(c) A-Terrestrial habitat, B-Juvenile, C-Water habitat
(d) A-Juvenile, B-Water habitat, C-Terrestrial habitat

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Problem 72

Cells positioned away from root apical meristems, differentiate as
(a) Epidermis
(b) Root cap
(c) Both (a) and (b)
(d) None of these

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Problem 73

All those changes which an organism goes through during its life cycle from germination of the seed to senescence is termed as
(a) Growth
(b) Differentiation
(c) Development
(d) None of these

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Problem 74

On whose response the plasts follow different pathways to form different kind of structures?
(a) Environment
(b) Phases of life
(c) Both
(a) and (b)
(d) None of these

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Problem 75

The ability of plants to follow different pathways in response to environment or phases of life to form different kind of structures is called?
(a) Adaptation
(b) Differentiation
(c) Maturation
(d) Plasticity

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Problem 76

In which of the following plant the leaves of juvenile plant are different in shape than those in mature plants?
(a) Cotton
(b) Coriander
(c) Larkspur
(d) All of these

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Problem 77

Leaves of which plant show environmental heterophylly?
(a) Cotton
(b) Coriander
(c) Larkspur
(d) Buttercup

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Problem 78

The phenomenon of environmental heterophyll is also called
(a) Adaptation
(b) Maturation
(c) Plasticity
(d) Growth

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Problem 79

What is the sum of growth and differentiation?
(a) Plasticity
(b) Development
(c) Maturation
(d) All of these

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Problem 80

Development in plants is mainly controlled by
(a) Intrinsic factor
(b) Extrinsic factor
(c) Both (a) and (b)
(d) None of these

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Problem 81

Intrinsic factor for plant development includes
(a) Intercellular
(b) Intracellular
(c) Both (a) and (b)
(d) None of these

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Problem 82

Inter cellular factor required for development in plant include
(a) Chemical regulators
(b) Genetic
(c) Both (a) and (b)
(d) None of these

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Problem 83

Intracellular factor required for development in plant include
(a) Chemical regulators
(b) Genetic
(c) Both (a) and (b)
(d) None of these

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Problem 84

Extrinsic factor for plant development includes
(a) Light
(b) Temperature
(c) Water
(d) All of these

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Problem 85

Nutrition is included in which phase of plant development?
(a) Former
(b) Latter
(c) Both (a) and (b)
(d) None of these

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Problem 86

Oxygen is exchanged in which phase of plant development?
(a) Former
(b) Latter
(c) Both (a) and (b)
(d) None of these

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Problem 87

Which of the following is not a characteristic of a PGR?
(a) They are large
(b) Simple molecules
(c) They are of diverse chemical composition
(d) None of the above

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Problem 88

Match the following for PGR. Column I Column II
A. IAA
i. Carotenoids
B. Kinetin
ii. Terpenes
C. $\mathrm{ABA}$
iii. Indole compounds
D. $\mathrm{GA}_{3}$
-
iv. Adenine derivatives
(a) (A-iii) (B-iv) (C-i) (D-ii)
(b) (A-i) (B-iii) (C-ii) (D-iv)
(c) $(\mathrm{A}-\mathrm{iv})(\mathrm{B}-\mathrm{ii})(\mathrm{C}-\mathrm{iii})(\mathrm{D}-\mathrm{i})$
(d) $(\mathrm{A}-\mathrm{ii})(\mathrm{B}-\mathrm{i})(\mathrm{C}-\mathrm{iv})(\mathrm{D}-\mathrm{iii})$

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Problem 89

$\mathrm{N}^{6}$ -furfurylamino purine is which derivative?
(a) Indole compounds
(b) Adenine
(c) Terpenes
(d) Carotenoids

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Problem 90

How many of the following are phytohormones? $\mathrm{ABA}, \mathrm{C}_{2} \mathrm{H}_{4}, \mathrm{IAA}, \mathrm{GA}_{3}, \mathrm{ABA}$
(a) 2
(b) 3
(c) 4
(d) 5

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Problem 91

Which of the following is not a plant growth promoter?
(a) Auxins
(b) Gibberellins
(c) Ethylene
(d) Abscisic acid

