A: continued self pollination checks inbreeding depression
R: pollen release and stigma receptivity are synchornised

Options

A. if both assetion A reason are ture and the reason is the correct explanation of the assertion then mark
B. if both assertion & reason are ture and the reason is not the correct explanation of the assertin then mark
C. if assertion is true statement but reason is false then mark
D. if both assertion and reason are flase statements then mark

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that "continued self-pollination checks inbreeding depression." We need to analyze whether this statement is true or false. Inbreeding depression refers to the reduced biological fitness in a given population due to inbreeding, or mating of individuals who are closely related genetically.

2. **Analyzing Self-Pollination**: Self-pollination occurs when pollen from the same flower fertilizes its ovules. This can lead to inbreeding depression because it increases the likelihood of homozygosity for deleterious alleles, which can accumulate over generations. Therefore, self-pollination does not check inbreeding depression; rather, it can exacerbate it.

3. **Conclusion on Assertion**: Since self-pollination does not check inbreeding depression, the assertion is **false**.

4. **Understanding the Reason**: The reason given is that "pollen release and stigma receptivity are synchronized." This means that the timing of pollen release and the readiness of the stigma to receive pollen occur at the same time.

5. **Analyzing Synchronization**: In many plants that undergo self-pollination (like autogamous plants), the timing of pollen release and stigma receptivity can vary. In fact, many species have mechanisms to ensure that these processes are not synchronized to promote cross-pollination. Thus, this statement is also **false**.

6. **Final Conclusion**: Both the assertion and the reason are false. Therefore, the correct answer is that both the assertion and the reason are false.