KCET · BIOLOGY · STD 12 - 11. Organisms and Populations

Identify the correct statement/s from the following
I. Cuscuta is a chlorophyllous endoparasite.
II. The human liverfluke needs only one host to complete its life cycle.
III. The life cycle of endoparasite is more complex due to their extreme specialisation.
IV. During the course of evolution the host bird's eggs have evolved to resemble the eggs of the parasitic bird.

A I, II, III
B II, IV
C Only III
D I, III and IV

Verified Solution

Answer & Solution

Correct Answer

(C) Only III

Step-by-step Solution

Detailed explanation

(C) Only III,
Incorrect statement are: Cuscuta is a parasitic plant. It has no chlorophyll for manufacturing its own food by photosynthesis. The human liverfluke requires two host to complete its life cycle. In brood parasitism, the parasitic bird's eggs have evolved to resemble the eggs of the host in size and colour to reduce the chances of the host bird detecting the foreign eggs and ejecting them from nest. The correct statement is that life-cycle of endo-parasite is more complex.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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