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Problem 92

Who initiated the discovery of plant growth hormones?
(a) Charles Darwin
(b) Francis Darwin
(c) Both (a) and (b)
(d) None of these

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Problem 93

According to Charles Darwin, which plant would help in the discovery of PGH?
(a) Larkspur
(b) Buttercup
(c) Canary grass
(d) All of these

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Problem 94

Coleoptiles responded to
(a) Light
(b) Water
(c) Touch
(d) All of these

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Problem 95

As a response to stimuli the coleoptiles caused
(a) Bending
(b) Flowering
(c) Budding
(d) All of these

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Problem 96

Auxins are discovered by
(a) Charles Darwin
(b) Francis Darwin
(c) F. W. Went
(d) Both (a) and (b)

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Problem 97

Gibberella fujikuroi causes what disease in rice plants?
(a) Foolish seeding
(b) Bikaner
(c) Both (a) and (b)
(d) None of these

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Problem 98

Who repotted that the symptoms reappeared in uninfected plants treated with sterile filtrate of giberella fungus?
(a) E. Kurosawa
(b) F. Skoog
(c) Both (a) and
(b) (d) None of these

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Problem 99

Callus from which plant was observed by miller?
(a) Tomato
(b) Tobacco
(c) Rice plant
(d) None of these

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Problem 100

Addition of what to auxins in nutrients medium causes proliferation of callus?
(a) DNA
(b) Yeast extract
(c) Coconut milk
(d) All of these

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Problem 101

Who crystallized cytokinin?
(a) Skoog and miller
(b) Charles Darwin
(c) Both (a) and (b)
(d) F. W. Went

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Problem 102

Skoog and miller termed cytokinin as
(a) Cytokinesis
(b) Kinetin
(c) Both (a) and (b)
(d) None of these

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Problem 103

Which three different kinds of inhibitors were found in mid-1960s?
(a) Inhibitor-A, Abscission-II and dormin
(b) Inhibitor-B, Abscission-II and dormin
(c) Inhibitor-A, Abscission-III and dormin
(d) Inhibitor-B, Abscission-III and dormin

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Problem 104

All individually found inhibitors in mid- 1960 s were later named as
(a) Gibberellic acid
(b) Auxin
(c) Abscisic acid
(d) None of these

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Problem 105

The volatile substance causing ripening of unripened bananas?
(a) Abscisic acid
(b) Auxin
(c) Ethylene
(d) Terpenes

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Problem 106

The only gaseous PGR is
(a) IBA
(b) Kinetin
(c) Terpenes
(d) Ethylene

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Problem 107

The Greek meaning of 'Auxein' is
(a) To flower
(b) To seed
(c) To grow
(d) To enlarge

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Problem 108

Auxin was first isolated from
(a) Frog's wine
(b) Zeatin
(c) Human wine
(d) None of these

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Problem 109

The name 'Auxin' was given to which chemical?
(a) Indole-3-acetic acid
(b) Indole-6-acetic acid
(c) Indole-3-butyric acid
(d) Indole-6-butyric acid

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Problem 110

How many of the following auxins are obtained from plants? IAA, IBA, NAA, 2, 4-D
(a) 1
(b) 2
(c) 3
(d) 4

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Problem 111

NAA stands for
(a) Nitroacetic acid
(b) Nitro aceto acetate
(c) Naphthaleneacetic acid
(d) Naphthaloaceto acetic acid

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Problem 112

$2,4-\mathrm{D}$ stands for
(a) $2,4-$ Dichlorophenoxy acetate
(b) $2,4-$ Dextrophenoxy acetate
(c) 2, 4-Diphosphenoxy acetate
(d) 2,4 -Dichloromethoxy acetate

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Problem 113

Synthetic auxins are extesively used in
(a) Agriculture
(b) Horticulture
(c) Both (a) and (B)
(d) None of these

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Problem 114

Natural auxins are extensively used in
(a) Agriculture
(b) Horticulture
(c) Both (a) and (B)
(d) None of these

