1.

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. (c) What is the effect of substance P on the rate of growth of (i) a root, and (ii) a stem? (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.

Answer»

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.

(c) What is the effect of substance P on the rate of growth of (i) a root, and (ii) a stem?

(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.


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