AP BIOLOGY

Detailed explanation-1: -The movement of the roots of the plant towards the gravity or the interior of the earth is known as geotropism. This response is shown during movement of roots in search of water. So, the correct answer is ‘Geotropism’

Detailed explanation-2: -Geotropism is a type of tropism where plants show some growth in response to gravity. Roots growing downwards is an example of geotropism.

Detailed explanation-3: -Explain to students that plants respond to different forces; sunflowers follow the light, pea tendrils grasp whatever they touch, and plants respond to gravity. This response to gravity is called Geotropism. Geotropism causes roots to grow downward, and stems and leaves to grow up.

Detailed explanation-4: -The roots start growing downward while the stem grows upward. This response to gravity is called geotropism.

Detailed explanation-5: -The movement towards the earth, due to gravity is called positive geotropism and is exhibited by roots. Movement away from the earth and gravity is called negative geotropism and is exhibited by shoots.