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Problem 115

Which effect of auxin is applied worldwide for plant propagation?
(a) Apical dominance
(b) Herbicidal action
(c) Initiate rooting in stem cutting
(d) None of these

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Problem 116

Auxins promote flowering in
(a) Tomatoes
(b) Pineapples
(c) Oranges
(d) None of these

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Problem 117

What prevents the fruit and leaf to drop in early?
(a) $\mathrm{ABA}$
(b) IAA
(c) NAA
(d) Both (b) and (c)

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Numerade Educator

Problem 118

What promotes the abscission of older mature leaf?
(a) Abscisic acid
(b) Auxin
(c) Ethylene
(d) Cytokinins

Asma Venkitta

Numerade Educator

Problem 119

In most of the higher plants, the growing apical bud inhibits the growth of lateral bud. This phenomena is called
(a) Apical tolerance
(b) Axial intolerance
(c) Apical ordinance
(d) Apical dominance

Asma Venkitta

Numerade Educator

Problem 120

What can help removing apical dominance?
(a) Removal of shoot tips
(b) Provide plants with a lot of auxin
(c) Both (a) and (B)
(d) None of these

Asma Venkitta

Numerade Educator

Problem 120

Assertion: Auxins used for plant propagation. Reason: They help to initiate rooting in stem cuttings.

Parvati Devi

Numerade Educator

Problem 121

The process of removal of shoot tip to avoid apical dominance is called
(a) Autotomy
(b) Decapitation
(c) Both (a) and (B)
(d) Capitation

Asma Venkitta

Numerade Educator

Problem 122

Decapitation is widely used for
(a) Tea plantation
(b) Hedge making
(c) Both (a) and (B)
(d) None of these

Asma Venkitta

Numerade Educator

Problem 123

Which of the following PGR can induce parthenocarpy?
(a) IBA
(b) $2,4-\mathrm{D}$
(c) Terpenes
(d) Kinetin

Asma Venkitta

Numerade Educator

Problem 124

Auxins induce parthenocarpy in which plants?
(a) Tomato
(b) Pineapple
(c) Apple
(d) All of these

Asma Venkitta

Numerade Educator

Problem 125

Which of the following PGR is widely used as herbicide?
(a) Auxin
(b) Gibberellic acid
(c) Cytokinins
(d) All of these

Asma Venkitta

Numerade Educator

Problem 126

Which of the following PGR is widely used to kill dicotyledonous weeds?
(a) IAA
(b) NAA
(c) $2,4-\mathrm{D}$
(d) $\mathrm{ABA}$

Asma Venkitta

Numerade Educator

Problem 127

$2,4-\mathrm{D}$ does not show herbicidal action on
(a) Chicory led ones
(b) Monocotyledonous
(c) Mature dicotyledonous
(d) Mature monocotyledonous

Asma Venkitta

Numerade Educator

Problem 128

Auxin $2,4-\mathrm{D}$ is used for what?
(a) To remove weeds from farms by formers
(b) To remove weeds from lawn by gardeners
(c) To induce flowering in horticulture
(d) All of these

Asma Venkitta

Numerade Educator

Problem 129

Auxin helps in what?
(a) Controlling phloem differentiation
(b) Controlling xylem differentiation
(c) Cell division
(d) Both (b) and (c)

Asma Venkitta

Numerade Educator

Problem 130

How many varieties of gibberellins reported from widely different variety of organisms?
(a) 100
(b) 120
(c) 145
(d) 140

Asma Venkitta

Numerade Educator

Problem 131

Different types of gibberellins is reported from what kind of organisms?
(a) Fungi
(b) Higher plants
(c) Both (a) and (b)
(d) None of these

Asma Venkitta

Numerade Educator

Problem 132

Which of the following was first reported gibberellins to be discovered?
(a) $\mathrm{GA}_{1}$
(b) $\mathrm{GA}_{2}$
(c) GA $_{3}$
(d) $\mathrm{GA}_{4}$

Asma Venkitta

Numerade Educator

Problem 133

What is the chemical natural of all the gas?
(a) Basic
(b) Acidic
(c) Neutral
(d) Slightly basic

