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

Light Dependent Reactions in Photosynthesis Answers

14 verified answers
1
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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
2
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Which is the site of the light-dependent reactions of photosynthesis?

A
mitochondria
B
stomata
C
stroma
D
thylakoids
3

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.
4

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.
5

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
6

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.
7

Consider the following events of photosynthesis.1. Light energy excites electrons.2. Water molecules are split.3. NADPH is formed.In which locations do each of these events occur?

A
1. photosystem II2. photosystem I3. photosystem I
B
1. photosystem II2. photosystem II3. photosystem I
C
1. photosystem I2. photosystem I3. photosystem II
D
1. photosystem I2. photosystem II3. photosystem II
8

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
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 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.
11

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
12

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
13

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
14

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.
15

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.
16

How is ADP converted to ATP?

A
by the addition of one adenosine molecule
B
by the addition of one phosphate group
C
by the removal of one adenosine molecule
D
by the removal of one phosphate group
17

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
18

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.
19

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

A
chemical
B
mechanical
C
thermal
D
electrical
20

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

A
mitochondria
B
stomata
C
stroma
D
thylakoids

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