Cerain chmical substances having profound effect on growth ,are called

Certain chemical substances having profound effect on growth are called

Certain chemical substances having profound effect on growth ,are called (a) Catalytic agents (b) Phytohormones (c) Enzymes (d) Compost

Certain chemical substances having profound effect on growth, are called

The chemical substance P is made and secreted by the meristematic tissue at the tip of stem (or shoot) of a plant. The chemical substance P is responsible for a phenomenon Q in plants in which the stem bends towards the 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. What is the effect of substance P on the rate of growth of (a) a root and (b) a stem?

The substance having infinitely high electrical resistance is called:

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

What are the hazardous substance that show effection the growth of foetus ?