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Sexual Reproduction in Flowering Plants — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYSexual Reproduction in Flowering Plants3 Marks
Question
Differentiate between egg cells and secondary nucleus found in embryo sac of angiosperms.
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Answer

Differences between Egg cell and Secondary nucleus :
S.No.Egg CellSecondary Nucleus
1It is situated closely to micropyle inembryo sac.It is situated almost in the middle of embryo sac.
2Egg cell is surrounded by synergids on either side.It is not surrounded by any structure.
3It has only one nucleus which has haploid no. of chromosomes.It has two haploid nuclei which fuse together forming diploid secondary nucleus.
4It fuses with male gamete to produce zygote (2n).It fuses with male gamete to produce primary endosperm nucleus (3n).
 

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