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12th Biology 2017 Set1 Delhi Board Paper Solution

Question 24

Prepare a flow chart to depict the post-pollination events leading to viable seed production in a flowering plant.



                                                                        Pollen grain germinates on stigma


                                                        Pollen tube carrying the male gamates reaches the ovule     


                                                              It discharges the male gamates near the eggs


                                                   Syngamy/Fusion of male gamate with egg occurs to form zygote


                            Triple fusion/fusion of male gamate with two polar nuclei to form PEN (Primary Endosperm Nucleus)


                                                                           Ovule develops into seed