AnswersFL-2002040-MJ Comprehensive Science 1 CRCellular Interactions with the Environment

Photosynthesis Answers

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1
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Which is the energy source used to fuel photosynthesis?

A
sunlight
B
glucose
C
carbon dioxide
D
water
2
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Anton thinks that glucose is a reactant of photosynthesis, but his classmate Jamila disagrees. Who is correct, and why?

A
Anton is correct because glucose is a substance that is present before the chemical reaction of photosynthesis takes place.
B
Anton is correct because glucose is a substance that is formed from the chemical reaction of photosynthesis.
C
Jamila is correct because glucose is a product, not a reactant, of photosynthesis.
D
Jamila is correct because glucose is not involved in the chemical reaction of photosynthesis.
3

Li Ming thinks that chlorophyll is a reactant of photosynthesis, but her classmate Julian disagrees. Who is correct, and why?

A
Li Ming is correct because chlorophyll is a substance that is present before the chemical reaction of photosynthesis takes place.
B
Li Ming is correct because chlorophyll is a substance that is formed from the chemical reaction of photosynthesis.
C
Julian is correct because chlorophyll is a product, not a reactant, of photosynthesis.
D
Julian is correct because chlorophyll is neither used up nor formed in the chemical reaction of photosynthesis.
4

Which best describes the reactants and products of photosynthesis?

A
Reactants are formed inside the plant, and products are taken in from the environment by the plant.
B
Reactants are taken in from the environment by the plant, and products are formed inside the plant.
C
Reactants and products are formed inside the plant.
D
Reactants and products are taken in from the environment by the plant.
5

A scientist follows this procedure to test whether plants have been performing photosynthesis.Place Plant X in a dark closet and Plant Y on a sunny windowsill. Wait several days, then remove a leaf from each plant.Boil leaves in alcohol to remove the chlorophyll. Add a chemical indicator that detects sugars. (Dark purple = sugars are present; dark orange = sugars are not present)

A
Plant X: dark purplePlant Y: dark purple
B
Plant X: dark orangePlant Y: dark purple
C
Plant X: dark orangePlant Y: dark orange
D
Plant X: dark purplePlant Y: dark orange
6

Which best explains how photosynthesis is helpful to humans?

A
It reduces the amount of harmful rays released by the sun.
B
It increases the levels of carbon dioxide in the air.
C
It provides oxygen for humans to breathe.
D
It produces proteins, which humans can eat.
7

Sammy is taking notes to study for a test. He wrote out the steps that involve hydrogen during photosynthesis. The steps are shown, but they are not in the correct order.1 - Water is broken down into oxygen and hydrogen.2 - Glucose is broken down to be used by plants. 3 - Hydrogen combines with carbon dioxide to form glucose.4 - Hydrogen enters the plant as part of water.

A
4, 2, 1, 3
B
4, 1, 3, 2
C
4, 3, 1, 2
D
4, 2, 3, 1
8

Which describes the role of oxygen in photosynthesis?

A
It is a reactant, so it is released by the plant.
B
It is a product, so it is released by the plant.
C
It is a reactant, so it enters the plant.
D
It is a product, so it enters the plant.
9

Which substance is used by plants as a source of food?

A
water
B
glucose
C
oxygen
D
carbon dioxide
10

Where in an equation for photosynthesis does glucose belong?

A
on the left, because it is a product
B
on the left, because it is a reactant
C
on the right, because it is a product
D
on the right, because it is a reactant

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