Tropism is a biological phenomenon where an organism, usually a plant, is capable of directed physical movement or growth in response to a specific stimulus. What is the term for a plants movement or growth in response to gravity?

PLANT AND WOOD ANATOMY

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Tropism is a biological phenomenon where an organism, usually a plant, is capable of directed physical movement or growth in response to a specific stimulus. What is the term for a plant’s movement or growth in response to gravity?

A	gravitropism (geotropism)
B	hydrotropism
C	phototropism
D	thigmotropism

Explanation:

Detailed explanation-1: -In biology, a tropism is a phenomenon indicating growth or turning movement of an organism, usually a plant, in response to an environmental stimulus. In tropisms, this response is dependent on the direction of the stimulus (as opposed to nastic movements which are non-directional responses).

Detailed explanation-2: -Plant parts can grow with or against gravity. This type of tropism is called gravitropism. Roots of a plant grow downward and exhibit positive gravitropism. Stems, on the other hand, exhibit negative gravitropism since they grow upwards and against the force of gravity (see Figure 1).

Detailed explanation-3: -Tropism is when a plant moves in response to an external stimulus in the environment. Positive tropism is when a plant moves towards a stimulus. Negative tropism is when a plant moves away from a stimulus.

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OBJECTIVE FORESTRY

FORESTRY

PLANT AND WOOD ANATOMY