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

Light Dependent Reactions in Photosynthesis Answers

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The diagram summarizes the light-dependent reactions of photosynthesis. What is the input of the light-dependent reactions, labeled X?

Question illustration
A
CO2, H2O, O2, and light
B
CO2, H2O, and light
C
CO2 and H2O
D
H2O and light
2
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Which is considered a scientific observation?

A
Akon explained that cells need energy which is why animals eat food.
B
Jacinta correlated that high sweat levels were due to a high heart rate.
C
Mahir noticed the plants he watered grew taller than those with less water.
D
Kai decided plants are green because of the chlorophyll used to make food.
3

Which best lists the end products of the light-dependent reactions of photosynthesis?

A
ATP and NADPH
B
CO2 and H2O
C
ATP, NADPH, and O2
D
C6H12O6 and O2
4

Which best describes how the photosystems are used in the light-dependent reactions?

A
photosystem I is used first then photosystem II
B
photosystem II is used first then photosystem I
C
Both processes are used at the same time.
D
Both processes are used during the light-independent reactions.
5

Through which conversion is energy released?

A
ADP to ATP
B
ATP to ADP
C
NADP+ to NADPH
D
CO2 and H2O to C6H12O6 and O2
6

Which event occurs in photosystem I?

A
Water molecules are broken apart.
B
Light energy excites electrons.
C
Oxygen is released as waste.
D
Electrons are transferred to ferredoxin.
7

Which is the correct chemical equation for photosynthesis?

A
6CO2 + 6H2O ® C6H12O6 + 6O2
B
C6H12O6 + 6O2 ® 6CO2 + 6H2O
C
3CO2 + 3H2O + 3O2® C6H12O6
D
6O2 + 6H2O ® C6H12O6 + 6CO2
8

Jasmine and Marcus are at the park, and Jasmine makes the following statements. Which of them is an inference?

A
The leaves are green.
B
The flowers are breathtaking.
C
The plant is producing oxygen.
D
The bush has thorns.
9

Which series lists the structural components of the light-dependent reactions in order, from smallest to largest?

A
chlorophyll ® thylakoid ® photosystem I ® photosystem II
B
chloroplast ® photosystem II ® photosystem I ® thylakoid
C
chlorophyll ® thylakoid ® chloroplast
D
chloroplast ® chlorophyll® thylakoid
10

During the light-dependent reaction of photosynthesis, light energy is converted into which form of energy?

A
chemical
B
mechanical
C
thermal
D
electrical

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