In Bugs, cockroach and roundworms, the males possess

Options

A. one chromosome less than the female
B. two similar sex chromosomes
C. one chromosome different from rest
D. a Y-chromosome

Answer

### Step-by-Step Solution:

1. **Identify the Organisms**: The question refers to bugs, cockroaches, and roundworms. We need to understand the sex chromosome composition in males of these organisms.

2. **Understand Chromosome Composition**: In many organisms, males and females have different sex chromosome configurations. In this case, we need to focus on the male chromosome structure.

3. **Examine Male Chromosomes**: In bugs, cockroaches, and roundworms, the males typically have a sex chromosome composition of X0. This means they have one X chromosome and no corresponding Y chromosome.

4. **Compare with Females**: In contrast, females in these species usually have two X chromosomes (XX). This indicates that males have one less sex chromosome than females.

5. **Conclusion**: Therefore, in bugs, cockroaches, and roundworms, the males possess one sex chromosome less than the females.

6. **Final Answer**: The males possess one chromosome less than the females.