Phototropism Flashcards

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Note: We may include questions that have multiple correct answers. It's useful to remember specific examples to understand these concepts better.

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What is phototropism?

Phototropism is when a plant grows in response to light.

In phototropism, what is the stimulus the plant responds to?

The stimulus is the direction and intensity of light.

Do plant shoots show positive or negative phototropism, and what does this mean?

Shoots show positive phototropism, which means they grow towards the light.

Why is positive phototropism helpful for a plant?

It helps leaves reach more light, so the plant can do more photosynthesis.

Which plant hormone controls phototropism in shoots?

The hormone auxin controls how shoots bend in response to light.

Where in a shoot is most auxin made for phototropism?

Most auxin is made in the tip of the shoot.

What happens to auxin in a shoot when light shines from one side?

Auxin moves to the shaded side, so cells there grow longer and the shoot bends towards the light.

What happens to phototropism if the tip of a shoot is cut off?

The shoot stops bending towards light, because the tip that makes auxin is gone.

What happens in a phototropism experiment if the tip of a shoot is covered so light cannot reach it?

The shoot grows straight, because the tip cannot sense the direction of the light.

What is negative phototropism, and which part of a plant may show it?

Negative phototropism is growth away from light; some roots grow away from light.

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