How many megadiverse countries are there in the world?

At one time,tropical rainforests covered more than $..........$ of the earth's land surface,but now they do not cover more than $..........$.

Which one of the following shows maximum genetic diversity in India?

How many countries pledged their commitment to achieve by $2010$,a significant reduction in the current rate of biodiversity loss at global,regional,and local levels in the World Summit held in $2002$?

Which of the following is considered a hot-spot of biodiversity in India?

In the equation $S = CA^z$,where $S =$ species richness,$A =$ area,$Z =$ slope of the line,and $C =$ $Y$-intercept. If area is on the $X$-axis and species richness is on the $Y$-axis,what will the graph of $S = CA^z$ look like?