Question

Positive phototropism involves

• A. growth of plants in the direction of light
• B. increased absorption of sunlight by plant cells
• C. growth of plants in the opposite direction to the sunlight
• D. None of the above.

Answer 1

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.