If there are two communities A and B of plants. In the year 2010 there was a similar natural disturbance in both the communities . Depending on the given data choose how mnay are the correct statements ?
(i) A and B are equally stable.
(ii) A has more species than B.
(iii) A and B have equal diversity of species
(vi) B is more stable than A
`{:(,"Year","Year","Year","Year"),(,2009,2010,2011,2012),("Biomass",A=1000,A=800,A=950,A=1000),(("Total"),"Units","Units","Units","Units"),(,B=1000,B=100,B=500,B=100),(,"Units","Units","Units","Units"):}`

Options

A. One
B. Two
C. Three
D. None

Explanation

To determine how many statements about the two plant communities A and B are correct, we will analyze each statement based on the given data regarding their biomass over the years.

### Step-by-Step Solution:

1. **Understanding Stability**:
- Stability in an ecosystem refers to its ability to return to a steady state after a disturbance.
- In 2009, both communities A and B had a biomass of 1000 units. After the disturbance in 2010, A decreased to 800 units, while B decreased drastically to 100 units.

2. **Evaluating Statement (i)**: "A and B are equally stable."
- Since A returned to 950 units in 2011 and reached 1000 units again in 2012, it shows a higher stability compared to B, which only reached 500 units in 2011 and remained at 100 units in 2012.
- **Conclusion**: This statement is **incorrect**.

3. **Evaluating Statement (ii)**: "A has more species than B."
- Given that A has maintained a higher biomass over the years compared to B, it is reasonable to infer that A supports more species.
- **Conclusion**: This statement is **correct**.

4. **Evaluating Statement (iii)**: "A and B have equal diversity of species."
- Since A has more biomass and is more stable, it likely has a greater diversity of species compared to B.
- **Conclusion**: This statement is **incorrect**.

5. **Evaluating Statement (iv)**: "B is more stable than A."
- As established earlier, A has shown a greater ability to return to its original biomass after the disturbance, while B has not.
- **Conclusion**: This statement is **incorrect**.

### Final Assessment:
- Out of the four statements, only one statement (ii) is correct.

### Summary:
- **Correct Statements**: 1
- **Incorrect Statements**: 3