When $FeCl_3$ reacts with $K_4[Fe(CN)_6]$,which of the following compounds is formed?

Which of the following pairs is correctly matched?
$(i)$. Fungi - Regeneration
$(ii)$. Mosses - Fragmentation
$(iii)$. Planaria - Budding

Which of the following characteristics belongs to the Kingdom Animalia?

If the function $y = \sin^{-1} x$, then $(1 - x^2) \frac{d^2 y}{d x^2}$ is equal to

In the Young's double slit experiment,the intensities at two points $P_1$ and $P_2$ on the screen are respectively $I_1$ and $I_2$. If $P_1$ is located at the centre of a bright fringe and $P_2$ is located at a distance equal to a quarter of fringe width from $P_1$,then $I_1/I_2$ is:

The spectrum of a black body at two temperatures $27^oC$ and $327^oC$ is shown in the figure. Let $A_1$ and $A_2$ be the areas under the two curves respectively. The value of $\frac{A_2}{A_1}$ is