Which of the following hormones helps in maintaining nymphal character in cockroach?

Options

A. Neotinin
B. Ecdysone
C. Gonadotrophic hormone
D. Growth hormone

Answer

To determine which hormone helps in maintaining nymphal characters in cockroaches, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Nymphal Characters**:
- Nymphal characters refer to the immature or juvenile traits that are present in the nymph stage of cockroaches. These traits are crucial for the development and growth of the cockroach before it reaches maturity.

2. **Identifying the Hormones**:
- The question provides four hormone options: Neotenin, Ecdysone, Gonadotropic Hormone, and Growth Hormone. We need to analyze each hormone to see which one is associated with maintaining nymphal characters.

3. **Analyzing Neotenin (Juvenile Hormone)**:
- Neotenin is also known as Juvenile Hormone. This hormone is responsible for maintaining the immature characteristics of insects. It prevents the transition from the nymph stage to the adult stage, thereby preserving nymphal traits.

4. **Examining Ecdysone**:
- Ecdysone is a hormone that regulates molting and metamorphosis in insects. It triggers the process of shedding the exoskeleton and transitioning to the next developmental stage, which is not related to maintaining nymphal characters.

5. **Considering Gonadotropic Hormone**:
- Gonadotropic Hormones are involved in the development of reproductive organs (gonads) in insects. They do not play a role in maintaining nymphal characteristics.

6. **Looking at Growth Hormone**:
- Growth Hormones are involved in overall growth and development throughout the life cycle of an organism. However, they do not specifically maintain nymphal traits.

7. **Conclusion**:
- Based on the analysis, Neotenin (Juvenile Hormone) is the hormone that helps in maintaining nymphal characters in cockroaches. Therefore, the correct answer is **Neotenin**.