In cockroach, the nymph grows by moulting / ecdysis about how many times to reach the adult form

Options

A. 16
B. 13
C. 3
D. 18

Explanation

To answer the question regarding how many times the nymph of a cockroach undergoes moulting (ecdysis) to reach its adult form, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Process of Ecdysis**: Ecdysis, or moulting, is the process through which an insect sheds its old exoskeleton to allow for growth. This is a crucial part of the life cycle of insects, including cockroaches.

**Hint**: Recall that ecdysis is essential for growth in insects, as their exoskeletons do not stretch.

2. **Identify the Life Stages of Cockroach**: Cockroaches undergo several life stages, starting from the egg, then to the nymph, and finally to the adult form. The nymph is the immature form that resembles the adult but is smaller and lacks fully developed wings.

**Hint**: Think about the different stages in the life cycle of a cockroach and how they transition from one to another.

3. **Determine the Number of Moults**: In cockroaches, the nymph typically undergoes ecdysis approximately 6 to 13 times before reaching the adult stage. This number can vary depending on the species and environmental conditions.

**Hint**: Look for the range of moulting that is common in cockroaches, and remember that the exact number can vary.

4. **Select the Correct Option**: Given the options provided (16, 13, 3, or 18), the correct answer is that the nymph of a cockroach undergoes ecdysis about 6 to 13 times, which corresponds to option 13.

**Hint**: Cross-reference the options with the typical number of moults known for cockroaches.

### Final Answer:
The nymph of a cockroach grows by moulting (ecdysis) about **13 times** to reach the adult form.