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

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Solution

Plant hormones are chemical substances which bring about the control and coordination in plants.

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

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

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.

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

(d) What is the name of process (i) Q and (ii) R?

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

Chemical messengers responsible for control and coordination in plants and animals are called ___

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