Asma Venkitta

Numerade Educator

Problem 134

Gibberellins bring about what kind of change in plants?
(a) Morphological
(b) Physiological
(c) Genetical
(d) None of these

Asma Venkitta

Numerade Educator

Problem 135

Which ability of gibberellins is used to increase the length of grape stalks?
(a) Ability to increase apically
(b) Ability to increase in length of axis
(c) Ability to avoid apical dominance
(d) All of these

Asma Venkitta

Numerade Educator

Problem 136

How does gibberellins not change the quality of an apple?
(a) Make it sweeter
(b) Elongate it in size
(c) Improve its shape
(d) All of these

Asma Venkitta

Numerade Educator

Problem 137

How can gibberellins help to extend the market period?
(a) It delays senescence
(b) Increases ripening period
(c) Increases flowering time
(d) All of these

Asma Venkitta

Numerade Educator

Problem 138

In the form of sugar, sugarcane stores what?
(a) Proteins
(b) Carbohydrates
(c) Glycoproteins
(d) None of these

Asma Venkitta

Numerade Educator

Problem 139

On spraying gibberellins on sugarcane crops what major change will it bring?
(a) Increase sweetness
(b) Increase length of stem
(c) Increase root strength
(d) All of these

Asma Venkitta

Numerade Educator

Problem 140

Spraying of gibberellins over sugarcane can increase the yield by how much?
(a) 20 tonnes/acre
(b) $20 \mathrm{~kg} /$ acre
(c) 20 quintet/acre
(d) None of these

Asma Venkitta

Numerade Educator

Problem 141

What change does it bring in juvenile conifers when sprayed with gas?
(a) Hastens maturity period
(b) Hastens germination period
(c) Hastens dormancy period
(d) None of these

Asma Venkitta

Numerade Educator

Problem 142

Spraying of gas on juvenile conifers causes
(a) Early flowering
(b) Early germination
(c) Early seed production
(d) All of these

Asma Venkitta

Numerade Educator

Problem 143

Cytokinins have specific effects on
(a) Cytokinosis
(b) cytokinesis
(c) Cytoketosis
(d) Cytolysis

Asma Venkitta

Numerade Educator

Problem 144

In what form the cytokinins were discovered?
(a) Terpenes
(b) Toluenes
(c) Kinetin
(d) None of these

Asma Venkitta

Numerade Educator

Problem 145

Gibberellins promotes bolting in which plants?
(a) Beet
(b) Cabbage
(c) Both (a) and (b)
(d) None of these

Asma Venkitta

Numerade Educator

Problem 146

Kinetin is
(a) Cytokinins
(b) Modified form of adenine
(c) Purine
(d) All of these

Asma Venkitta

Numerade Educator

Problem 147

Kinetin was first discovered from
(a) Corn kernels
(b) Autoclaved herring sperm DNA
(c) Coconut milk
(d) All of these

Asma Venkitta

Numerade Educator

Problem 148

Naturally kinetin occurs in
(a) Coconut milk
(b) Pineapple
(c) Corn
(d) None of these

Asma Venkitta

Numerade Educator

Problem 149

The naturally available cytokinin like substance is
(a) Kinetin
(b) Zeatin
(c) Both
(a) and (b)
(d) None of these

Asma Venkitta

Numerade Educator

Problem 150

Zeatin was isolated from what?
(a) Corn kernels
(b) Coconut milk
(c) Both (a) and (b)
(d) None of these

Asma Venkitta

Numerade Educator

Problem 151

Where are natural cytokinins synthesized?
(a) Areas of rapid cell division
(b) Areas undergoing differentiation
(c) Both (a) and (b)
(d) None of these

Vishnu P

Numerade Educator

Problem 152

How many of the following PGRs help to overcome apical dominance? Auxins, Gibberellins, Cytokinins, Ethylene
(a) 1
(b) 2
(c) 3
(d) 4

Vishnu P

Numerade Educator

Problem 153

How many of the following PGRs help in delay of senescence? Auxins, Gibberellins, Cytokinins, Ethylene
(a) 1
(b) 2
(c) 3
(d) 4

