Plant Reproduction Flashcards
what is male part called and what is it made up of
called stamen made up of filament and anther
what is female part called and what is its made up of
called carpel made up of stigma style and ovary
what is the ovule
ovule is contained in the ovary which devolopes into embryo sac (megaspore) where egg develops
explain female reproduction system
one megaspore will undergo meiosis where it will produce 4 tabloid cells. 3 will die and degenerate leaving one left. this one left is know known as the embryo sac. its nucleus will the undergo mitosis 3 times to produce embryo sac with 8 habloid nuclei. 6 off the nuclei will surround its own membrane and 2 will not. 5 will then degenerate and die leaving only one to become the egg cell and the two nuclei that didn’t surround membrane will become the polar nuclei
explain pollen grain formation
the male part of flower has two parts the filament and the anther. the anther is divided into 4 sections known as the pollen sacs. pollen sacs are lined by the tapetum with provides nourishment. inside pollen sacs is the microspore mother cells. each mother cell undergoes meoisis which produces tetrad of 4 habloid cells. the cells then undergo mitosis to produce pollen grain with 2 nuclei. one is called tube nucleus and the other called generative nucleus. this generative nucleus then undergoes mitosis to form male gamete which normally takes place after pollination. it is then transported by wind or insects
2 methods of cross pollination
wind / insects
site of production for pollen grain
anther
where on plant should pollination land on
stigma
which part of plant turns into fruit
ovary
what does generative nucleus do
its undergoes mitosis to form 2 male gametes normally after pollination
role of petal/ anther / stigma / sepal
attracts insects / pollen releases here / pollens lands on it / protects flower
what does male gamer fuse in embryo sac
egg
what does fertilisation mean
fusion of male gamete with female egg cell
what is pollination
the transfer of pollen from anther to stigma
what happens at the first fetillisation
the nuclei enters the embryo sac and fertilisation takes place to produce a diploid zygote which becomes the embryo plant
