BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Phototropism (photon = light): It’s a directional movement of plant in response to light. Plant parts such as shoots always shows positive phototropism i.e., grows towards light while roots show negative phototropism i.e. grown in opposite direction from light source.

Detailed explanation-2: -Positive phototropism is growth towards a light source; negative phototropism is growth away from light. Shoots, or above-ground parts of plants, generally display positive phototropism-they bend toward the light.

Detailed explanation-3: -Most plant shoots exhibit positive phototropism, and rearrange their chloroplasts in the leaves to maximize photosynthetic energy and promote growth. Some vine shoot tips exhibit negative phototropism, which allows them to grow towards dark, solid objects and climb them.

Detailed explanation-4: -Phototropism is a directional response to sunlight. Plant shoots show positive phototropism and grow towards the sun. This maximises the amount of light they can absorb for photosynthesis.

Detailed explanation-5: -Photosynthesis requires light. So it’s beneficial for the shoots and leaves to grow towards light to access more of it for photosynthesis. Therefore, the shoots could be described as positively phototropic, as they’re growing towards light.