Vishnu P

Numerade Educator

Problem 154

A plant tissue is undergoing senescence, which PGR would be found in it?
(a) Auxins
(b) Gibberellins
(c) Cytokinins
(d) Ethylene

Anand Jangid

Numerade Educator

Problem 155

Large amounts of ethylene is synthesized in
(a) Ripening fruit
(b) Newly grown leaf
(c) Apex
(d) Axial bud

Vishnu P

Numerade Educator

Problem 156

What are the influences of ethylene on plants?
(a) Horizontal growth of seedlings
(b) Swelling of the axis
(c) Apical hook formation in dicot seedling
(d) All of these

Vishnu P

Numerade Educator

Problem 157

What is the of effect of ethylene on plant organs, especially leaves and flowers?
(a) Promotes abscission
(b) Promotes senescence
(c) Both (a) and (b)
(d) None of these

Vishnu P

Numerade Educator

Problem 158

What is the effect of ethylene on ripening fruit?
(a) Increases rate of growth
(b) Increase in rate of respiration
(c) Both (a) and (b)
(d) None of these

Vishnu P

Numerade Educator

Problem 159

Rise in the rate of respiration is called
(a) Respiratory climax
(b) Respiratory rise
(c) Respiratory climactic
(d) None of these

Vishnu P

Numerade Educator

Problem 160

Which of the following PGR is used to break seed and bud dormancy?
(a) Auxins
(b) Gibberellins
(c) Cytokinins
(d) Ethylene

Vishnu P

Numerade Educator

Problem 161

Ethylene initiates germination in which seed?
(a) Mustard
(b) Peanut
(c) Both (a) and (b)
(d) None of these

Vishnu P

Numerade Educator

Problem 162

Sprouting of potato tubers is initiated by which of the following PGR?
(a) Cytokinin
(b) Ethylene
(c) Both (a) and (b)
(d) None of these

Vishnu P

Numerade Educator

Problem 163

How does ethylene help plants to increase their absorption surface?
(a) Promotes growth of root
(b) Promotes formation of root hair
(c) Both (a) and (b)
(d) None of these

Vishnu P

Numerade Educator

Problem 164

Ethylene is used to initiate flowering and for synchronizing fruit set in which fruit?
(a) Apple
(b) Pineapple
(c) Banana
(d) All of these

Vishnu P

Numerade Educator

Problem 165

Ethylene induces flowering in which fruit?
(a) Mango
(b) Apple
(c) Pineapple
(d) All of these

Vishnu P

Numerade Educator

Problem 166

Which of the following is the most widely used PGR in agriculture?
(a) IAA
(b) $\mathrm{ABA}$
(c) $\mathrm{GA}_{3}$
(d) Ethylene

Vishnu P

Numerade Educator

Problem 167

Which of the following is a characteristic of ethephon?
(a) Readily absorbed
(b) Transported within the plant
(c) Releases ethylene slowly
(d) All of these

Vishnu P

Numerade Educator

Problem 168

Ethephon hastens fruit ripening in
(a) Mango
(b) Tomato
(c) Apple
(d) Both (b) and (c)

Vishnu P

Numerade Educator

Problem 169

Ethephon accelerates abscission in flowers and fruits like
(a) Cherry
(b) Walnut
(c) Cotton
(d) All of these

Vishnu P

Numerade Educator

Problem 170

How does ethephon increase the yield of cucumber?
(a) Promotes senescence
(b) Promotes female flowers
(c) Promotes male flowers
(d) Both (a) and (b)

Vishnu P

Numerade Educator

Problem 171

For which role ABA was discovered?
(a) Abscission
(b) Dormancy
(c) Both (a) and (b)
(d) Ripening fruits

Vishnu P

Numerade Educator

Problem 172

What are the actions of ABA?
(a) General plant growth inhibitor
(b) Inhibitor of plant metabolism
(c) Stimulates the closure of stomata in epidermis
(d) All of these

Vishnu P

Numerade Educator

Problem 173

Why is ABA called stress hormone?
(a) Removes various stresses from plant
(b) Increase tolerance of plant to various kind of stresses
(c) Both (a) and (b)
(d) None of these

