Which part of the tobacco plant is infected by the nematode $Meloidogyne \ incognita$?

Which of the following alkenes does $NOT$ exhibit $cis-trans$ isomerism?

The layer of the uterus which becomes much eroded due to placental villi is known as

The value of $a$ such that $f(x) = \sqrt{3} \sin x - \cos x - 2ax + b$ decreases for all real values of $x$ is given by:

At $T(K)$,$100 \ L$ of dry oxygen is present in a sealed container. It is subjected to silent electric discharge,till the volumes of oxygen and ozone become equal. What is the volume (in litres) of ozone formed at $T(K)$?

In a triangle,if $b=20, c=21$ and $\sin A=\frac{3}{5}$,then $a$ is equal to :