The value of the global Gross National Product $(GNP)$ is $..........$.

More than half of the earth's flora and fauna is found in

India shares about . . . . . . % of total biodiversity wealth on earth.

The biodiversity increases when one moves from the pioneer to the climax stage. What could be the explanation?

Among the classes of invertebrates that represent global biodiversity, which are the most abundant?

Identify the correct statements :
$1.$ According to $\text{IUCN} (2004)$,the total number of described species is slightly more than $1.5$ million.
$2.$ Robert May estimated the total species diversity on Earth to be around $7$ billion.
$3.$ Insects make up more than $70 \%$ of all recorded animal species.
$4.$ India,with $2.4 \%$ of the world's land area,contributes $8.1 \%$ to global species diversity.