CUET · BIOLOGY · PYQ PAPER 2025

Identify the incorrect fact about genetic modification.

A Crops are made more tolerant to abiotic stresses (cold, drought, salt, heat)
B Increase in efficiency of mineral usage by plants
C Help to reduce post harvest losses
D Increase in reliance on chemical pesticides (pest-resistant crops)

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Answer & Solution

Correct Answer

(D) Increase in reliance on chemical pesticides (pest-resistant crops)

Step-by-step Solution

Detailed explanation

Increase in reliance on chemical pesticides (pest-resistant crops)

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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Match List-I with List-II (Symbols have their usual meanings)

List-I (Physical Quantity)	List-II (Expression)
(A) Current density	(I) \( \frac{e E \tau}{m} \)
(B) Drift velocity	(II) \( \frac{n e^2 \tau}{m} \)
(C) Conductivity	(III) \( \frac{e \tau}{m} \)
(D) Mobility	(IV) \( n e v_d \)

Choose the correct answer from the options given below:

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List-I (Terms)	List-II (Features)
(A) Natality	(I) Exit of individuals
(B) Mortality	(II) Entry of individuals
(C) Immigration	(III) Death rate
(D) Emigration	(IV) Birth rate

List - I (Name of extinct Animal)	List - II (Name of the country)
(A) Steller's Sea Cow	(i) Mauritius
(B) Dodo	(ii) Africa
(C) Thylacine	(iii) Russia
(D) Quagga	(iv) Australia