The function of endothecium is
Nutritional
Mechanical support
Dehiscence
Protection
Meiotic cell division takes place during
Which one of the following is resistant to enzyme action?
Identify labelled part $'X'$ from the figure :
Which of the following has proved helpful in preserving pollen as fossils?
If the cells of root in wheat plant have $42$ chromosomes, then the no. of chromosome in the cell of pollen grain is