Georgia Science Grade 7

Chapter 11: Plant Processes

CRCT Practice

1
Which statement correctly describes the leaf epidermis?
A)This is an inner cell layer of the leaf.
B)This layer is nearly transparent.
C)Food is made in this layer.
D)Sunlight cannot penetrate this layer.
2
What happens when a plant is losing too much water?
A)Stomata close.
B)Guard cells swell.
C)Stomata open.
D)Respiration increases.
3
What controls the plant growth response shown?

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A)auxin
B)gravity
C)abscisic acid
D)length of darkness
4
What chemical absorbs light energy, which plants use in photosynthesis?
A)oxygen
B)hydrogen
C)chlorophyll
D)glucose
5
What type of response is displayed by this plant?

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A)negative phototropism
B)positive gravitropism
C)positive phototropism
D)negative gravitropism
6
What plant hormone is responsible for the response shown here?

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A)abscisic acid
B)auxin
C)a gibberellin
D)a cytokinin
7
In which plant cell structure does cellular respiration take place?
A)nucleus
B)mitochondrion
C)vacuole
D)cell wall
8
Which is NOT produced through cellular respiration?
A)glucose
B)energy
C)water
D)carbon dioxide
9
Which statement is TRUE?
A)Changes in number of hours of darkness have no effect on plant growth.
B)Plants that need less than 10 to 12 hours of darkness to flower are called short-day plants.
C)Plants that need 12 or more hours of darkness to flower are called short-day plants.
D)Very few plants rely on a specific length of darkness to flower.
10
Based on this equation, what is the main food of plant cells?

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A)CO2
B)H2O
C)C6H12O6
D)O2
11
Many people who save poinsettia plants from December cannot get them to flower the following December.Why?
A)Poinsettias were not exposed to 24 hours of light.
B)Poinsettias were not exposed to 24 hours of darkness.
C)Poinsettias were not exposed to 10 hours of darkness and 14 hours of light.
D)Poinsettias were not exposed to 12 to 14 hours of uninterrupted darkness.
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