Question

Assertion :Malarial fever appears at the merozoite stage of Plasmodium. Reason: The infective stage of Plasmodium is sporozoite.

• A. Both the assertion and the reason are true and the reason is a correct explanation of the assertion
• B. Both the assertion and reason are true but the reason is not a correct explanation of the assertion
• C. The assertion is true but the reason is false
• D. Both the assertion and reason are false

Answer 1

The correct option is B Both the assertion and reason are true but the reason is not a correct explanation of the assertion

When the mosquito bites man, sporozoites Present in the salivary gland of female Anopheles mosquito are injected into the blood of the man. The erythrocyte schizont gives rise to merozoites. Malaria fever occurs when schizonts in red blood corpuscles burst and set free their contained merozoites and malarial pigment (hemozoin) in the blood plasma. Bursting of schizonts tends to be synchronous as they all burst at the same time. Hemozoin is said to be toxic and so includes high fever and shivering (Hemozoin is an unused homo tin, which is produced by the breakdown of haemoglobin.) It is yellow-brown to blackish in colour.

So the correct option is 'both the assertion and reason are true but the reason is not a correct explanation of the assertion'.