Out of boilers and layers,which one is used to produce eggs?

$(i)$ 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.

Which one of the following fish variety is a surface feeder?

What are the food requirements of dairy animals?

To solve the food problem of the country,which among the following is necessary?

How can genetically modified crops be obtained?