Science test at tuition....bleukkkkk=(

Science test at tuition.......it's confusing me !

What's the importance of the ovule and the pollen grains to the flower?

I wrote : So that fertilization will occur.

What's the process of the pollen tube growing down to the style and what's the result after that?

I wrote: The process is called growth of pollen tubes.(I never learnt about the process, do i?)Fertilization will occur as the fusion of both male and female gametes happen.

My target was to get more than 90% and above. But, I think I lost 13 marks and propably I'll managed to get only 87%! Haiz....gotta put in more efforts on my Science for this coming exam at my school....Oh! My God! =)