Question:
Given below are two statements:
Statement (i): Aedes aegypti contains no anti-coagulant and the blood clots in the stomach within 15 minutes of feeding.
Statement (ii): Aedes aegypti contains an anti-coagulant which prevents the blood clots in the stomach within 15 minutes of feeding.
In light of the above statements, choose the most appropriate answer from the options given below.
Given below are two statements:
Statement (i): Aedes aegypti contains no anti-coagulant and the blood clots in the stomach within 15 minutes of feeding.
Statement (ii): Aedes aegypti contains an anti-coagulant which prevents the blood clots in the stomach within 15 minutes of feeding.
In light of the above statements, choose the most appropriate answer from the options given below.
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Mosquito anti-coagulants are medically significant - they are being studied for potential cardiovascular applications.
Updated On: Jul 2, 2026
- Both Statement (i) and Statement (ii) are correct.
- Both Statement (i) and Statement (ii) are incorrect.
- Statement (i) is correct but Statement (ii) is incorrect.
- Statement (i) is incorrect but Statement (ii) is correct.
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The Correct Option is D
Approach Solution - 1
Aedes aegypti mosquitoes secrete an anti
coagulant in their saliva to prevent blood clotting during feeding
This anti
coagulant allows continuous blood flow for several minutes
Scientific studies confirm the presence of multiple anti
coagulant proteins in Aedes saliva
Therefore:
Statement (i) is incorrect
the mosquito does contain anti
coagulants
Statement (ii) is correct
these prevent clotting during feeding
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Approach Solution -2
Comparative physiology reasoning:
Nearly all blood-feeding arthropods face the same problem: vertebrate blood clots within minutes unless clotting is actively blocked. Mosquitoes, including Aedes aegypti, feed slowly and intermittently, probing tissue before locating a vessel, a process that would be impossible if the ingested blood clotted rapidly in the gut. To keep the meal fluid long enough to complete engorgement and digestion, their saliva delivers apyrase and other anticoagulant compounds into the host and the ingested blood. This universal need to keep blood liquid, common across mosquitoes and other haematophagous insects, confirms that Aedes aegypti does secrete an anticoagulant, contradicting Statement (i) and supporting Statement (ii).
Therefore, Statement (i) is incorrect and Statement (ii) is correct.
Nearly all blood-feeding arthropods face the same problem: vertebrate blood clots within minutes unless clotting is actively blocked. Mosquitoes, including Aedes aegypti, feed slowly and intermittently, probing tissue before locating a vessel, a process that would be impossible if the ingested blood clotted rapidly in the gut. To keep the meal fluid long enough to complete engorgement and digestion, their saliva delivers apyrase and other anticoagulant compounds into the host and the ingested blood. This universal need to keep blood liquid, common across mosquitoes and other haematophagous insects, confirms that Aedes aegypti does secrete an anticoagulant, contradicting Statement (i) and supporting Statement (ii).
Therefore, Statement (i) is incorrect and Statement (ii) is correct.
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