Question

Primary Endosperm Nucleus is the product of:

• A. Double fusion
• B. Triple fusion
• C. Parthenogenesis
• D. Apomixis

Answer 1

The Correct Option is B

Term	Description
Double fusion	A fusion process involving two gametes, typically resulting in the formation of a zygote.
Triple fusion	A unique fertilization event in angiosperms where one sperm nucleus fuses with two polar nuclei to form the primary endosperm nucleus.
Parthenogenesis	A form of asexual reproduction where an egg develops into an organism without fertilization.
Apomixis	Reproductive process where seeds are produced without fertilization, involving a fusion.

The primary endosperm nucleus formation involves a process specific to flowering plants known as double fertilization. During this event, one sperm cell fertilizes the egg forming a diploid zygote, while another sperm cell fuses with two polar nuclei in the central cell of the ovule forming a triploid cell, known as the primary endosperm nucleus. This process is called triple fusion. 

In conclusion, the primary endosperm nucleus is the result of triple fusion, which is part of the double fertilization process in angiosperms.

Answer 2

(1) Double fusion

Double fusion is not the correct term for the formation of the primary endosperm nucleus. Double fertilization is the process in angiosperms where two sperm nuclei from the pollen grain fertilize two different cells in the embryo sac, but this term does not specifically describe the formation of the primary endosperm nucleus.

(2) Triple fusion

This is the correct answer. Triple fusion refers to the process where one sperm nucleus fuses with the two polar nuclei in the central cell of the embryo sac, resulting in the formation of the primary endosperm nucleus, which is typically triploid.

(3) Parthenogenesis

Parthenogenesis is a form of asexual reproduction where an embryo develops from an unfertilized egg. It is not related to the formation of the primary endosperm nucleus.

(4) Apomixis

Apomixis is a type of asexual reproduction that produces seeds without fertilization. It does not involve the formation of the primary endosperm nucleus.

Conclusion

The correct answer is (2) Triple fusion, as this process specifically describes the formation of the primary endosperm nucleus in angiosperms.