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 a cockroach and to arrange them in increasing order, we will analyze each feature step by step.

### Step 1: Identify the Features and Their Values
1. **Number of ovarioles in a female cockroach (Ov)**: Each ovary has 8 ovarioles, and since there are two ovaries, the total is 16 ovarioles.
2. **Average number of oothecae produced by a female cockroach (Ot)**: A female cockroach produces an average of 9 to 10 oothecae.
3. **Number of times a nymph of cockroach undergoes moulting (M)**: Nymphs undergo moulting approximately 10 to 13 times to reach adulthood.
4. **Number of gastric caecae present in cockroach (G)**: There are 6 pairs of gastric caecae, which totals to 12 gastric caecae.

### Step 2: Assign Numerical Values for Comparison
- **Ovarioles (Ov)**: 16
- **Oothecae (Ot)**: Average of 9 to 10 (let's take 9 for the sake of comparison)
- **Moulting (M)**: Average of 10 to 13 (let's take 10 for the sake of comparison)
- **Gastric Caecae (G)**: 12

### Step 3: Arrange in Increasing Order
Now we can arrange these values in increasing order:
1. Oothecae (9)
2. Moulting (10)
3. Gastric Caecae (12)
4. Ovarioles (16)

### Final Arrangement
Thus, the correct increasing order of the features is:
1. Average number of oothecae produced by a female cockroach (Ot)
2. Number of times a nymph of cockroach undergoes moulting (M)
3. Number of gastric caecae present in cockroach (G)
4. Number of ovarioles in a female cockroach (Ov)

### Answer
The correct arrangement in increasing order is: **Ot < M < G < Ov**

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