SCIENCE
CIRCULATORY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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There is no blood
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Blood does not have respiratory function Pigments are elsewhere
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Tissues have pigments
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Pigments are elsewhere
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Detailed explanation-1: -Hint: Blood in insects is called hemolymph and is pale yellow or greenish because of the absence of respiratory pigments. Oxygen transport in blood mainly occurs by the process of diffusion and entry of oxygen and exit of carbon dioxide occur through the spiracles.
Detailed explanation-2: -Oxygen passes to all the tissues through diffusion. D. Oxygen reaches tissues through tracheoles. Hint: Cockroach blood does not contain respiratory pigment it is due to the absence of haemoglobin in their blood.
Detailed explanation-3: -The insects have an open circulatory system, draw in air through external valves called spiracles and transport the air directly to the cells via tubes called trachea by diffusion.
Detailed explanation-4: -Note:-The hemolymph is generally colorless because no blood cells or respiratory pigments are present in them. Therefore cockroaches lack respiratory pigment.-Cockroaches lack hemoglobin in their blood so their body comprises white blood.