BIOMOLECULES AND ENZYMES

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: -Geotropism. Geotropism is the growth response of a plant in response to gravity. Roots exhibit positive geotropism while stems and leaves exhibit negative geotropism.

Detailed explanation-3: -Summary. Scientists have identified a plant hormone, beta-cyclocitral, that makes tomato and rice plant roots grow faster and branch more. The hormone could help farmers enhance crop plant growth.

Detailed explanation-4: -Unlike animals, plants can’t run, fly, or swim toward food or away from danger. They are usually rooted to the soil. Instead, a plant’s primary means of response is to change how it is growing. Plants also don’t have a nervous system to control their responses.