The forests play an important role in the well-being of seven billion inhabitants of the world,of which ........... people directly depend on forests for their livelihood.

The measure of the variety of species and their relative abundance present within a region is referred to as

Tropical regions show the greatest level of species richness because:
$A$. Tropical latitudes have remained relatively undisturbed for millions of years,hence more time was available for species diversification.
$B$. Tropical environments are more seasonal.
$C$. More solar energy is available in the tropics.
$D$. Constant environments promote niche specialization.
$E$. Tropical environments are constant and predictable.
Choose the correct answer from the options given below.

How many biodiversity hotspots are there in the world?

Distinguish between: Species Diversity and Ecosystem Diversity.

Match the following with respect to different categories of the red list. Choose the correct option.

Column-$I$	Column-$II$
$i$. Extinct	$a$. Species whose members survive only in captivity.
$ii$. Extinct in wild	$b$. Rapid population decline of $50\%$ to more than $70\%$ over the previous $10$ years.
$iii$. Endangered	$c$. Species in which the last individual has died.
$iv$. Vulnerable	$d$. Rapid population decline of $30\%$ to more than $50\%$ over the previous $10$ years.