Question :
Which of the following has no blood, but respires?
Option 1:
Fish
Option 2:
Earthworm
Option 3: Hydra
Option 4: Cockroach
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Correct Answer: Hydra
Solution : The correct answer is Hydra .
The Genus Hydra falls under the Phylum Cnidaria and is a small group of freshwater Hydrozoans. The body of Hydra is cylindrical and radially symmetrical. The body of Hydra does not contain blood instead, they have Mesenchymal stem cells. This cell is present in their bone marrow, fat tissue, tendon, ligaments, and muscles. They respire through their tentacles using Diffusion.
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