Leaves that produce microspores and megaspores are called:

Who discovered the mutagenic effect of $X$-rays?

What is a capsomere?

The number of natural numbers less than $1000$,in which no two digits are repeated,is:

If $k > 1$ and the determinant of the matrix $A^2$,where $A = \begin{bmatrix} k & k\alpha & \alpha \\ 0 & \alpha & k\alpha \\ 0 & 0 & k \end{bmatrix}$,is $k^2$,then $|\alpha|$ is equal to

When $NaCl$ is dissolved in water,the sodium ion becomes