Page 118 - Science Course 1 (Book 1)

Mo4-L2b: What Changes Help a Plant Survive and Grow?

A plant’s response Key Concept
to gravity is called
gravitropism. What Changes Help a Plant Survive and
Grow?
How do plants respond to environmental
changes?

A plant’s response
to touch is called
thigmotropism.

SUMMARY

What Changes Help a Plant to Survive and
Grow?
All plants must be able
to transport water and
minerals in order to
survive.

Plants respond to
internal and external
stimuli.

Mo4-L2: Vocabulary Review

Directions: Answer each question on the lines provided. You must include the terms below in your answer.

diffusion organelle osmosis stimulus transpiration tropism

1. What is a tropism? Distinguish between positive phototropism and negative phototropism.

2. Through what process is water vapor released in plants? Why is the release of water vapor important to
plants?

3. Why are osmosis and diffusion important to nonvascular plants?

4. What is a stimulus? Provide examples of internal and external stimuli.

5. What is an organelle? Why are organelles important to plants?

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