Assertion (A): Only angiosperms undergo double fertilization.

Reason (R): In Asexual reproduction, triple fusion occurs.

The assertion is true, and the reason is the correct explanation.

●      Because the ovary develops into fruit and the ovule develops into a seed with an embryo and primary endosperm inside of it, double fertilisation is regarded as a singular event in the plant kingdom.

●  One male gamete joins the egg cell during double fertilisation to create a diploid zygote.

Only angiosperms have triple fusion

●      The fertilisation of the two polar nuclei in the embryo sac is called triple fusion.

●      It happens when angiosperms undergo double fertilisation.

●      The two polar nuclei present in the core cell of the embryo are fertilised by one sperm cell, while the egg cell in the embryo sac is fertilised by the other sperm cell.

●      One male gamete fuses the female gamete, while the other male gamete fuses the secondary nucleus.

 ●      This method is known as double fertilisation because it involves two male gametes and results in double fertilisation.

●      The process is known as triple fusion because it involves three gametes.

●      Therefore, the assertion is true.

Hence option (a) Both A and R are true, and R is the correct explanation of the assertion is correct.