From which part of the plant is cocoa obtained from $Theobroma$ $cacao$?

What is the genomic constitution of old world varieties of cotton $(Gossypium \, arboreum, G. herbaceum)$ and new world varieties $(G. hirsutum, G. barbadense)$?

Who first studied the wheat rust problem in India?

Bhang is obtained from:

Which of the following is the most important rice-growing area in the world?

Wheat,paddy,and other cereals which form the staple food of mankind belong to the family: