Odd Man Out

Each of the given numbers is a prime number. But the number obtained on reversing the digits of each of the numbers except 23, is also a prime number.

All except Flower are types of plants.

In all other pairs, the two words denote things which serve the same purpose.

All except Chilli are modified stems.

In all other groups, the consecutive letters are arranged alternately.

Kiwi is the only flightless bird in the group.

In all other pairs, the second number is obtained by multiplying the square of the first number by a prime number.Thus, 108 = 6² × 3, 75 = 5² × 3, 99 = 3² × 11.

In all other pairs, first is the raw material used to make the second.

In all other pairs, only the first five letters of the first element are rearranged in the second element while the sixth letter remains unaltered.

All except Veil cover the head, while veil covers the face.