Question

Siphonogamy in angiosperms means-
A)Tube like male gametes
B)Motile male gametes
C)Male gametes produced in a tube
D)Male gametes carried in a tube

Answer 1

Siphonogamy is a condition in which the pollen tubes are developed so as to facilitate the process of reproduction. It occurs in the higher plants whereas in case of lower plants, the gametes swim for facilitating fertilisation. It is the process which occurs in sexual reproduction.

Complete answer:
The angiosperms are the higher seed producing plants. These plants flower in the stages of their lifecycle. The angiosperms have small pollen grains which help in transferring the genetic information from one flower to another. The pollen grains are the powdery substance carried by the male gametes. The male gametes are the haploid male genetic material. The female reproductive parts are smaller as compared to the non-flowering plants. This helps in producing seeds rapidly.

The angiosperms are called siphonogamous. In this the pollen tubes are developed to carry the male gametes to the egg. The spermatocytes are referred to as siphonogama.

The plants reproduce asexually which does not involve the male and female gametes. The plants produce genetically identical offspring through asexual reproduction.

Hence, the correct answer is option (D)

Note: The fertilisation in angiosperms is called double fertilisation. It involves the fusion of male and female gamete followed by the fusion of sperm with the polar nuclei. One sperm fuses with the egg to form an embryo. The second sperm fuses with the central cell and forms an endosperm.