AnswersPA Human Anatomy Physiology A 2026-2027 SMITH ICThe Function of Organelles

The Process of Photosynthesis Answers

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1
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Which is the main light-absorbing pigment for photosynthesis?

A
carotene
B
chlorophyll
C
hemoglobin
D
anthocyanin
2
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Johannes wants to know whether soil, water, or both are needed for plant growth. He chooses to conduct experiments on a willow tree for five years to answer his question. How can his experimental methods be changed to improve his experiment?

A
He needs to ask scientists what they think.
B
He needs to conduct the experiment for a longer period.
C
He needs to use a larger sample size.
D
He needs to test more factors in the environment.
3

Which statement best describes what a thylakoid does during photosynthesis?

A
surrounds the grana and keeps them moist
B
enables the light-dependent reactions to occur
C
combines carbon dioxide and water to make sugar
D
helps the light-independent reactions to occur
4

Which of these statements is true about autotrophs, but not heterotrophs?

A
They use sugar and oxygen to make carbon dioxide and water.
B
They use chlorophyll and oxygen to make carbon dioxide and water.
C
They use sunlight, water, and carbon dioxide to make sugars.
D
They use sunlight, water, and oxygen to make chlorophyll.
5

Which statement summarizes a change that occurs during photosynthesis?

A
It converts visible light to high-energy gamma rays.
B
It converts carbon to oxygen.
C
It converts light energy to chemical energy.
D
It converts energy to mass.
6

In which situation would it be least likely for a scientist to revise her experimental methods?

A
if her results support her hypothesis
B
if her data do not support her hypothesis
C
if no conclusions can be drawn from the data
D
if results are the same after repeating the procedure
7

Consider the formula for glucose: C6H12O6. In the processes of photosynthesis, what supplies the hydrogen (H) used in the formation of glucose?

A
light energy
B
carbon dioxide
C
chlorophyll
D
water
8

Which statement best describes the relationship of photosynthesis and energy?

A
The process of photosynthesis is energy-storing because the process converts light energy into chemical energy, which is stored in the bonds of glucose.
B
The process of photosynthesis is energy-releasing because the process converts light energy into free energy that can be used for cell functions.
C
The process of photosynthesis is energy-conserving because no energy is used throughout the process of forming glucose and oxygen molecules.
D
The process of photosynthesis is energy-wasting because photosynthesis is an inefficient process that depletes the cell of energy stored in the bonds of glucose.
9

Which is an example of why the process of photosynthesis is important to life on Earth?

A
Grass uses photosynthesis to produce glucose, which is used within the grass for growth.
B
Fungi use photosynthesis to decompose dead and decaying plant matter.
C
Ectothermic animals use photosynthesis to convert sunlight into energy for cell functions.
D
Green plants use photosynthesis to remove oxygen gas from the atmosphere and replenish the earth’s carbon dioxide.
10

How are the products represented in the chemical equation for photosynthesis?

A
O2 + 6CO2
B
C6H12O6 + 6H2O
C
6CO2 + 6H2O
D
C6H12O6 + 6O2
11

Navah writes out the chemical equation for photosynthesis. She includes two reacting molecules to the left of the arrow and two resulting molecules to the right.What must be added to the chemical equation to more accurately represent photosynthesis?

A
light energy, above the arrow
B
chlorophyll, to the left of the arrow
C
enzymes, to the left of the arrow
D
ATP, above the arrow
12

What component of Earth’s atmosphere exists entirely as a result of photosynthesis?

A
oxygen gas
B
water vapor
C
nitrogen gas
D
carbon dioxide gas
13

Photosynthesis is important to living organisms because it is

A
the foundation of most food chains.
B
the source of nitrogen gas in the air.
C
how animals get carbon dioxide to breathe.
D
the process that occurs in most ecosystems.
14

How are the reactants represented in the chemical equation for photosynthesis?

A
6CO2 + O2
B
6CO2 + 6H2O
C
C6H12O6 + 6O2
D
C6H12O6 + 6H2O

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