Vishnu P

Numerade Educator

Problem 174

ABA plays an important role in all except
(a) Seed development
(b) Maturation
(c) Dormancy
(d) Germination

Vishnu P

Numerade Educator

Problem 175

What is/are the factors that depicts unfavorable growth of seeds?
(a) Desiccation
(b) Air
(c) Carbon dioxide
(d) All of these

Vishnu P

Numerade Educator

Problem 176

ABA is antagonist to
(a) IBA
(b) IAA
(c) $\mathrm{GA}_{2}$
(d) All of these

Vishnu P

Numerade Educator

Problem 177

All are types of roles played by PGR except
(a) Individualistic
(b) Synergistic
(c) Both (a) and (b)
(d) None of these

Vishnu P

Numerade Educator

Problem 178

Which of the following events are controlled by extrinsic factors via PGR?
(a) Vernalisation
(b) Flowering
(c) Dormancy
(d) All of these

Vishnu P

Numerade Educator

Problem 179

All are extrinsic factors for growth and development except
(a) Temperature
(b) Light
(c) Both (a) and
(b) (d) Nutrition

Vishnu P

Numerade Educator

Problem 180

What kind of plants require the exposure to light for a period exceeding a well defined critical duration?
(a) Short day plants
(b) Day-neutral plants
(c) Long day plants
(d) None of these

Vishnu P

Numerade Educator

Problem 181

What kind of plants require the exposure to light for a period less than critical duration?
(a) Short day plants
(b) Day-neutral plants
(c) Long day plants
(d) None of these

Vishnu P

Numerade Educator

Problem 182

Plants with no such correlation between exposure to light duration and induction of flower response are called
(a) Long day plant
(b) Day-neutral plants
(c) Short day plant
(d) None of these

Vishnu P

Numerade Educator

Problem 183

What is more important of these?
(a) Light period
(b) Dark period
(c) Both (a) and (b)
(d) None of these

Vishnu P

Numerade Educator

Problem 184

According to Hypothesis, which substances are responsible for photoperiodism?
(a) Hormonal substance
(b) Abscisic acid
(c) Gibberellins
(d) All of these

Vishnu P

Numerade Educator

Problem 185

When flowering is either quantitatively or qualitatively dependent or exposure to low temperature it is called $\quad$ phenomenon.
(a) Photoperiodism
(b) Thermoperiodism
(c) Vernalization
(d) Dormancy

Vishnu P

Numerade Educator

Problem 186

Which of the plants don't have winter and spring varieties?
(a) Wheat
(b) Rice
(c) Barley
(d) Rye

Vishnu P

Numerade Educator

Problem 187

When are winter varieties planted?
(a) Spring
(b) Winter
(c) Autumn
(d) All of these

Vishnu P

Numerade Educator

Problem 188

When is the harvesting of winter varieties done?
(a) Spring
(b) Winter
(c) Mid-summer
(d) Autumn

Vishnu P

Numerade Educator

Problem 189

Biennials are what kind of plants?
(a) Dicarpous
(b) Monocarpic
(c) Polycarpic
(d) None of these

Vishnu P

Numerade Educator

Problem 190

Which of the following are examples of common biennials?
(a) Carrot
(b) Cabbages
(c) Sugarbeet
(d) All

Vishnu P

Numerade Educator

Problem 191

Cold treatment to biennial plants will stimulate what kind of response?
(a) Photo hastens
(b) Photoropism
(c) Photoperiodism
(d) All

Vishnu P

Numerade Educator

Problem 192

Assertion: Plant retains the capacity for unlimited growth throughout their life. Reason: This ability of the plants is due to the presence of meristem at certain location of body.

Parvati Devi

Numerade Educator

Problem 193

Assertion: A sigmoid curve is a characterstic of living organism growing in a natural environment. Reason: Sigmoid curve is an S shaped curve.

Parvati Devi

Numerade Educator

Problem 194

Assertion: Auxin induces parthenocarpy in tomatoes. Reason: $2,4-\mathrm{D}$ is used as herbicides.

