If the cells of root in wheat plant have $42$ chromosomes, then the no. of chromosome in the cell of pollen grain is
$14$
$21$
$28$
$42$
Identify the structures marked $A$ to $F$ in the given diagram
How many pollen grains are formed from $10$ microspore mother cells by meiosis
Pollens outer layer is called ...$A$... This is made up of ...$B$.... This is absent on the ...$C$.... Fill in the blanks $A, B$ and $C$
$A$ : The generative cell comes to lie freely in the cytoplasm of the tube cell.
$R$ : Cellulosic wall around generative cell is dissolved.
Members of which plant family, pollen grains maintain viability for months ?