Question
Biology Question on sexual reproduction in flowering plants
Which one of the following is the unique feature of angiosperms?
A
Haploid endosperm
B
Circinate vemation
C
Coralloid roots
D
Double fertilization
Answer
Double fertilization
Explanation
Solution
In angiosperms, double fertilization which is a unique angiosperm feature (first discovered by Nawaschin in 1898 in Fritillaria and Lilium) occurs when one male gamete fuses with the egg cell to produce diploid zygote while the other male gamete fuses with diploid secondary nucleus (formed by fusion of two polar nuclei) to produce primary endosperm nuclei which produces endosperm. As endosperm results by fusion of a diploid nucleus and a haploid gamete hence it is a triploid structure.