The oil-yielding plant among the following is:

What are the desirable agronomic characteristics for crop improvements?

Differentiate between manures and fertilizers.

Fill in the blanks:
$(a)$ Photoperiod affects the . . . . . . .
$(b)$ Kharif crops are cultivated from . . . . . . to . . . . . . .
$(c)$ Rabi crops are cultivated from . . . . . . to . . . . . . .
$(d)$ Paddy,maize,green gram,and black gram are . . . . . . crops.
$(e)$ Wheat,gram,pea,and mustard are . . . . . . crops.

Write the name of a bio-fertilizer.

Why is organic matter important for crop production?