NEET BIOLOGY

Detailed explanation-1: -One important light response in plants is phototropism, which involves growth toward-or away from-a light source. Positive phototropism is growth towards a light source; negative phototropism is growth away from light.

Detailed explanation-2: -When a plant receives sunlight from only one direction, the shoot of that plant bends in the direction of the sunlight. This is because of the hormone auxin which accumulates in the side where sunlight is not present.

Detailed explanation-3: -Hormones in the plant’s tissues, called auxins, make cells on the dark side of the plant grow taller, bending the plant toward the light.

Detailed explanation-4: -Plant shoots display positive phototropism: when illuminated from one direction, the shoot proceeds to grow in that direction.

Detailed explanation-5: -Generally, leaves and stems grow upward, toward light sources, while roots grow downward.