Page 117 - Science Course 1 (Book 1)

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

Osmosis
In vascular plants, Key Concept
water and nutrients What Changes Help a Plant Survive and
move inside specialized Grow?
vascular tissues. How do water and nutrients move in a
nonvascular plant? In a vascular plant?

Roots of plants absorb water and nutrients from the
soil.

Nutrients from the soil, such as minerals, are used
for making many of the compounds needed for cell
growth and maintenance.

Fibrous Root Taproot

Plant Responses

Stimuli are any changes in an organism’s
environment that cause a response.

External stimuli include light, touch, and gravity.
Internal stimuli, called hormones, are produced inside
a plant and can affect growth, seed germination, or
fruit ripening.

Uniform Non-Uniform No
Light Light Light
Transpiration is the release of water vapor from
stomata in leaves.

Plant growth toward or away from an external
stimulus is called tropism.

When a plant grows
toward a light source,
it is called positive
phototropism.

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