AnswersNHS Biology CR Q2 - 1819ATP

Light Independent Reactions in Photosynthesis Answers

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1
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Which compound is a metabolic intermediate of the light-independent reactions in photosynthesis?

A
ATP
B
PGA
C
RuBP
D
NADPH
2
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What is one role of ATP in the light-independent reaction of photosynthesis?

A
ATP supplies the energy to produce glucose and other carbohydrates.
B
ATP is produced when water molecules are split and chlorophyll electrons are excited.
C
ATP supplies the energy to split water molecules.
D
ATP produces CO2 and O2 molecules.
3

Which is the best hypothesis for the scientific question “How does light intensity affect the rate of photosynthesis?”

A
Light intensity, CO2 concentration, and temperature are factors that determine the rate of photosynthesis.
B
Light intensity has no effect on the rate of photosynthesis.
C
If the distance between the source of light and the plant is increased, the rate of photosynthesis will decrease.
D
Light intensity has an impact on the rate of photosynthesis.
4

How do ATP and NADPH connect light-dependent and light-independent reactions in photosynthesis?

A
ATP and NADPH are produced in both reactions.
B
ATP and NADPH are used in both reactions.
C
ATP and NADPH are produced in the light-dependent reactions and used in the light-independent reactions.
D
ATP and NADPH are produced in the light-independent reactions and used in the light-dependent reactions.
5

Which process occurs during the light-dependent reactions in photosynthesis?

A
Water molecules are split.
B
Carbon fixation occurs.
C
PGA is reduced.
D
RuBP is regenerated.
6

What is required for both the light-dependent and light-independent reactions to proceed?

A
energy
B
CO2
C
water
D
ATP and NADPH
7

In which type of environment are plants most likely to use a C4 pathway of carbon fixation?

A
cold and wet
B
cold and dry
C
hot and wet
D
hot and dry
8

What is the source of the carbon dioxide that is used in photosynthesis?

A
sunlight
B
the soil
C
the atmosphere
D
the plant
9

Which is required for the light-dependent reactions in photosynthesis to occur?

A
H2O
B
ATP
C
NADPH
D
CO2
10

During reduction, PGA reacts with ATP and NADPH. What does ATP contribute to the reaction?

A
carbon
B
hydrogen ions
C
electrons
D
phosphate group

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