Who first suggested the idea of circular flow of genetic information?

In any $\triangle ABC$,the expression $\frac{(a+b+c)(b+c-a)(c+a-b)(a+b-c)}{4b^2c^2}$ is equal to:

Which one of the following is used in the preparation of cellulose nitrate?

Select the correct statement $:-$

Two point charges $+8q$ and $-2q$ are located at $x = 0$ and $x = L$ respectively. The location of a point on the $x$-axis at which the net electric field due to these two point charges is zero is

Which combination of tissues acts together to provide support to the hypocotyl of a seedling?