NEET BIOLOGY

Detailed explanation-1: -Roots move away from the light, which is called phototropism or grow towards gravity, which is called gravitropism . The combination of phototropism and gravitropism allow plants to grow in the correct orientation.

Detailed explanation-2: -The effect of light on plant growth is called phototropism. The effect of gravity on the direction of plant growth is called gravitropism. (The effect of gravity on plant growth is often called geotropism because the Earth itself (geo) is responsible for the stimulus.

Detailed explanation-3: -Phototropism, or the differential cell elongation exhibited by a plant organ in response to directional blue light, provides the plant with a means to optimize photosynthetic light capture in the aerial portion and water and nutrient acquisition in the roots.

Detailed explanation-4: -Gravitropism is the ability of plants to perceive and respond to the gravity vector and orient themselves accordingly.

Detailed explanation-5: -An example of plants responding to gravity is the fact that roots grow towards the earth and shoots grow away from the earth. This bidirectional growth is influenced by gravity, and is therefore called gravitropism.