Two morophologically similar populations are intersterile. They belong to
(a) One species
(b) Two biospecies
(c) Two sibling species
(d) None of the above

Options

A. One species
B. Two biospecies
C. Two sibling species
D. None of the above

Answer

To solve the question, let's break down the information provided and analyze the options step by step:

### Step 1: Understand the terms
- **Morphologically similar populations**: This means that the two populations look alike in terms of their physical characteristics.
- **Intersterile**: This indicates that these two populations cannot produce fertile offspring together, which is a key factor in defining species.

### Step 2: Analyze the options
- **(a) One species**: If the two populations were part of the same species, they would typically be able to interbreed and produce fertile offspring. Since they are intersterile, this option is not correct.

- **(b) Two biospecies**: The term "biospecies" is not commonly used in biological classification. Typically, species are defined based on reproductive isolation and genetic similarity. Since the populations are intersterile, they cannot be classified as two biospecies.

- **(c) Two sibling species**: Sibling species are closely related species that are morphologically similar but do not interbreed. Given that the populations are morphologically similar and intersterile, this option fits perfectly.

- **(d) None of the above**: Since we have found a suitable option (c), this option is not correct.

### Step 3: Conclusion
Based on the analysis, the correct answer is:
**(c) Two sibling species**