Consider following statement regarding microspheres.
(i) They were spherical in shape and 1-2 `mum` in diameter.
(ii) They hand concentric double layered boundaries.
(iii) They could grow in size but were not able to reproduce.
(iv) They used ATP as source of energy.
Which of the above statements is/are incorrect?

Options

A. i only
B. ii only
C. iii only
D. none of these

Explanation

To determine which statements regarding microspheres are incorrect, we will evaluate each statement one by one based on our understanding of microspheres and their characteristics.

### Step-by-Step Solution:

1. **Statement (i): They were spherical in shape and 1-2 µm in diameter.**
- **Evaluation**: This statement is correct. Microspheres are indeed small, spherical structures typically ranging from 1 to 2 micrometers in diameter.

2. **Statement (ii): They had concentric double-layered boundaries.**
- **Evaluation**: This statement is also correct. Microspheres are characterized by having a double-layered membrane, which distinguishes them from simpler structures like coacervates.

3. **Statement (iii): They could grow in size but were not able to reproduce.**
- **Evaluation**: This statement is incorrect. Microspheres are capable of reproduction and self-replication, similar to coacervates. Therefore, the claim that they cannot reproduce is false.

4. **Statement (iv): They used ATP as a source of energy.**
- **Evaluation**: This statement is correct. Microspheres exhibit some metabolic activities and can utilize ATP as a source of energy.

### Conclusion:
Based on the evaluations:
- **Incorrect Statement**: (iii) They could grow in size but were not able to reproduce.
- **Correct Statements**: (i), (ii), and (iv).

Thus, the only incorrect statement is statement (iii).

### Final Answer:
The incorrect statement is **(iii)**.

---