AP BIOLOGY

Detailed explanation-1: -Gravitropism is an important plant growth response to the environment that directs shoots upward and roots downward, thereby allowing each organ to reach environments that are adequate for performance of their primary functions.

Detailed explanation-2: -Gravitropism ensures that roots grow into the soil and that shoots grow toward sunlight. Growth of the shoot apical tip upward is called negative gravitropism, whereas growth of the roots downward is called positive gravitropism.

Detailed explanation-3: -A plant’s roots respond to gravity by growing mostly downward. A plant’s stem responds in the opposite way. The stem grows upward, away from the pull of gravity.

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