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Which one regulates plant growth ?...

Which one regulates plant growth ?

A

Commensalism

B

Climate

C

Hormones

D

Both B and C.

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Plant Growth Regulation**: - Plant growth is influenced by various factors, including internal and external conditions. 2. **Identifying Plant Hormones**: - Plant hormones, also known as phytohormones, play a crucial role in regulating growth. - Examples include: - **Auxins**: Promote cell elongation and growth. - **Cytokinins**: Stimulate cell division and growth. - **Gibberellins**: Promote stem elongation and seed germination. - **Ethylene**: Inhibits growth and promotes ripening. - **Abscisic Acid (ABA)**: Inhibits growth and helps plants respond to stress. 3. **Considering Climatic Factors**: - Climate also significantly influences plant growth. - Factors such as: - **Rainfall**: Affects water availability. - **Light**: Essential for photosynthesis. - **Temperature**: Influences metabolic rates. - **Humidity**: Affects transpiration and nutrient uptake. 4. **Excluding Irrelevant Options**: - **Commensalism**: This is a type of ecological relationship between two organisms where one benefits and the other is neither helped nor harmed. It does not play a role in regulating plant growth. 5. **Conclusion**: - Both plant hormones and climatic factors are essential in regulating plant growth. Therefore, the correct answer is that both **hormones (B)** and **climate (C)** regulate plant growth. ### Final Answer: Both B (Hormones) and C (Climate) regulate plant growth. ---
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