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Biology : The Unity and Diversity of Life

Cecie Starr, Christine A. Evers; Lisa Starr

Chapter 6

Where It Starts-Photosynthesis - all with Video Answers

Educators

Chapter Questions

01:12

Problem 1

A cat eats a bird, which ate a caterpillar that chewed on a weed. Which organisms are autotrophs? Which ones are heterotrophs?

Prashant Bana
Prashant Bana
Numerade Educator
01:01

Problem 2

Photosynthesis runs on the energy of _______.
a. light
b. hydrogen ions
c. $\mathrm{O}_{2}$
d. $\mathrm{CO}_{2}$

Charles Machakwa
Charles Machakwa
Numerade Educator
00:46

Problem 3

Most of the carbon dioxide that plants use for photosynthesis comes from ________.
a. glucose
b. the atmosphere
c. rainwater
d. photolysis

Aditya Sood
Aditya Sood
Numerade Educator
00:37

Problem 4

Which of the following statements is incorrect?
a. Pigments absorb light of certain wavelengths only.
b. Some accessory pigments are antioxidants.
c. Chlorophyll is green because it absorbs green light.

Aditya Sood
Aditya Sood
Numerade Educator
01:23

Problem 5

In cyanobacteria and photosynthetic eukaryotes, the light-dependent reactions proceed in/at the ____ .
a. thylakoid membrane
b. plasma membrane
c. stroma
d. cytoplasm

SM
Sydney Mastalerz
Numerade Educator
00:50

Problem 6

When a photosystem absorbs light, _______.
a. sugar phosphates are produced
b. electrons are transferred to ATP
c. RuBP accepts electrons
d. its special pair emits electrons

Charles Machakwa
Charles Machakwa
Numerade Educator
01:02

Problem 7

In the light-dependent reactions, _________.
a. carbon dioxide is fixed
b. ATP forms
c. $\mathrm{CO}_{2}$ accepts electrons
d. sugars form

Aditya Sood
Aditya Sood
Numerade Educator
01:10

Problem 8

In the light-dependent reactions, what accumulates in the thylakoid compartment of chloroplasts?
a. sugars
b. hydrogen ions
c. $\mathrm{O}_{2}$
d. $\mathrm{CO}_{2}$

SM
Sydney Mastalerz
Numerade Educator
01:28

Problem 9

The atoms in oxygen molecules released during photosynthesis come from ______.
a. sugars
b. water
c. $\mathrm{O}_{2}$
d. $\mathrm{CO}_{2}$

SM
Sydney Mastalerz
Numerade Educator
00:33

Problem 10

In chloroplasts, the light-independent reactions proceed at/in the _________.
a. thylakoid membrane
b. plasma membrane
c. stroma
d. cytoplasm

Aditya Sood
Aditya Sood
Numerade Educator
00:46

Problem 11

The Calvin-Benson cycle starts with _________.
a. the absorption of photon energy
b. carbon fixation
c. the release of electrons from photosystem II
d. NADP+ formation

Aditya Sood
Aditya Sood
Numerade Educator
00:51

Problem 12

Which of the following substances does not participate in the Calvin-Benson cycle?
a. ATP
b. NADPH
c. RuBP
d. PGAL
e. $\mathrm{O}_{2}$
f. $ \mathrm{CO}_{2}$

Aditya Sood
Aditya Sood
Numerade Educator
00:48

Problem 13

Closed stomata __________.
a. limit gas exchange
b. permit water loss
c. prevent photosynthesis
d. absorb light

Aditya Sood
Aditya Sood
Numerade Educator
01:43

Problem 14

In C3 plants, _______ makes sugar production inefficient when stomata close during the day.
a. photosynthesis
b. photolysis
c. photorespiration
d. carbon fixation

Charles Machakwa
Charles Machakwa
Numerade Educator
00:48

Problem 15

Match each term with the best description.
______ $\mathrm{PGAL}$
______ $\mathrm{CO}_{2}$ fixation
______ photolysis
______ ATP forms; NADPH does not
______ photorespiration
______ photosynthesis
______ pigment
______ autotroph
a. absorbs light
b. converts light to chemical energy
c. self-feeder
d. electrons cycle back to photosystem I
e. problem in C3 plants
f. Calvin-Benson cycle product
g. water molecules split
h. rubisco function

Mishal Gul
Mishal Gul
Numerade Educator