What are the desirable agronomic characteristics for crop improvement?

Cereals should be dwarf, but with large ears. Dwarfness makes their stem stronger. They can withstand strong winds and their nutrient requirement is also less. Large ears produce more grains. 

Fodder crops meant for feeding cattle must have profuse branching, good foliage, juicy stems and large size.

Legumes should have more pods which generally develop in relation to stem branching. Therefore, more branching and good foliage increase their productivity. 

This includes increased resistance against pests. 

Hence, the correct answer is option D.