AP BIOLOGY

Detailed explanation-1: -In shoots, which are the stems and leaves of plants, auxin does the opposite: it promotes growth on the bottom of the cell and inhibits it on the top of the cell, causing the shoot to grow upwards. This is known as negative geotropism, because the growth goes against the pull of gravity.

Detailed explanation-2: -Stems are positively phototropic and roots are negatively phototropic. Geotropism is the movement that follows earth’s gravitational force. movement of plants downwards to the earth is called positive geotropism and movement of plants upwards of the earth is called negative geotropism.

Detailed explanation-3: -If the movement of the plant parts is towards the pull of gravity, it is known as positive geotropism; whereas if the movement of the plant parts is in the direction opposite to the pull of gravity, it is known as negative geotropism.

Detailed explanation-4: -Geotropism is a similar occurrence to phototropism where the plant exhibits directional growth in response to gravity. The shoot tip illustrates negative geotropism (grows against the force of gravity) while the root tip exhibits positive geotropism (grows in the same direction as gravity).