Who is known as the father of Indian Bryology?

The major product of the following reaction is:

If $f: \mathbb{R} \rightarrow \mathbb{R}$ is such that $f(x+y) = f(x) + f(y)$ for all $x, y \in \mathbb{R}$,$f(1) = 7$,and $\sum_{r=1}^n f(r) = 14112$,then $n = $

The solution of the differential equation $\frac{dy}{dx} = \frac{xy+y}{xy+x}$ is

If $y$ is a function of $x$ and $\log(x+y) = 2xy$,then the value of $y'(0)$ is

Three forces acting on a body are shown in the figure. To have the resultant force only along the $y-$ direction,the magnitude of the minimum additional force needed is.........$N$.