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STD 12 - 1. sexual reproduction in flowering plants — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 1. sexual reproduction in flowering plants1 Mark
MCQ
PEC (Primary Endosperm Cell) is formed
  • A
    After triple fusionC
  • B
    Before triple fusion
  • C
    At the time of syngamy
  • D
    Always persisted
✓

Answer

a
Primary endosperm cell ( $3 n$ ) formed by fusion of male and polar nuclei.After entering the ovule the pollen tube is attracted toward the micropylar end. The attractant is secreted by filiform apparatus. The pollen tube pierce one of the two synergid and releases its gametes. Out of the two male gametes one fuses with egg to perform generative fertilization (syngamy)It gives rise to the diploid zygote. The nucleus of the second male gametes fuses with the two haploid polar nuclei to form triploid endosperm nucleus. This second fertilization is called vegetative fertilization

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