PISTIL ,OVULE
GYNOECIUM- female reprouctive part of a flower.
PISTIL / CARPEL- individual units of gynoecium
MONOCARPELLARY- gynoecium with single carpel
MULTICAROPELLARY- gynoecium with more than one carpel.
SYNCARPOUS - carpels fused.
APOCARPOUS - carpals free
parts of a pistil
OVARY-basal bulged part with ovarian cavity ,placenta and ovules
no of ovules may be one (eg wheat , paddy and mango)or many (papaya, watermelon and orchids)
STYLE-elongated slender part above ovary
STIGMA-upper receptive surface( landing place for pollengrains)
MEGASPORANGIUM OR OVULE
FUNICLE- stalk of the ovule
HILUM- point of attachment of funice with the body of the ovule
INTEGUMENTS- protective envelops of ovule
MICROPYLE - small opening present on integuments
NUCELLUS-body of the ovule with abundant reserve food materials-.nucellus encloses a single embryosac in it
CHALAZA - basal part of the ovary opposite to micropylar end .
MEGASPOROGENESIS.
Process of formation of megaspores from megaspoe mother cell(diploid 2n)
single megaspore mother cell at the micropylar region with dense cytoplasm and prominent nucleus undergoes meiosis and produces four haploid megaspores , one of them become functional and 3 degenerate .
functional megaspore undergoes mitosis and produces 2-4-8 nuclei
EGG APPARATUS - 3cells at the micropylar end with one EGG cell and 3 SYNERGIDS ynergids contain special cellular thickening called FILIFORM APPARATUS which guide the polllen tube into the synergids '
ANTIPODALS -three cells at the chalazal end
2 nuclei Situated in a large centrall cell called POLAR NUCLEI
amature embryosac is 7 celled and 8 nucleate
