Match the following  
`{:(" A"," B"),("1) Number of Peritremes ","a) 16"),("2) Number of spiracles in abdomen ","b) 20 "),("3) Number of ostia ","c) 24"),("4) Number of chambers of heart in thorax ","d) 3"):}`

Options

A. 1-b, 2-a, 3-c, 4-d
B. 1-c, 2-a, 3-d, 4-b
C. 1-a, 2-b, 3-c, 4-d
D. 1-d, 2-a, 3-c, 4-a

Answer

To solve the matching question, we need to pair the items in column A with the correct items in column B based on the information provided in the transcript. Let's go through each item step by step.

### Step-by-Step Solution:

1. **Number of Peritremes**:
- Peritremes are valve-like structures associated with spiracles, which help in the filtration of air.
- According to the transcript, the number of peritremes is **20**.
- Therefore, we match **1) Number of Peritremes** with **b) 20**.

2. **Number of Spiracles in Abdomen**:
- Spiracles are openings on the body used for gas exchange.
- The transcript states that the number of spiracles in the abdomen is **16**.
- Thus, we match **2) Number of Spiracles in Abdomen** with **a) 16**.

3. **Number of Ostia**:
- Ostia are openings in the heart of a cockroach that allow blood to enter.
- The transcript mentions that there are **24 ostia**.
- Hence, we match **3) Number of Ostia** with **c) 24**.

4. **Number of Chambers of Heart in Thorax**:
- The heart of a cockroach is made up of chambers, and the thorax contains **3 chambers**.
- Therefore, we match **4) Number of Chambers of Heart in Thorax** with **d) 3**.

### Final Matches:
- 1) Number of Peritremes → b) 20
- 2) Number of Spiracles in Abdomen → a) 16
- 3) Number of Ostia → c) 24
- 4) Number of Chambers of Heart in Thorax → d) 3

### Correct Sequence:
- The correct sequence is:
- 1 → b
- 2 → a
- 3 → c
- 4 → d

Thus, the answer is option number **1**.