Question:
Which respiratory pigment is found in cockroaches?
Which respiratory pigment is found in cockroaches?
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No pigment = Clear "blood." Cockroaches breathe through holes in their sides, not their blood!
Updated On: May 5, 2026
- Haemoglobin
- Haemerythrin
- Haemocycanin
- None -- no respiratory pigment
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Concept
Respiratory pigments like haemoglobin are typically used to transport oxygen through the blood (circulatory system) to tissues.
Step 2: Meaning
Cockroaches have an open circulatory system where the "blood" (haemolymph) does not play a major role in oxygen transport.
Step 3: Analysis
Cockroaches use a tracheal system—a network of tubes that delivers air directly to the tissues. Because oxygen reaches cells directly via these tubes, there is no need for a chemical pigment in the fluid to carry it.
Step 4: Conclusion
Consequently, their haemolymph is colorless and lacks any respiratory pigments like haemoglobin or haemocyanin. Final Answer: (D)
Respiratory pigments like haemoglobin are typically used to transport oxygen through the blood (circulatory system) to tissues.
Step 2: Meaning
Cockroaches have an open circulatory system where the "blood" (haemolymph) does not play a major role in oxygen transport.
Step 3: Analysis
Cockroaches use a tracheal system—a network of tubes that delivers air directly to the tissues. Because oxygen reaches cells directly via these tubes, there is no need for a chemical pigment in the fluid to carry it.
Step 4: Conclusion
Consequently, their haemolymph is colorless and lacks any respiratory pigments like haemoglobin or haemocyanin. Final Answer: (D)
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