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

Light Dependent Reactions in Photosynthesis Answers

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1
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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
2
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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
3

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.
4

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
5

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
6

Which is the best description of photophosphorylation?

A
the absorption of light energy by chlorophyll
B
the conversion of light energy to chemical energy
C
the removal of a phosphate group from a molecule
D
the conversion of ADP to ATP using light energy
7

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.
8

Which is the site of the light-dependent reactions of photosynthesis?

A
mitochondria
B
stomata
C
stroma
D
thylakoids
9

Along with plants and algae, in which organisms can photosynthesis occur?

A
some bacteria
B
all fungi
C
some animals
D
all protists
10

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.
11

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

c
chemical
m
mechanical
t
thermal
e
electrical
12

1. Light energy excites electrons.2. Water molecules are split.3. NADPH is formed.

1
1. photosystem II2. photosystem I3. photosystem I
1
1. photosystem II2. photosystem II3. photosystem I
1
1. photosystem I2. photosystem I3. photosystem II
1
1. photosystem I2. photosystem II3. photosystem II
13

How is ADP converted to ATP?

b
by the addition of one adenosine molecule
b
by the addition of one phosphate group
b
by the removal of one adenosine molecule
b
by the removal of one phosphate group
14

What is the source of energy that drives photosynthesis?

s
sunlight
h
hydrogen ions
e
electrons
o
oxygen
15

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

T
The leaves are green.
T
The flowers are breathtaking.
T
The plant is producing oxygen.
T
The bush has thorns.

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