Parvati Devi

Numerade Educator

Problem 195

Assertion: GA increase the yield in sugarcane. Reason: GA causes increase in length of sugarcane stem.

Parvati Devi

Numerade Educator

Problem 196

Assertion: Cytokinin delays the leaf senescence. Reason: Cytokinin promotes nutrient mobilization.

Parvati Devi

Numerade Educator

Problem 197

Assertion: ABA increases the tolerance of plant to various kinds of stresses. Reason: ABA stimulates the closure of stomata in the epidermis.

Parvati Devi

Numerade Educator

Problem 198

Assertion: Ethylene increases the yield in cucumber. Reason: Ethylene promotes female flower in cucumber.

Parvati Devi

Numerade Educator

Problem 199

Assertion: Ethylene increases the yield in cucumber. Reason: Ethylene promotes female flower in cucumber.

Parvati Devi

Numerade Educator

Problem 200

Assertion: The pigment which causes photoperiodic stimulus is called phytochrome. Reason: Chemically phytochrome is a starch and lipid.

Parvati Devi

Numerade Educator

Problem 201

Assertion: Floral initiation is done by hormonal substance. Reason: Hormonal substance is translocated from flowers to leaves.

Parvati Devi

Numerade Educator

Problem 202

Assertion: Vernalization refers specially to the promotion of flowering by a period of low temprature. Reason: Vernalization also seen in biennial plants.

Parvati Devi

Numerade Educator

Problem 203

Assertion: Auxins have been used extensively in agriculture and horticulture. Reason: They help to initiate rooting in stem cuttings.

Parvati Devi

Numerade Educator

Problem 204

Assertion: A plant hormone is a growth regulator. Reason: Growth regulators promote or inhibit the growth.

Parvati Devi

Numerade Educator

Problem 205

Assertion: Expansion of a leaf is growth. Reason: It is irreversible process

Parvati Devi

Numerade Educator

Problem 206

Assertion: Plant posses open form of growth Reason: Plant has meristmetic tissues

Parvati Devi

Numerade Educator

Problem 207

Assertion: Growth in plant is measurable Reason: We can measure growth of pollen tube in terms of its length

Parvati Devi

Numerade Educator

Problem 208

Assertion: Secondary xylem is example of redifferentiated cells. Reason: Secondary xylem develops from dedifferentiated cells.

Parvati Devi

Numerade Educator

Problem 209

Assertion: Discovery of all 5 PGRs have been accidental Reason: PGRs are simple molecules of diverse chemical composition

Parvati Devi

Numerade Educator

Problem 211

Assertion: In tea plantation hedge making is occur by decapitation. Reason: Removal of apical bud usually results in the growth of lateral buds.

Parvati Devi

Numerade Educator

Problem 212

Assertion: $\mathrm{GA}_{3}$ is used to speed up the melting process in brewing industries Reason: $\mathrm{GA}_{3}$ leads to synthesis of $\alpha$ -amylase hydrolysing enzyme which is responsible for partial hydrolysis of starch.

Parvati Devi

Numerade Educator

Problem 213

Assertion: Ripened banana inhibit the ripening of stored unripe banana. Reason: Ripened banana release ethylene which inhibit ripening process

Parvati Devi

Numerade Educator

Problem 214

Assertion: Generally plant without leaf is unable to produce flower Reason: Leaves are site of perception of light for flowering

Parvati Devi

Numerade Educator

Problem 215

Assertion: ABA is known as stress hormone Reason: ABA increases the tolerance of plants to several kinds of stresses.

Parvati Devi

Numerade Educator

Problem 216

Assertion: $2,4 \mathrm{D}$ is selective weedicide Reason: $2,4 \mathrm{D}$ is widely used to kill dicotyledonous weeds and doesn't affect mature monocotyledonous plant.

Parvati Devi

Numerade Educator

Problem 217

Assertion: GAs leads to early seed production in conifers Reason: GAs hastens maturity period in juvenile conifers.

Parvati Devi

Numerade Educator

Problem 218

Assertion: Ethylene helps the plants to increase their surface area for absorption. Reason: Ethylene promotes root growth and root hair formation.

Parvati Devi

Numerade Educator