CUET · BIOLOGY · PYQ PAPER 2025

Copper T is used as an Intra Uterine Device (IUD) for contraception. Identify
the correct statement for its mode of action
(A) It is made up of ionized copper.
(B) It releases Cu ions that suppress sperm motility.
(C) It makes the uterus unsuitable for implantation.
(D) It decreases sperm phagocytosis within the uterus.

A (A), (B) and (D) only
B (A), (B) and (C) only
C (A), (B), (C) and (D)
D (B), (C) and (D) only

Verified Solution

Answer & Solution

Correct Answer

(D) (B), (C) and (D) only

Step-by-step Solution

Detailed explanation

(B), (C) and (D) only

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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Choose the correct answer from the options given below :

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List-l (Species)	List-II (Population interaction terms)
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