placentation -flower Flashcards
where are ovules and where are they attached
ovary,placenta
placentation
arrangement of ovules/placenta on ovary wall or arrangement of seed in fruit
types of placentation
marginal placentation parietal placentation axile placentation free central placentation basal placentation superficial placentation
marginal placentation
no true placenta placenta on ventral surface ovules arranged in 2 rows found in monocarpellary gynoecium like pea
parietal placentation
syncarpous
pollycarpellary
unilocular ovary
placenta at place of union of carpels
exception to parietal placentation
mustard (bicarpellary , parietal placentation but to septum that is the false septum(Reptum ) it us bilocular insteadcof unilocular )
why is reptum the false septum
made from thalamus not from ovary wall
eg of parietal placentation
cruciferae
cucurbitacae
argemone
axile placentation
multicarpellary , syncarpous gynoecium and multilocular ovary
placenta at central axis where septa fused
no. of carpel= no. of ovule
eg axile placentation
china rose, bhindi , brinjal (fleshy placenta ), tomato
free central placentation eg .
dianthus and primrose
free central placentation
ovules on central axis
multicarpellary
syncarpous gynoecium
unilocular ovary
basal placentation eg
compositae or astraceae (sunflower)
wheat (poacea or graminae )
basal placentation
unilocular ovary
single ovule at the base of the ovary
superficial placentation. eg .
Nymphae(water lily )
