Animal husbandry is the scientific management of
$(i)$ animal breeding
$(ii)$ culture of animals
$(iii)$ animal livestock
$(iv)$ rearing of animals

The major groups of activities for improving crop yields can be classified as:

Arrange these statements in the correct sequence for the preparation of green manure.
$(a)$ Green plants are decomposed in the soil.
$(b)$ Green plants are cultivated for preparing manure or crop plant parts are used.
$(c)$ Plants are ploughed and mixed into the soil.
$(d)$ After decomposition,it becomes green manure.

$(a)$ What is composite fish culture system?
$(b)$ Mention one merit and one demerit of this system.

Define the term organic farming. Write its four advantages.

Group the following crops and tabulate them as energy-yielding,protein-yielding,oil-yielding,and fodder crops: Wheat,rice,berseem,maize,gram,oat,pigeon pea,sudan grass,lentil,soybean,groundnut,castor,and mustard.