According to ecologists,what is the value of $Z$ in the species-area relationship equation $\log \, S = \log \, C + Z \, \log \, A$?

Given $S =$ 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 $\log S = \log C + Z \log A$ look like?

Ecologists have discovered that the value of the $Z$ line in a small area is $....P....$ and the value of the $Z$ line in a very large area is $.....Q....$.

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.

For which of the following will the slope of the $Z$ line be steeper?

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