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Biology · 2022 · 3 marks
CBSE 2022 · Region 2 · Set 1 · Q7
When Plasmodium sp. (malarial parasite) enters the human body, it reproduces asexually and increases its number. During this course, the affected…
When Plasmodium sp. (malarial parasite) enters the human body, it reproduces asexually and increases its number. During this course, the affected person suffers from malaria. After a number of asexual cycles, the parasite, in order to complete its life cycle, enters the sexual phase of its life. Trace the sexual stages in the life cycle of Plasmodium in a female Anopheles mosquito, when it bites an infected person, up to the formation of mature infective stages of the parasite.
Marking-scheme solution
Sexual Stage (gametocytes) develop in RBC, gametocytes are taken by female Anopheles mosquito with blood meal, fertilisation and development take place in the mosquito's gut, mature infective stages (sporozoites) escape from gut, migrate to mosquito's salivary glands, when the mosquito bites another human sporozoites are injected with bite
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CBSE Class 12 Biology past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.