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Assertion: The blood in a cockroach lacks a respiratory pigment and appears colorless.
Reason: Gaseous exchange in cockroaches takes place solely through diffusion in the hemolymph.
If both the assertion and reason are true, with the reason providing a correct explanation for the assertion.
If both the assertion and reason are true, but the reason does not adequately explain the assertion.
If the assertion is true, but the reason is false.
If both the assertion and reason are false.
Answers (1)
The assertion that the blood in a cockroach lacks a respiratory pigment and appears colorless is true. Cockroaches have an open circulatory system, and their blood is known as hemolymph. It does not contain respiratory pigments like hemoglobin, resulting in its colorless appearance. However, the reason provided, stating that gaseous exchange occurs solely through diffusion in the hemolymph, is false. In cockroaches, the gaseous exchange also takes place through a specialized network of tubules called tracheae, which allow direct air exchange with tissues. Therefore, while the assertion is accurate, the reason given is not a correct explanation for it.
Hence, the correct answer is option 3.
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