sexual reproduction in flowering plant Flashcards
layers of microsporangium
epidermis
endothecium
middle layer
tapetum
microsporogenesis ?
formation of microspore tetrad from PMC by meiosis
male gametophyte
Pollen grain
layer walls of pollen grain
exine ,intine
cell layers of pollen grain
vegetative cell and generative cell
pollen viability of rice and wheat
30 min
eg for apocarpous
Michelin
pollen viability of rosacea, leguminoceae, solanaceae
for months
eg for syncarpous
papaver
integuments remain absent
micropyle
MMC ploidy?
2n
female gametophyte
Embryo sac
what is present at the chalazal end of embryo sac
3 antipodal cells
embryo sac formation from single megaspore?
monosporic development
cleistogamous, invariably autogamous eg,
viola[common pansy], oxalis, commelina
wind pollination common in?
grasses
genetic mechanism , outbreeding device
self incompatibility
continued self pollination results in
inbreeding depressions
male gamete with egg
2n zygote
male gamete with polar nuclei
3n PEN
event unique to flowering plants
double fertilisation [syngamy + triple fusion]
——– development precedes embryo development
endosperm development
ploidy of endosperm
3n
steps of zygote formation in dicots
pro embryo
globular
heart shaped
mature embryo
eg of non albuminous
pea, groundnut
eg of albuminous
wheat ,maize ,barley, castor, coconut
define perisperm with eg
remnants of nucellus persistent eg, black pepper and beet
eg of false fruit
apple, strawberry, cashew
produce fruit without fertilisation
parthenocarpic
produce seeds without fertilisation
apomixis
eg of polyembryony
citrus and ,mango
