Make the correct pair :
Column $- I$ | Column $- II$ |
A- Tapetum | i- Degenerate during development |
B- Intine | ii- Resistant organic materials |
C- Vegetative cell | iii- Pollen tube |
D- Sporopollenin | iv- Provide nourishment to pollen grains |
$(A-iv) (B-iii) (C-ii) (D-i)$
$(A-ii) (B-iv) (C-i) (D-iii)$
$(A-iv) (B-iii) (C-i) (D-ii)$
$(A-iii) (B-i) (C-iv) (D-ii)$
Assertion : If pollen mother cells has $42$ chromosomes, the pollen has only $21$ chromosomes.
Reason : Pollens are formed after meiosis in pollen mother cell.
Mature male gametophyte is derived from a 'pollen mother cell' by
Identify $A$ and $B$ in diagram given below:
Describe internal structure of anther by mentioning about typical stamen.
Which one of the following is resistant to enzyme action?