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Cerain chmical substances having profoun...

Cerain chmical substances having profound effect on growth ,are called

A

Enzymes

B

Phytohormones

C

Catalytic agents

D

Manure.

Text Solution

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### Step-by-Step Solution: 1. **Understanding the Question**: The question asks about certain chemical substances that have a significant impact on plant growth. 2. **Identifying the Term**: The term that describes these chemical substances is "phytohormones." 3. **Definition of Phytohormones**: Phytohormones are plant hormones that regulate various aspects of plant growth and development. They are crucial for processes such as cell differentiation, cell elongation, and overall growth. 4. **Types of Phytohormones**: - **Auxins**: Promote cell elongation and are involved in the growth of stems and roots. - **Cytokinins**: Stimulate cell division and are important for shoot and root development. - **Gibberellins**: Promote stem elongation and seed germination. - **Ethylene**: Involved in the ripening of fruits. - **Abscisic Acid**: Acts as a growth inhibitor and helps plants respond to stress. 5. **Conclusion**: Based on the information gathered, the correct answer to the question is that these chemical substances that have a profound effect on growth are called "phytohormones."
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