Following are some features of cockroach:
I. Number of ovarioles in a female cockroach (Ov)
II. The average number of oothecae produced by a female cockroach ( Ot)
III. The number of times a nymph of cockroach undergoes moulting (M)
IV. The number of gastric caecae present in cockroach (G)
The correct arrangement of these in their increasing order is

Options

A. `G lt Ov lt Ot lt M `
B. `G lt Ov lt M lt Ot`
C. `Ov lt G lt "Ot" lt M`
D. ` G lt Ot lt M lt Ov`

Answer

To solve the question regarding the features of the cockroach and their correct arrangement in increasing order, we need to analyze each feature one by one.

### Step-by-Step Solution:

1. **Number of Ovarioles in a Female Cockroach (Ov)**:
- A female cockroach has 2 ovaries, and each ovary contains approximately 8 ovarioles. Therefore, the total number of ovarioles is:
\[ \text{Total ovarioles} = 2 \times 8 = 16 \]

2. **Average Number of Oothecae Produced by a Female Cockroach (Ot)**:
- A female cockroach produces about 9 to 10 oothecae during its lifetime. For the sake of this arrangement, we can take the average as 9.5 (but we will consider it as 10 for simplicity).

3. **Number of Times a Nymph of Cockroach Undergoes Moulting (M)**:
- A nymph of a cockroach undergoes molting approximately 13 times before it reaches adulthood.

4. **Number of Gastric Caecae Present in Cockroach (G)**:
- The number of gastric caecae in a cockroach is approximately 6 to 8. For the sake of this arrangement, we can consider it as 7.

### Summary of Values:
- Ov (Number of Ovarioles): 16
- Ot (Number of Oothecae): 10
- M (Number of Moulting): 13
- G (Number of Gastric Caecae): 7

### Arranging in Increasing Order:
Now, we can arrange these values in increasing order:
1. Gastric Caecae (G) = 7
2. Oothecae (Ot) = 10
3. Moulting (M) = 13
4. Ovarioles (Ov) = 16

Thus, the correct arrangement in increasing order is:
**G < Ot < M < Ov**

### Final Answer:
The correct arrangement of these features in their increasing order is:
**G < Ot < M < Ov**