sexual reproduction in flowering plant Flashcards by Zainab Mahawish

Q

layers of microsporangium

A

epidermis
endothecium
middle layer
tapetum

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Q

microsporogenesis ?

A

formation of microspore tetrad from PMC by meiosis

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Q

male gametophyte

A

Pollen grain

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Q

layer walls of pollen grain

A

exine ,intine

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Q

cell layers of pollen grain

A

vegetative cell and generative cell

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Q

pollen viability of rice and wheat

A

30 min

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Q

eg for apocarpous

A

Michelin

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Q

pollen viability of rosacea, leguminoceae, solanaceae

A

for months

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Q

eg for syncarpous

A

papaver

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Q

integuments remain absent

A

micropyle

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Q

MMC ploidy?

A

2n

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Q

female gametophyte

A

Embryo sac

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Q

what is present at the chalazal end of embryo sac

A

3 antipodal cells

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Q

embryo sac formation from single megaspore?

A

monosporic development

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Q

cleistogamous, invariably autogamous eg,

A

viola[common pansy], oxalis, commelina

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Q

wind pollination common in?

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A

grasses

Q

genetic mechanism , outbreeding device

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A

self incompatibility

Q

continued self pollination results in

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A

inbreeding depressions

Q

male gamete with egg

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A

2n zygote

Q

male gamete with polar nuclei

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A

3n PEN

Q

event unique to flowering plants

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A

double fertilisation [syngamy + triple fusion]

Q

——– development precedes embryo development

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A

endosperm development

Q

ploidy of endosperm

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A

3n

Q

steps of zygote formation in dicots

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A

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