When you're ask to describe the development of a pollen grain from a microspore mother cell is it enough to just draw a labelled diagram or must you write a paragraph with it explaining what's happening?
To answer your question, I would give the whole description of what happens, unless specifically told otherwise. Something along the lines of this should do:
so you basically have two flowers, and the male one releases a pollen grain from the anther. This lands on the female carpel, and divides into the tube nucleus and generative nucleus. The tube nucleus 'digs' a tube inside the style, through the ovary and up to the ovule. The generative nucleus follows on and divides to form two haploid nuclei, of which one will fertilise the egg cell (n), and the other the 2 polar nuclei (n). The polar nuclei will become an endosperm nucleus (3n). This is the only section of the course where you will ever hear of a 'triploid nucleus'!! The endosperm eventually becomes the food store for the germinating seed. The fertilised egg cell forms the seed, which will then germinate to produce a new plant.
This should get you full marks. Best of luck with the study!
if the question just says 'describe' then either a paragraph OR a suitable diagram or series of diagrams could be fine!! If it says, 'describe using diagrams' then diagrams MUST be included and full marks can not be obtained if they are omitted. Recently questions have said 'diagrams alone will not be sufficient' or similar, in which case you MUST include a relevant paragraph.