sexual reproduction in flowering plant

worl of stamen

anther is bilobes in structure

two theca called Dithecous seperated by a longitudinal groov

MICROSPORANGIA

each lobe has two microsporangia

microsporangia develops into Pollen Sac

four wall layer

EPIDERMIS

ENDOTHECIUM

MIDDLE LAYER

TAPETUM

NUTRITIVE LAYER

Binucleate and polyploidy

from sporogenous tissue

PMC undergo meosis to form microspore tetrad

PMC is diploid represent sporophyte

microspore dissociate from tetrad after maturation to form pollen

to prevent self fertilisation

DICHOGAMY- non sync of pollen & stigma maturity

HETEROSTYLY- anther and stigma placed at different location

SELF-INCOMPATIBLITY

DIOECISM

PISTIL, MEGASPORANGIUM(OVULE), & EMBRYO SAC

PISTIL

stigma

style

ovary

EMBRYO SAC

Monosporic 7 celeld 8 nucleated is called POLYGONUM
type embryosac

TWO type flower

Cleistogamous

chasmogamous

Pollination in same flower of plant

same plant but different flower

POLLEN from anther to stigma of different flower, cross poll.

AGENT

ABIOTIC

WIND(ANEMOPHILY) AND WATER

BIOTIC

ANIMAL & INSECT

Event from landing of pollen to entering into ovule

pollen tube enter in ovule through micropyle

60% pland shed pollen at 2 celled stage

filliform appratus guide the entry of pollen into embryo sac

characteristic of Angiosperm only

one male gamete fuse with egg= zygote(SYNGAMY)

other male gamete fuse with two polar nuclei=tripple fusion

central cell called PEC

PEC develops into endosperm

provide nutrition to developing embryo

size 25-50 mm

Subtopic

two layer EXINE and INTINE

exine sporopollenin

sporopollenin absent at germ pore

intine continous and exine uncontinous

two cells

VEGITATIVE

big cell

GENERATIVE

spindle shAPE

Float in cytoplasm of vegetative cell

uses

for reproduction

for supplement

cause

allergies and Bronchial problem

VIABLITY

Wheat and Rice for 30 min

Family Solanaqceae, leguminoceae and Rosaceae
for month.