Easy remember : Process of Fertilization in Flower Plants / Double Fertilisation [BIOLOGY SPM NOTES]

Process of fertilization in flower plants. / Double fertilization. 1. Polle oll en grains grains relea released from f rom anther to t o stigma ti gma by inse insect or w ind. 2. Land on st st igma, epid epidermal ermal cell cell w ill il l sec secrete rete suc sucro ros se soluti ol ution on 3. It sti stimulate mulates s the pollen grain grain to germinate germinate and and form for m pollen pol len tube. 4. Grow down the style to the ovule ovule. 5. Secret ecretes es enzym enzyme e t o diges d igest surr surroun oundi ding ng tis ti ssues as it grow s do dow w nw ards. ards. 6. The gene generativ rative e nucleu nucleus s (follo (fo llow w behind) divided divi ded by mitos mit osis is to form f orm tw t w o male gamete nuclei 7. It mo ves ves dow n to po llen tube tube lea lead by the tube nucle nucleus us.. 8. Reache aches s ovary, penetr penetra ates the ovule ovul e through the microphyll 9. The tube nucleus nucleus degenerated, degenerated, lea l eavi ving ng clear clear pass passag age e t o enter ent er the embr embrio io sac sac for fo r the male nuclei. 10. O ne game gamete te fuses fuses w ith it h the egg egg cell cell t o for f orm m dipl di ploi oid d zygote. zygot e. 11. The othe ot herr fus f use es w ith it h polar pol ar nuclei nuclei to form for m tripl t riploid oid nucleus nucleus w hich hich divide div ide by mitosis to form endosperm tissue. 12. It is calle ll ed double do uble fert fertili iliza zati tion. on.