Question

Consider the following statements Assertion (A): Respiratory system of cockroach is polypneustic type. Reason (R): All spiracles are functional. The correct answer is

• A. Both (A) and (R) are true, (R) is the correct explanation of (A)
• B. Both (A) and (R) are true, (R) is not the correct explanation of (A)
• C. (A) is true, but (R) is false
• D. (A) is false, but (R) is true

Hint:

The terms holopneustic (all spiracles open) and polypneustic are often used interchangeably to describe systems with 8 or more pairs of functional spiracles.

Answer 1

The Correct Option is A

Concept: Classification of insect respiratory systems is based on the number of functional spiracles.
Explanation: A **polypneustic** (or holopneustic) system is characterized by having many functional spiracles. The cockroach has 10 pairs of functional spiracles, confirming that (A) is true. The Reason (R) correctly explains this: the functionality of all spiracles makes it polypneustic.