Plant Responses to Stimuli

Why do many plants needs a daily change of temperature?

• so they can sleep

• to ensure photosynthesis and respiration can occur so the plant can grow

• to regrow chlorophyll

• in order to produce a healthy seed

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NGSS.MS-LS1-5

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NGSS.MS-LS2-3

How do cold temperatures help some bulb plants?

• the cold forces the bulb to wake up

• the cold forces the bulb to produce chlorophyll

• the cold forces the bulb to mature

• the cold forced the bulb to migrate

A stimulus is ___________

• a change in an organisms surroundings.

• process in which organisms grow larger.

• a reaction to a change in surroundings

• tropism

Plant’s roots grow down, anchoring it into the soil. To what stimulus is the plant responding?

• thigmotropism

• hydrotropism

• phototropism

• geotropism

When a plant wilts due to a drought, it is responding to which of the following internal stimuli?

• Decreased water pressure within the plant cells.

• lack of nutrients carried by water in the plant.

• Decreased rate of photosynthesis in the stem.

• Increased storage of glucose in the leaves.

A stimulus is ___________

• anything that causes an organism to react.

• process in which organisms grow larger.

• a reaction to a change in surroundings

• tropism

The roots and stem of this plant are demonstrating?

• How temperature affects plants.

• How gravity affects plants.

• How air affects plants.

• How leaves affect plants.

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NGSS.MS-LS1-5

Plants tend to grow towards where the ________ is.

• Dark

• Cold

• Light

• Heat

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NGSS.MS-LS1-5

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The roots of a plant grow down because of what stimuli?

• Gravity

• Light

• Temperature

• All of the above

Stems grow away from _______.

• The sun

• Gravity

• Light

• Temperature