Identify two crops from the following which provide us carbohydrates for energy requirement:
Black gram,Wheat,Lentil,Rice

$(i)$ What are weeds? Give two examples.
$(ii)$ "Removal of weeds from cultivated fields during the early stages of growth of crops is essential for a good harvest." Justify the statement.
$(iii)$ List five preventive methods that help in weed control.

What do you understand by composite fish culture?

Freshwater resources include canals,ponds,reservoirs and rivers.

Differentiate between layers and broilers.

Name the major nutrient which we get from fish.