What is the general name of chemical substances which bring about control and coordination in plants?

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Solution

In plants, the function of control and coordination is performed by chemical substances called plant hormones, also known as Phytohormones.

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Q. Name the type of chemical substances that control the growth in plants.

A chemical substance P is made and secreted by the meristematic tissue at the tip of the stem (or shoot) of a plant. The chemical substance P is responsible for a phenomenon Q in plants in which the stem bends towards a source of light. The same chemical substance P has an opposite effect on the root of a plant. It causes the root of a plant to bend away from the source of light in a process called R.

(a) What is the chemical substance P?

(b) State, whether P prefers to, remains in the sunlight side of a stem or in shade.

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(e) What is the general name of chemical substances like P? Name another substance which belongs to this class of chemical substances.

Q. What is the general name of chemical substances which bring about control and coordination in plants?

Q. What is the general name of the substance that brings about control and coordination in plants?

Chemical messengers responsible for control and coordination in plants and animals are:

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