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

Provide the definitions/explanations for the following:
$(i)$ In-situ conservation
$(ii)$ Biodiversity

What is the full form of $UNESCO$?

Spot out the zone of our country considered as the hot spot of biodiversity and regarded as the "Cradle of Speciation".

The largely tropical ............. rain forest in South America has the greatest biodiversity on earth.

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.