The middle lamella of a plant cell is primarily composed of which of the following?

In carbon monoxide $(CO)$,how are the carbon and oxygen atoms bonded?

The half-life of radioactive Radon is $3.8 \ days$. The time at the end of which $1/20^{th}$ of the Radon sample will remain undecayed is ............ $days$ (Given $\log_{10}e = 0.4343$)

The solution of $\tan y \frac{dy}{dx} = \sin(x+y) + \sin(x-y)$ is

The reagent used in the Wolff-Kishner reduction is

What is necessary for the maintenance of good health?