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Question

Double fertilization occurs in
  1. Riccia
  2. Pteridium
  3. Cycas
  4. Eucalyptus


Solution

The correct option is D Eucalyptus
Double fertilization is a characteristic feature of angiosperms, e.g., Eucalyptus. It includes two fusions by two male gametes. One male gamete fuses with the egg cell. This results in the formation of a diploid cell, the zygote. The other male gamete moves towards the two polar nuclei and fuses with them to produce a triploid primary endosperm nucleus (PEN). As this involves the fusion of three haploid nuclei it is called triple fusion. Since there are two types of fusions, syngamy and triple fusion, that take place in the embryo sac, the phenomenon is termed double fertillisation.

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