Biodiversity increases from

Approximately $25\%$ of all insects are known to be phytophagous (feeding on plant sap and other parts of plants).

Choose the incorrect sentence$(s)$ regarding latitudinal gradients.
$(I)$ Biodiversity throughout the world shows uneven distribution.
$(II)$ According to latitudinal gradient,there is no major difference in biodiversity.
$(III)$ Species diversity increases as we move away from the equator towards the poles.
$(IV)$ Biodiversity increases as we move from temperate to tropical regions.

Species diversity is bountiful in the tropics near the equator because of the following factors $EXCEPT$ . . . . . .

Which one of the following reasons is proposed for the greater species diversity in tropical environments compared to temperate ones?

$A$ species-area curve is drawn by plotting the number of species against the area. Why is the slope of the regression line steeper when a very large area (like an entire continent) is considered compared to smaller areas?