In angiosperms, double fertilisation results in formation of:
ATwo zygotes developing into twin embryos
BOne diploid (2n) zygote and one triploid (3n) primary endosperm nucleus
CTwo haploid embryos from the two sperm nuclei
DOne diploid zygote only; the second sperm degenerates
Question 2
The zona pellucida of a mammalian egg plays a critical role in:
AProviding nutrients to the developing embryo
BPolyspermy block — prevents more than one sperm from fertilising the egg
CFacilitating sperm chemotaxis toward the egg
DProducing progesterone during early pregnancy
Question 3
During oogenesis, the primary oocyte is arrested in which stage of meiosis until ovulation?
AMetaphase II of meiosis II
BProphase I of meiosis I (diplotene stage — dictyotene)
CMetaphase I of meiosis I
DAnaphase II of meiosis II
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