A. Complete parthenogenesis is also called obligatory parthenogenesis .
R. It occurs in animals which breed exclusively by this method

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion
B. It both Assertion & Reason are true but the reason is not the correct explanation of the assertion
C. If Assertion is true statement but Reason is false
D. If both Assertion and Reason are false statements

Answer

### Step-by-Step Solution:

1. **Understanding Parthenogenesis**:
- Parthenogenesis is a form of asexual reproduction where an egg develops into an organism without fertilization. This process primarily involves the female gamete.

2. **Types of Parthenogenesis**:
- Parthenogenesis can be categorized into two main types:
- **Natural Parthenogenesis**: This occurs naturally in certain species.
- **Artificial Parthenogenesis**: This is induced by human intervention.

3. **Complete vs. Incomplete Parthenogenesis**:
- Natural Parthenogenesis is further divided into:
- **Complete (Obligatory) Parthenogenesis**: In this type, certain organisms reproduce exclusively through parthenogenesis, without any sexual phase or male involvement.
- **Incomplete Parthenogenesis**: This involves a mix of sexual and asexual reproduction.

4. **Assertion Analysis**:
- The assertion states that "Complete parthenogenesis is also called obligatory parthenogenesis." This is true because organisms that reproduce solely through this method do not engage in sexual reproduction.

5. **Reason Analysis**:
- The reason states that "It occurs in animals which breed exclusively by this method." This is also true as complete parthenogenesis is observed in species that do not have a male counterpart or a sexual phase.

6. **Conclusion**:
- Both the assertion and reason are true, and the reason accurately explains the assertion. Therefore, the correct answer is that both statements are true, and the reason is a correct explanation of the assertion.