Mention two advantages of animal husbandry.

Match the following Column $A$ and Column $B$:

Column $A$	Column $B$
$(a)$ Cattle used for tilling and carting	$(i)$ Milk producing female
$(b)$ Indian breed of chicken	$(ii)$ Broiler
$(c)$ Sahiwal,Red Sindhi	$(iii)$ Draught animals
$(d)$ Milch	$(iv)$ Local breed of cattle
$(e)$ Chicken better fed for obtaining meat	$(v)$ Aseel

What do you understand by composite fish culture?

Write two examples each of the fishes that are:
$(i)$ Top dwellers
$(ii)$ Middle dwellers
$(iii)$ Bottom dwellers,in composite fish culture.

$(i)$ Poultry is India's most efficient converter of low-fibre foodstuff into highly nutritious animal protein food. Justify the statement.
$(ii)$ What do we call the birds which are reared for eggs and those which are reared for meat?
$(iii)$ Name one indigenous and one exotic breed of poultry.

Dalton was the first scientist to use symbols for elements. Chemical symbols act as a vocabulary of chemical language. Chemical symbols are used to describe chemical changes with clarity and precision. Chemical symbols help in identifying specific elements. Chemical symbols also represent an atom of a particular element. Chemical symbols also signify the atomic mass of an element.
$(a)$ How do symbols help in identifying specific elements?
$(b)$ How do we use symbols in daily life for our convenience?
$(c)$ What values do you find in using symbols?