Question

In embryo sec, n, 2n, 3n conditions are found respectively in

• A. Egg, antipodal and endosperm
• B. Nucleus, endosperm and egg
• C. Antipodal, zygote and endosperm
• D. Endosperm, nucleus and egg

Answer 1

The correct option is C Antipodal, zygote and endosperm

In angiosperms, the functional megaspore is haploid, which undergoes mitotic division and form 7 celled 8 nucleate embryo sac. Therefore, each nucleus of embryo sac is haploid.

At the time of fertilization one male gamete fuses with an egg nucleus to form zygote (2n), whereas the second male gamete fuses with two polar nucleus (central cell) to form endosperm (3n). This type of fertilization is called double fertilization.

Therefore, the correct answer is option C.