CUET · BIOLOGY · PYQ PAPER 2025

Which one of the following cause of biodiversity loss is reflected in the phrase "need turns to greed"?

A Habitat loss and fragmentation
B Over-exploitation
C Alien species invasion
D Co-extinctions

Verified Solution

Answer & Solution

Correct Answer

(B) Over-exploitation

Step-by-step Solution

Detailed explanation

Over-exploitation

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

LIST – I (Transition metal ion)	LIST – II (Property)
(A) \(Mn ^{3+}\)	(I) \(3 d^6\), green
(B) \(Fe ^{2+}\)	(II) \(3 d^4\), violet
(C) \(Ti ^{4+}\)	(III) \(3 d^0\), colourless
(D) \(V ^{2+}\)	(IV) \(3 d^3\), violet

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When radiation is incident on a metal surface of work function \( \Phi_0 \), photoelectrons are emitted with some maximum kinetic energy \( K \). If the frequency of the incident radiation is doubled, then the maximum kinetic energy of the emitted photoelectrons will become

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x	\(0\)	\(1\)	\(2\)	\(3\)	\(4\)	\(5\)
\(P(X)\)	\[3k\]	\(3k\)	\(2k\)	\(2k^2\)	\(3k^2\)	\(4k^2\)