$(a)$ Give two examples of shellfishes.
$(b)$ Mention the names of four marine fish of high economic value.

Write four methods of weed control.

Which one of the following nutrients is not available in fertilizers?

In agricultural practices,higher input gives higher yield. Discuss how?

The housing, nutritional and environmental requirements of broilers are somewhat different from those of egg layers.

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.