In angiosperms,the functional megaspore develops into which of the following?

Human urine is usually acidic because:

Which of the following was isolated and identified by Skoog and Miller?

The solution of the differential equation $\frac{dy}{dx} + \frac{3x^2}{1+x^3}y = \frac{\sin^2 x}{1+x^3}$ is

The oxidation states of $S$ atoms in Caro's and Marshall's acids are

In the reaction: $P + Q \longrightarrow R + S$,the time taken for $75\%$ reaction of $P$ is twice the time taken for $50\%$ reaction of $P$. The concentration of $Q$ varies with reaction time as shown in the figure. The overall order of the reaction is: