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Biology Today and Tomorrow with Physiology

Cecie Starr, Christine Evers, Lisa Starr

Chapter 5

Photosynthesis - all with Video Answers

Educators

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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 are heterotrophs?

SM
Sydney Mastalerz
Numerade Educator
00:49

Problem 2

Plants use____ as an energy source to drive photosynthesis.
a. sunlight
b. sugars
c. $\mathrm{O}_{2}$
d. $\mathrm{CO}_{2}$

SM
Sydney Mastalerz
Numerade Educator
00:51

Problem 3

The carbon that land plants use for photosynthesis comes from _____.
a. glucose
b. the atmosphere
c. water
d. soil

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Sydney Mastalerz
Numerade Educator
01:23

Problem 4

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
01:29

Problem 5

Closed stomata ____ .
a. limit gas exchange
b. permit water loss
c. prevent photosynthesis
d. minimize photorespiration

SM
Sydney Mastalerz
Numerade Educator
01:22

Problem 6

Using multiple pigments allows autotrophs to ___
a. be multicolored in fall
b. live where there is no water
c. fix carbon more efficiently
d. use more wavelengths of light for photosynthesis

SM
Sydney Mastalerz
Numerade Educator
01:07

Problem 7

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

SM
Sydney Mastalerz
Numerade Educator
01:03

Problem 8

In the light-dependent reactions, ____
a. carbon dioxide is fixed
b. electrons flow through electron transfer chains
c. $\mathrm{CO}_{2}$ accepts electrons

SM
Sydney Mastalerz
Numerade Educator
01:31

Problem 9

When a photosystem absorbs light, _____ .
a. water forms and exits the cell
b. electrons are transferred to ATP
c. its special pair releases electrons
d. rubisco fixes carbon

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Sydney Mastalerz
Numerade Educator
01:28

Problem 10

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

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Sydney Mastalerz
Numerade Educator
01:10

Problem 11

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

SM
Sydney Mastalerz
Numerade Educator
01:08

Problem 12

In the light-independent reactions, ____
a. carbon is fixed
b. electrons flow through electron transfer chains
c. ATP forms

SM
Sydney Mastalerz
Numerade Educator
01:07

Problem 13

The Calvin-Benson cycle starts with ____
a. the absorption of light energy
b. carbon fixation
c. the release of electrons from photosystem II
d. NADP $^{+}$ formation

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Sydney Mastalerz
Numerade Educator
01:16

Problem 14

In many plants, photorespiration caused by ___ during the day can make sugar production
a. photosynthesis running
b. water availability
c. stomata closing
d. carbon fixation

SM
Sydney Mastalerz
Numerade Educator
02:37

Problem 15

Match the term with the best description.
$$ \text {PGAL } \quad \quad \text {a. self-feeder} $$
$$ \text {autotroph} \quad \quad \text {b. site of photosystems} $$
$$ \text {heterotroph} \quad \quad \text {c. Calvin-Benson cycle product} $$
$$ \text {pigment} \quad \quad \text {d. consumer} $$
$$ \text {carbon dioxide} \quad \quad \text {e. carbon-fixing enzyme} $$
$$ \text {rubisco} \quad \quad \text {f. like an antenna} $$
$$ \text {thylakoid membrane } \quad \quad \text {g. big in the atmosphere} $$
$$ \text {wavelength} \quad \quad \text {h. part of a photosystem} $$
$$ \text {special pair } \quad \quad \text {i. related to energy} $$

SM
Sydney Mastalerz
Numerade Educator