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1.Plant hormones are special chemicals which regulate the growth of various plant parts.
2.The growth or movement of a plant or plant part in response to a chemical stimulus.
The growth or turning of plant roots towards or away from moisture.
3.Something that causes the reaction in an organ or cell.
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1)Plant hormones are the chemicals that regulate plant growth.They are also required in their metabolic activities and maintainig the functions of the plant body.

2)Hydro-tropism is the movement of a plant-body part or growth-response to the stimulus of water.
Chemo-tropism is the movement of a plant body part or growth response to the stimulus of chemicals.

3)Stimulus is the detectable change in the internal and external environment.It can be said as a reaction of our body (internal or external) when something happens to us.
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