The mouth part of a mosquito through which it sucks the blood of its victim is called

Analyze the question: The question asks for the part of the mosquito's mouthparts through which blood is sucked up.

Concept: A female mosquito has piercing-sucking mouthparts that form a long proboscis. The parts are:

• Labium: the outer sheath that supports and protects the other parts. It is not inserted into the skin and does not carry the blood.
• Labrum: a long, tube-like structure (the labrum-epipharynx) that forms the food channel. It is grooved and closed by the other stylets to make a tube, and blood travels up through it.
• Mandibles and maxillae: needle-like stylets that cut and pierce the skin.
• Hypopharynx: carries saliva (with anticoagulant) down into the wound.

Step by step:

1. The mandibles and maxillae pierce the skin.
2. The hypopharynx injects saliva to stop the blood from clotting.
3. The labrum forms the tube through which blood is drawn up into the mosquito's gut.
4. The labium simply sheathes the whole set.

Checking the options:

• A. Hypopharynx: delivers saliva, not blood.
• B. Mandible: pierces the skin.
• C. Labium: a sheath.
• D. Labrum: the food canal that sucks blood. ✔
• E. Stylet: a general term for the piercing needles as a group, not the specific part that sucks the blood.

Tip: Remember "Labrum = Liquid up" (blood goes up the labrum), and "Hypopharynx = Helps blood flow (saliva goes down)". Pair them as in and out: saliva down the hypopharynx, blood up the labrum.