Which phenomenon in plants refers to their response to sunlight?

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Phototaxis

Phototropism

Photosynthesis

Photolysis

answer is A.

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Detailed Solution

The correct answer is 'Phototropism'.

Phototropism is a directional response in plants that allows them to grow towards or away from a light source. This response is controlled by the hormone auxin, which accumulates on the shaded side of the plant and causes the cells to elongate, bending the plant toward the light. This mechanism is important for plants to optimize their exposure to sunlight for photosynthesis, which is the process by which they produce food.

Photolysis refers to the splitting of a substance due to light and is not related to plant responses to sunlight.

Photosynthesis is the process by which plants produce food with the help of sunlight and other inorganic substances. While it is related to plant responses to sunlight, it is not the phenomenon referred to in the question.

Phototaxis refers to the movement of organisms toward the light and is not specific to plants.

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