NEET BIOLOGY

Detailed explanation-1: -Hydrotropism modifies root growth to respond to a water potential gradient in soil and grow towards areas with a higher moisture content.

Detailed explanation-2: -Geotropism (also called gravitropism) is the directional growth of an organism in response to gravity. Roots display positive geotropism when they grow downward, while shoots display negative geotropism when they grow upward.

Detailed explanation-3: -Plant roots need to forage for water and nutrients in the soil. These key resources are not distributed equally through the soil so plants therefore have to send their roots towards the best available sources of water and nutrients.

Detailed explanation-4: -Directed growth of roots in relation to a gradient in moisture is called hydrotropism and begins in the root cap with the sensing of the moisture gradient.

Detailed explanation-5: -The roots grow towards gravity or the earth and this is called geotropism. Also, when there is less availability of water the root ends extend towards the moist soil that contains water. This is called hydrotropism.