Haemoglobin is dissolved in the blood of:___________?
Correct answer: A. Earthworm
- A. Earthworm
- B. Cockroach
- C. Hydra
- D. Sponges
Explanation
In earthworms, haemoglobin is dissolved directly in the plasma rather than enclosed in red blood cells, and it transports oxygen through the closed circulatory system. Students may choose cockroach because it has haemolymph, but cockroach respiratory tubes deliver oxygen directly and its haemolymph generally does not use haemoglobin for oxygen transport.
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