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: -Complete Answer:-Stems of the plant show negative geotropism while the roots show positive 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: -Plant shoots show negative geotropism and grow away from the force of gravity. This ensures that plants grow upwards and means that more light is absorbed for photosynthesis. Roots show positive geotropism and grow towards the force of gravity.

Detailed explanation-5: -Phototropism is a response to the stimulus of light, whereas geotropism (also called gravitropism) is a response to the stimulus of gravity . Plants responses to gravity: when the stem grows against the force of gravity, this is known as a negative geotropism.