If there were $50$ species of reptile present in one ecosystem,what is this called?

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.

Developing or underdeveloped nations are rich in which of the following aspects?

Which of the following has maximum genetic diversity in India?

Select the correct option regarding species diversity.

Which ecosystem shows maximum genetic diversity?