Select the letter from among the given options that can replace the question mark (?) in the following series.

P, N, J, H, ?

The edible part of mango is:

Photorespiration involves

Which soil has highest water use efficiency?

Nymphs of red cotton bug also damage ...............................................?

Which one is cole-crop:

Tillering habit is more common is cereals except 

The deficiency symptom of which of the following nutrient first appears on terminal bud of the plants is

Parboiling of rice is a:

The herbicides which are ineffective on perennial plants that are able to regrow from roots or tubers.

Varietal purity is checked by