Match List-I with List - II and choose the correct answer from the options given below.

List - I	List - II
(a) Allen's Rule	(i) Kangaroo rat
(b) Physiological adaptation	(ii) Desert lizard
(c) Behavioural adaptation	(iii) Marine fish at depth
(d) Biochemical adaptation	(iv) Polar seal

The correct option is a - iv, b - i, c - ii, d - iii.

Let us analyze and match each item from List-I with its corresponding adaptation in List-II:

(a) Allen's Rule matches with (iv) Polar seal:
Allen's Rule states that mammals from colder climates generally have shorter ears and limbs to minimize heat loss. Polar seals have a thick layer of fat (blubber) below their skin and reduced extremity sizes, which helps in conserving body heat in freezing polar waters.

(b) Physiological adaptation matches with (i) Kangaroo rat:
The Kangaroo rat of North American deserts exhibits a physiological adaptation where it meets all its water requirements through internal fat oxidation (which produces water as a byproduct). It also has the ability to concentrate its urine to a minimal volume to conserve water.

(c) Behavioural adaptation matches with (ii) Desert lizard:
Desert lizards lack the physiological ability to cope with high temperatures. Instead, they manage their body temperature behaviorally. They bask in the sun and absorb heat when their body temperature drops below the comfort zone, and move into shade when the ambient temperature starts increasing.

(d) Biochemical adaptation matches with (iii) Marine fish at depth:
Marine invertebrates and fish living at great depths in the ocean experience pressures that are more than 100 times the normal atmospheric pressure. They possess biochemical adaptations (such as specialized enzymes and membrane lipids) that allow their cellular processes to function normally under such extreme hydrostatic pressure.

Combining these matches, we get:
(a) - (iv)
(b) - (i)
(c) - (ii)
(d) - (iii)