Assertion :- The young one of cockroach does not look like adult cockroach.
Reason :- the mouth parts of young cockroach are not well developed like adult cockroach.

Options

A. A
B. B
C. C
D. D

Answer

### Step-by-Step Solution

1. **Understanding the Assertion**: The assertion states that "the young one of cockroach does not look like adult cockroach." This implies that there is a significant difference in appearance between the young and adult forms of the cockroach.

2. **Evaluating the Assertion**: The assertion is incorrect. Cockroaches undergo incomplete metamorphosis, meaning that the young, known as nymphs, resemble miniature versions of the adults. They may be smaller but share similar body structures.

3. **Understanding the Reason**: The reason provided states that "the mouth parts of young cockroach are not well developed like adult cockroach." This suggests that the young cockroach has underdeveloped mouth parts compared to the adult.

4. **Evaluating the Reason**: This statement is also incorrect. The mouth parts of young cockroaches (nymphs) are indeed present and functional, although they are smaller in size compared to those of adult cockroaches. They are not poorly developed; rather, they are proportionate to the size of the nymph.

5. **Conclusion**: Since both the assertion and the reason are false, the correct answer is that both statements are incorrect. Therefore, the appropriate option is that both the assertion and reason are false.

### Final Answer
Both the assertion and reason are false.