Question

The respiratory pigment present in cockroaches is

• A. Haemozoin
• B. Hemoglobin
• C. Haemocyanin
• D. None of these

Answer 1

The correct option is D

None of these

The correct option is D.

The explanation for the correct option:

1. Cockroaches' blood (hemolymph) is colorless as they do not have any respiratory pigment in their blood.
2. Plasma and multiple blood corpuscles make up hemolymph (hemocytes).
3. Hemolymph is a fluid that carries nutrients throughout the body but does not participate in the exchange of O₂ and CO₂ because it lacks respiratory pigment.

The explanation for the incorrect options:

Option A:

Hemozoin is a crystalline brown pigment produced by the degradation of hemoglobin (Hb) in Plasmodium's digestive vacuole and retained there.

Option B:

Hemoglobin is a red-colored respiratory pigment found in humans and vertebrates that transports oxygen throughout the body.

Option C:

Hemocyanin is a copper-based pigment that helps invertebrates move oxygen throughout their bodies such as Mollusks and some arthropods.

Final Answer: None of the above respiratory pigments are present in the blood of cockroaches.