Depending upon the immediate urgency of the need to conserve biodiversity, arrange the options given below in a descending order.

(A) Hot spots
(B) Sacred groves
(C) Ex situ method
(D) Bioreserves

Choose the most appropriate answer from the options given below.

(C), (B), (D), (A)

The correct answer is Option (4) → (C), (B), (D), (A) 

Ex situ methods (C)

• These are considered most urgent because they are the last resort. If a species is on the verge of extinction (e.g., Cheetah, endangered plants), we can’t wait for hotspot/biosphere protection. So urgent action is gene banking, cryopreservation, botanical gardens, zoos → placed first.

Sacred groves (B)

• Traditional community-protected patches of forest.They conserve rare species effectively at small scale. Immediate protection exists, so next in urgency.

Bioreserves (D)

• Large government-protected areas. Threat is less immediate because legal protection is already there.

Hotspots (A)

• Although biologically richest and highly threatened, many textbooks and exam keys consider them long-term conservation goals rather than "immediate urgency," since they cover vast regions needing global coordination (not short-term emergency action).

That’s why the given correct answer is Option 4 (C, B, D, A).