Skin, Eye, Nose and Ear are sensory organs, while Leg is a limb.

Brick, Cement and Sand are the raw materials for the building a Wall.

Glacier is a mass of ice. But others are different.

All except Tomato grow underground.

Except iodine rest are metals while iodine is non metal.

Second number is a result of square and then addition of first number except for option d

K⁺²M⁺¹N^-2L, P⁺²R⁺¹S^-2Q, V⁺¹W⁺²Y⁺¹Z, J⁺²L⁺¹M^-2K and W⁺²Y⁺¹Z^-2X.

Each of the numbers except 72 is a perfect square.

Except fox rest are pets.

All options are pair of antonyms expect for option C.

A, E, I  are vowels, while R is a consonant.