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Biology · 2023 · 4 marks
CBSE 2023 · Region 3 · Set 1 · Q30
The diagram shows the life cycle of a pathogenic protozoan. (i) Name the parasitic stage that is being transferred from host 'X' to host 'Y'. (ii)…
The diagram shows the life cycle of a pathogenic protozoan.
(i)
Name the parasitic stage that is being transferred from host 'X' to host 'Y'.
(ii)
Write the changes the parasite undergoes in the liver.
(iii)
Write the changes the parasite undergoes when it enters the RBC.
(iv)
(a)
Trace the changes the parasite undergoes when the host 'X' takes its blood meal from infected host 'Y'.
OR
(b)
At which stage during the life cycle of the pathogen does the host 'Y' experience the symptoms of the disease ? Name the disease and the toxic substance responsible for these symptoms.
Marking-scheme solution
(i)
Sporozoites.
(ii)
Undergoes Asexual reproduction
(iii)
The number increase asexually, parasites ultimately change into gametocytes/ undergoes gametogenesis
(iv)
(a)
Fertilisation and development_takes place in host 'X', ultimately forming the infective stage sporozoites.
OR
(b)
Bursting of RBCs
Malaria
Haemozoin
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CBSE Class 12 Biology past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.