NEET BIOLOGY

Detailed explanation-1: -The correct answer is Geotropism. Geotropism is the growth of the parts of plants in response to the force of gravity. The root of a plant growing down into the ground is an example of geotropism. The upward growth of plant parts, against gravity, is called negative geotropism.

Detailed explanation-2: -For instance, the roots of the plants grow towards the gravitational field whereas the stem grows away from the gravitational field. The downward growth of roots is an example of a positive gravitropism whereas the upward growth of roots is an example of negative gravitropism.

Detailed explanation-3: -This type of tropism is called gravitropism. For example, the roots of most plants exhibit positive gravitropism when they grow downward. Shown is a colour photograph of a cross-section of grass with roots growing down into soil.

Detailed explanation-4: -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-5: -Gravitropism (also known as geotropism) is a coordinated process of differential growth by a plant in response to gravity pulling on it.