Why is $Van Mahotsav$ celebrated?

Which of the following are the causes for deforestation?
$I.$ Human settlements
$II.$ Forest fires
$III.$ Hydroelectric projects
$IV.$ Overgrazing by livestock
$V.$ Demand of wood
Which of the statements given above are correct?

In recent years,there has been an increasing incidence of floods in the plains of northern India because

Deforestation has an alarming effect on

Deforestation generally decreases $.......$.

State the consequences of deforestation.