CUET · BIOLOGY · PYQ PAPER 2025

A combination of progestogen-estrogen is used in:

A Condoms
B Emergency contraceptives pills or IUDs
C Spermicidal creams
D Copper releasing IUDs

Verified Solution

Answer & Solution

Correct Answer

(B) Emergency contraceptives pills or IUDs

Step-by-step Solution

Detailed explanation

Emergency contraceptives pills or IUDs

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.

Same subject

Match List-I with List-II

List-I (Characteristics)	List-II (Examples)
(A) Symbiotic association with roots of leguminous plants	(I) Glomus
(B) Fixes atmospheric nitrogen while free living in the soil	(II) Rhizobium
(C) Symbiotic association of fungi and plants	(III) Anabaena
(D) Cyanobacteria which can fix atmospheric nitrogen	(IV) Azotobacte

Choose the correct answer from the options given below:

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List - I	List - II
(A) Cleistogamous flowers	(I) Water pollinated flowers
(B) Vallisneria	(II) Tallest flower
(C) Amorphophallus	(III) Dioecious
(D) Papaya	(IV) Do not open at all

LIST I	LIST II
A. Anaerobic sludge digestor	I. Secondary treatment
B. Primary sludge	II. Activated sludge
C. Change in BOD	III. Primary treatment
D. Bacterial flocs	IV. Biogas

LIST I	LIST II
(A) Ribosome	(I) Replication
(B) Histone	(II) Transcription
(C) DNA polymerase	(III) Translation
(D) RNA polymerase	(IV) Nucleosome