plant reproduction Flashcards
1
Q
how does pollen grain from in the anther
A
Meiosis of dipolid microscope cells in the anther form 4 haploid microscopes .
Haploid microscopes mature into pollen grains via mitosis
2
Q
Describe the structure of pollen grains
A
Generative cell with hapolid nucleus produces 2 male gametes via mitosis ,pollen tube elongates to penetrate ovule ,forming an outer protective coating
3
Q
How does the embryo sac form in the ovule
A
Mitosis of dipolid megaspore cells in the ovule forms 1 ootid 3 polar bodies (polar bodies degenrate and are reabsored )
After 3 mitotic divisions ,ootid forms embryo sac
4
Q
Describe the strutre of the embryo sac
A
2 polar nuclei form endosperm
Ovum forms zygote
2 synergids
3 antipodial cells
