Why should biological control methods be preferred for protecting crops?

Which of the following are Indian cattle?
$(i)$ Bos indicus
$(ii)$ Bos domestica
$(iii)$ Bos bubalis
$(iv)$ Bos vulgaris

Why is excess use of fertilizers detrimental for the environment?

$(i)$ 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.

$(i)$ Mr. Ramdin,an educated farmer,convinces his friends to use fertilizers judiciously. Why?
$(ii)$ Which two values of Ramdin impress you?

Ram's teacher was showing the structure of a cell under a compound microscope,highlighting different parts like the cell wall,cell membrane,and nucleus. The teacher explained the difference between plant and animal cells,noting that the cell wall is found only in plant cells. Everyone observed the structure carefully and understood its structural importance.
$(a)$ What kind of qualities are shown by Ram?
$(b)$ Why is the cell called the structural and functional unit of life?