The materials which do not require for normal growth and development are called:

Primary metabolites

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Secondary metabolites

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Sap

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Lymph

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Solution

The correct option is B Secondary metabolites
The materials which do not require for normal growth and development are secondary metabolites. e.g.: Alkaloids, Tannins, Resins, Gums, and Latex etc. Though plants produce these chemicals for their own use. Man found the usage of these chemicals for own benefits. They are generally coloured and fragrant.

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Food and water are two necessary materials for the normal growth of plants.

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