Which one of the following fertilizers is the cheapest source of nitrogen based on its per unit value?

It consists of a series of platforms having suitable vertical drops along contours or on suitable graded lines across the general slope of the land.

Which of the following crop has the highest genetic yield potential among the food grain crops?

Cattle belong to which family?

Agricultural Economics is related to:

Paul Leagans model of communication has how many elements?

Biological equilibrium is equilibrium amongst

Which vitamin is essential for clear vision in dim light and whose deficiency causes night blindness?

The vitamin that helps in blood clotting is

Identify the renewable source of energy from the following

The term which denotes the transfer of food energy from one trophic level to another is