`50%` sperms are devoid of sex-chromosomes in
(a) Melandrium
(b) Moth
(c) Grasshopper
(d) Bee

Options

A. Melandrium
B. Moth
C. Grasshopper
D. Bee

Answer

To solve the question regarding which organism has 50% of its sperms devoid of sex chromosomes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks which organism has 50% of its sperms lacking sex chromosomes. We need to identify the organism from the given options: Melandrium, Moth, Grasshopper, and Bee.

2. **Review Sex Determination Mechanisms**: Different organisms have various mechanisms for sex determination. For example:
- **Melandrium**: Uses XY sex determination.
- **Moth**: Generally follows the XX-XY system.
- **Grasshopper**: Uses the XO sex determination system.
- **Bee**: Has a haplodiploid system.

3. **Focus on Grasshopper's Sex Determination**: In grasshoppers (which follow the XO system), males have one X chromosome (X) and no second sex chromosome (O). During spermatogenesis, the male grasshopper produces two types of sperm:
- Sperm with the X chromosome.
- Sperm without any sex chromosome (O).

4. **Calculate the Proportion of Sperm Types**: In grasshoppers, since males have one X chromosome, 50% of the sperm produced will carry the X chromosome, while the other 50% will be devoid of any sex chromosome.

5. **Conclusion**: Based on the understanding of the sex determination system in grasshoppers, the correct answer to the question is (c) Grasshopper.

### Final Answer:
(c) Grasshopper

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