question_answer 32)

  In a fertilized embryo sac, the haploid, diploid and triploid structure are (a) synergid, zygote and primary endosperm nucleus     (b) synergid, antipodal and polar nuclei (c) antipodal, synergid and primary endosperm nucleus                (d) synergid, polar nuclei and zygote

Answer:

                (a) (i) Synergid?haploid (ii) Polar nuclei?haploid (iii) Antipodal?haploid (iv) Zygote?diploid Since, all these cells three cells (synergid, polar nuclei and antipodals are) formed by mitosis from the functional megaspore, they are haploid (n).Egg cell fertilizes with the male gamete to form a diploid zygote. (v) Primary Endosperm Nucleus (PEN). Diploid secondary nucleus fertilizes with a haploid male gamete to form a triploid PEN.