What percentage of the world's total land area does India occupy (in $\%$)?

What percentage of the world population lives in India (in $\%$)?

How do ecologists estimate the total number of species present in the world?

According to the world population, India is placed at which position?

India has much of its land area in the $\underline {i}$ and possesses more than $\underline {ii}$ species of birds.

Give the correct descending order of organisms with reference to their estimated number found in the Amazon rainforest:
$(a)$ Plants
$(b)$ Invertebrates
$(c)$ Fishes
$(d)$ Mammals
$(e)$ Birds
Choose the correct answer from the options given below: