Certain chemical substances having profound effect on plant growth are called as .........

Catalytic agents

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Phytohormones

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Enzymes

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Compost

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Solution

The correct option is B Phytohormones
The plant growth regulators (PGRs) are small, simple molecules of diverse chemical composition. They could be indole compounds (indole-3-aceticacid, IAA); adenine derivatives (N6-furfurylamino purine, kinetin), derivatives of carotenoids (abscisic acid, ABA); terpenes (gibberellic acid,GA $_{3}$ ) or gases (ethylene, C $_{2} H_{4}$ ). Plant growth regulators are variously described as plant growth substances, plant hormones or phytohormones in literature.

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