Plant Responses

Question 1

Look at the image of a plant.

Revolt · Accepted Answer

D: thigmotropism and phototropism

Question 2

The diagram shows a bean plant growing in soil.

Revolt · Accepted Answer

A: X: Positive gravitropismY: Negative gravitropism

Question 3

Which statements describe hormones in plants? Select three options.Cutting stems can stimulate hormones to start lateral leaf growth. Some tropisms are controlled by hormones. Cells grow faster in areas where auxin is concentrated.Hormones help buds form and grow in the winter. Auxin is the only hormone involved in plant development.

Revolt · Accepted Answer

A: Cutting stems can stimulate hormones to start lateral leaf growth.; B: Some tropisms are controlled by hormones.; C: Cells grow faster in areas where auxin is concentrated.

Question 4

Sandra has a houseplant sitting on her kitchen windowsill, where it receives a lot of sunlight.What will most likely be the plant’s pattern of growth?

Revolt · Accepted Answer

A: The cells on the shaded side of the plant will grow longer, causing the opposite side of the plant to grow toward the window.

Question 5

Which statements describe hydrotropism? Check all that apply. Hydrotropism is a plant’s response to light.Hydrotropism is a plant’s response to an external stimulus.Hydrotropism causes cells to grow longer on one side of the roots.Hydrotropism causes cells to grow longer on one side of the stems.Hydrotropism causes a plant to grow toward light.Hydrotropism causes a plant to grow away from light.

Revolt · Accepted Answer

B: Hydrotropism is a plant’s response to an external stimulus.; C: Hydrotropism causes cells to grow longer on one side of the roots.

Question 6

As a tree goes into dormancy, its leaves change color.What causes this change in color?

Revolt · Accepted Answer

B: The tree stops making chlorophyll.

Question 7

Students did an experiment. They grew four bean plants, each 6 inches tall, in square pots. Then they put the pots on their sides at the edge of a table. The students made some observations.Which experimental question were the students most likely trying to answer?

Revolt · Accepted Answer

B: How does gravitropism affect plant growth?

Question 8

Which statements describe thigmotropism? Select five options.Thigmotropism is a plant’s response to touch.Thigmotropism is a plant’s response to an external stimulus.Thigmotropism occurs only slowly.Thigmotropism can occur quickly or slowly.Thigmotropism may involve the way in which a plant grows.Thigmotropism may involve the closing and opening of plant leaves.

Revolt · Accepted Answer

A: Thigmotropism is a plant’s response to touch.; B: Thigmotropism is a plant’s response to an external stimulus.; D: Thigmotropism can occur quickly or slowly.; E: Thigmotropism may involve the way in which a plant grows.; F: Thigmotropism may involve the closing and opening of plant leaves.

Question 9

Which best describes the role of auxin?

Revolt · Accepted Answer

B: speeds up the growth of the plant on the shaded side

Question 10

Photoperiodism is a plant’s response to which stimulus?

Revolt · Accepted Answer

B: the length of the day

Plant Responses Answers

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