How do plants get nutrients?

How do good animal husbandry practices benefit farmers?

What is genetic manipulation? How is it useful in agricultural practices?

Why should preventive measures and biological control methods be preferred for protecting crops?

Discuss the implications of the following statement:
"It is interesting to note that poultry is India's most efficient converter of low fibre food stuff (which is unfit for human consumption) into highly nutritious animal protein food."

For increasing production,what is common in poultry,fisheries and bee-keeping?