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Phototropism in Biology

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Questions and Answers

What hormone is present in the cells farthest from the light during phototropism?

Cytokinin

Auxin (correct)

Gibberellin

Ethylene

Which term describes the growth of an organism towards a light source?

Positive phototropism (correct)

Gravitropism

Negative phototropism

Skototropism

What does the combination of phototropism and gravitropism allow plants to do?

Grow towards a light source only

Remain stationary

Grow away from darkness only

Grow in the correct direction (correct)

In what direction do most plant shoots exhibit phototropism?

Upwards Signup and view all the answers

Which type of movement is defined as growth towards darkness?

Skototropism Signup and view all the answers

Explain the difference between positive phototropism and negative phototropism.

Positive phototropism is growth towards a light source, while negative phototropism is growth away from a light source or towards darkness. Signup and view all the answers

How does the presence of auxin in cells farthest from the light contribute to phototropism?

Auxin in cells farthest from the light causes elongation of those cells, leading to bending towards the light source. Signup and view all the answers

Explain how phototropism and skototropism differ in their response to light and darkness.

Phototropism involves growth towards light, while skototropism is growth towards darkness. Signup and view all the answers

What is the role of chloroplast rearrangement in the leaves of plants exhibiting positive phototropism?

Chloroplast rearrangement helps plants maximize photosynthetic energy and promote growth towards the light source. Signup and view all the answers

How does negative phototropism in some vine shoot tips benefit the plant?

Negative phototropism in vine shoot tips allows the plant to grow towards dark, solid objects and climb them. Signup and view all the answers