Answers41111de1 ECAD Fall 2026 - Q2 - NM-Biology - S1Light Dependent Reactions in Photosynthesis

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 first step in the scientific method?

A
ask a question
B
conduct background research
C
construct a hypothesis
D
perform an experiment
4

Which is an important difference between light-dependent (L-D) and light-independent (L-IND) reactions in photosynthesis?

A
The L-D reactions need CO2 and light energy, and the L-IND reactions needs water and O2.
B
The L-D reactions require light energy and water, and the L-IND reactions require ATP, NADPH, and CO2.
C
The L-D reactions can only occur during daylight, and the L-IND reactions can only occur during the night.
D
The L-D reactions need water and CO2, and the L-IND reactions need CO2 and light.
5

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

A
H2O
B
ATP
C
NADPH
D
CO2
6

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

A
sunlight
B
the soil
C
the atmosphere
D
the plant
7

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.
8

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
9

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.
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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