Question Detail
Question
Which of the following organisms has no blood but respires?
Correct Answer
Option A is the correct answer.
Detailed Explanation
Earthworms lack a true blood vascular system with hemoglobin-containing red blood cells. Instead, they have a closed circulatory system with a red respiratory pigment (hemoglobin) dissolved in the plasma. They respire through their moist skin (cutaneous respiration), with oxygen diffusing directly across the body surface. Cockroaches, fish, and frogs all have blood.
Hint
This annelid respires through its skin and has a circulatory fluid without true blood cells.