The plant substance which become accumulated during adverse conditions are

Options

A. 1)Abscisic acid
B. 2)Phenolic inhibitors
C. 3)Auxins
D. 4)Cytokinins

Answer

To solve the question regarding the plant substance that accumulates during adverse conditions, we will analyze each of the provided options step by step.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a plant substance that accumulates during adverse conditions. Adverse conditions can include drought, salinity, extreme temperatures, and other stress factors that affect plant growth.

2. **Analyzing the Options**:
- **Option 1: Abscisic Acid**: This is a plant hormone known to play a role in stress responses, particularly in drought conditions. However, it is not a substance that accumulates; rather, it is synthesized in response to stress.
- **Option 2: Phenolic Inhibitors**: These are compounds that can accumulate in plants under stress. They often have protective functions, helping the plant cope with adverse conditions by providing defense against pathogens and environmental stressors.
- **Option 3: Auxin**: Auxins are plant hormones that regulate growth and are involved in processes like stem elongation. They do not accumulate in response to stress.
- **Option 4: Cytokinin**: Cytokinins are another class of plant hormones that promote cell division and growth. Similar to auxins, they are not substances that accumulate during adverse conditions.

3. **Identifying the Correct Answer**: Based on the analysis, the only option that represents a substance that accumulates in response to adverse conditions is **Option 2: Phenolic Inhibitors**.

4. **Conclusion**: Therefore, the correct answer to the question is **Phenolic Inhibitors**.

### Final Answer:
The plant substance which becomes accumulated during adverse conditions is **Phenolic Inhibitors**.

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