ICSE Class 9 Answered
(i) Draw a neat and well-labelled diagram of a developing pollen grain.(ii) What is double fertilization?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer
(i)
(ii) One male gamete or sperm nucleus approaches the egg cell, enters and fuses with the egg cell nucleus to form a diploid zygote. This is known as first fertilization.
The second male gamete moves towards the centre, fuses with a secondary nucleus or with two polar nuclei within the embryo sac to form endosperm or endosperm nucleus. This is called secondary fertilisation.
As fertilization occurs twice, the process is called double fertilization.
Answered by | 04 Jun, 2014, 03:23: PM
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