Question

blood of insects does not contain haemoglobin why?

Answer 1

It is so because insect don't have an iron based system which is the cause of haemoglobin or we can say the red colouration of the blood for transporting oxygen,, for transporting of oxygen they use a system of Spiracles.

Answer 2

The blood of an insect functions differently than the blood of a human. In humans, blood gets its red color from haemoglobin, which travels through blood vessels carrying oxygen from the lungs to the rest of the body. Insect blood however, does not carry gases and has no haemoglobin.