During an ecological succession, many changes occur. Select the wrong statement with respect to succession.
(i) Some species colonies and some species disappear
(ii) Diversity will not change during succession.
(iii) The total biomass increases .
(iv) The species number increases.

Options

A. (i) and (ii)
B. only (iii)
C. only (ii)
D. (iii) and (i)

Answer

To solve the question regarding ecological succession, we need to evaluate each of the provided statements and determine which one is incorrect.

### Step-by-Step Solution:

1. **Understanding Ecological Succession**:
- Ecological succession is the process through which ecosystems develop and change over time. It involves the gradual replacement of one community by another, leading to a stable climax community.

2. **Analyzing Statement (i)**:
- "Some species colonize and some species disappear."
- This statement is **correct**. During succession, pioneer species initially colonize the area, while other species may not survive due to changing conditions.

3. **Analyzing Statement (ii)**:
- "Diversity will not change during succession."
- This statement is **incorrect**. Diversity does change during succession as different species establish themselves, and some species may go extinct or leave the area. The composition of the community evolves over time.

4. **Analyzing Statement (iii)**:
- "The total biomass increases."
- This statement is **correct**. As succession progresses, more species and individuals establish themselves, leading to an increase in total biomass.

5. **Analyzing Statement (iv)**:
- "The species number increases."
- This statement is **correct**. As succession progresses, the number of species typically increases until a climax community is reached.

6. **Conclusion**:
- The only incorrect statement is (ii) "Diversity will not change during succession." Therefore, the answer to the question is that this statement is wrong.

### Final Answer:
The wrong statement with respect to succession is: **(ii) Diversity will not change during succession.**

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