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Question

Identify the following parts of the Respiratory system of a cockroach in the correct order of 1.,2.,3. and 4 : Choose the option with correct sequence.


A

1. Organs, 2. Spiracles, 3. Tracheoles , 4. Trachea.

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B

1. Spiracles, 2. Trachea, 3. Tracheoles, 4. Organs.

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C

1. Tracheoles, 2. Organs, 3. Spiracles, 4. Trachea.

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D

1. Trachea, 2. Tracheoles, 3. Organs, 4. Spiracles.

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Solution

The correct option is B

1. Spiracles, 2. Trachea, 3. Tracheoles, 4. Organs.


A cockroach has small openings on the sides of its body called spiracles. Air enters the respiratory system of a cockroach through these external openings, which act as muscular valves, leading to the internal respiratory system. The internal respiratory system is a densely networked array of air tubes called tracheae. This network of tracheae equalizes pressure throughout the system. After oxygen-rich air enters into the cockroach’s body through the spiracles into the tracheal tubes, it permeates into the body tissue and reaches every cell of the body, where the oxygen in the air is utilized to release energy. Similarly, the air rich in carbon dioxide, which is the product of the respiratory process, goes into the tracheae and moves out through the spiracles.
Answer: The correct sequence of the following parts analysed are :

(B) - 1. Spiracles, 2. Trachea, 3. Tracheoles, 4. Organs.


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