AnswersEnvironmental Science B WHSGlobal Connection: Water Management and Katrina

Photosynthesis in Plants Answers

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1
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Which of the following is not necessary for a plant to carry out photosynthesis?

A
carbon dioxide
B
water
C
oxygen
D
sunlight
2
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Different types of plants use different types of carbon fixation as adaptations to varying conditions.

A
T
B
F
3

Which of the following statements about the dark reactions is true?

A
Dark reactions occur in the thylakoids of chloroplasts.
B
Light energy is converted to chemical energy during the dark reactions.
C
Carbon dioxide is converted to sugar using ATP and NADPH during the dark reactions.
D
All of the above
4

How does the carbon dioxide necessary for photosynthesis enter plants?

A
through their roots
B
through openings in the leaves called stomata
C
the plants produce their own complete supply
D
none of the above
5

Carbon fixation occurs during the light reactions.

A
T
B
F
6

Why is photosynthesis vital for life?

A
Photosynthesis helps maintain atmospheric levels of oxygen and carbon dioxide.
B
Photosynthesis is a direct means of energy production for many organisms.
C
Photosynthesis is an indirect means of energy production for many organisms.
D
All of the above
7

Photosynthesis is vital for maintaining levels of atmospheric oxygen.

A
T
B
F
8

What is the main difference between C3 and C4 carbon fixation?

A
In C3 carbon fixation, plant stomata are open during the day, while they are open at night for C4 carbon fixation.
B
C3 processes take place throughout the leaf, while C4 processes take place in the inner cells.
C
C3 carbon fixation is more common in areas with high light intensity than C4 carbon fixation.
D
C3 processes are more efficient than C4 processes in high temperatures.
9

C4 and CAM plants are _______.

A
adaptations to arid environments
B
adaptations to moist environments
C
more common than C3 plants
D
less efficient at water conservation than C3 plants
10

How is the process of carbon fixation in CAM plants different from the process in C3 and C4 plants?

A
CAM plants require a larger exchange of gases in the atmosphere than C3 and C4 plants.
B
CAM plants are better adapted for moist, low light areas than C3 and C4 plants.
C
CAM plants conserve water by allowing transpiration to occur at night rather than the day like it does with C3 and C4 plants.
D
All of the above
11

How are the dark reactions that occur in plants dependent on the light reactions?

A
The chemical energy used in the dark reactions is produced in the light reactions.
B
The light reactions produce the oxygen necessary for the dark reactions to proceed.
C
Light energy absorbed during the light reactions is used directly in the dark reactions.
D
During the light reactions, carbon dioxide is converted to sugars, which are used during the dark reactions.
12

Which of the following plant structures provides most of the water necessary for photosynthesis?

A
roots
B
leaves
C
chloroplasts
D
stomata
13

Which of the following is an output of photosynthesis?

A
oxygen
B
carbon dioxide
C
water
D
nutrients
14

Which of the following types of carbon fixation is least common for plants in arid locations?

A
C3
B
C4
C
CAM
D
none of the above
15

Which of the following types of carbon fixation is associated with plant stomata being open during the night?

A
C3
B
C4
C
CAM
D
all of the above
16

Dark reactions require energy to proceed, while light reactions do not.

A
T
B
F
17

The _______ in plants is directly responsible for absorbing light energy.

A
stroma
B
thylakoid
C
grana
D
chlorophyll

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