Positive phototropism involves

growth of plants in the direction of light

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increased absorption of sunlight by plant cells

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growth of plants in the opposite direction to the sunlight

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None of the above.

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Solution

The correct option is A growth of plants in the direction of light
Phototropism comprises of two words: Photo (light), tropism (movement towards a stimulus). So, it can be defined as the response of plants towards a light source.

Phototropism may be positive or negative. Positive phototropism is the growth of different parts of plants in the direction of sunlight. Stems usually show positive phototropism.

Negative phototropism is the growth of different parts of plants in the direction opposite to sunlight. Roots generally show negative phototropism.

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Similar questions

Fill in the following blanks:

(a) A plant's response to light is called .................

(b) A plant's response to gravity is called .................

(d) Plant roots grow downward in response to .............

(e) Tendrils wind around a support in response to ..........

(f) Plant roots grow towards .......... and in the direction of force of ...............

(g) A root of a plant grows downward. This is known as ..............

(h) ........... is the hormone that causes phototropism in plants

(i) The response of leaves to the sunlight is called ..............

Plants change their direction in response to the stimulus of light.

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