Question

What is the response of stem towards light & gravity? Name the types of tropism in both the cases.​

Answer 1

Answer:

A tropism (from Greek τρόπος, tropos, "a turning") is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus.

Phototropism

Plants grow towards or away from the light, the type of tropism in the response to light is called phototropism. In general, the stems usually show positive phototropism, while roots show negative phototropism. Leaves also positively respond toward the source of light.

Gravitropism

It is a type of tropism where plants show some growth in response to gravity. Stems are negative to the gravitropism while roots are positive to the gravitropism. This is also referred to as geotropism. Among different parts of plants, the primary roots and certain other portions of the root system show positive geotropism by growing directly towards the centre of gravity. The stems are called as the negatively geotropic as they grow away from the centre of gravity. The leaves are transversely geotropic as they select their positions at right angles to the centre of gravity.

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Answer 2

Answer:

stem show positive response towards light and negative response toward gravity.