Question

Which of the following processes occurs only in angiosperms?

• A. Fusion of male and female gametes inside the plant body.
  
• B. Presence of male and female sexual organs on different plants.
  
• C. Formation of secondary nucleus by fusion of two polar nuclei.
  
• D. Development of zygote inside the plant body.

Answer 1

The correct option is C

Formation of secondary nucleus by fusion of two polar nuclei.

Formation of secondary nuclues by fusion of two polar nuclei is a characteristic feature of angiosperms. Double fertilization is a characteristic of angiosperms. One fertilization involves fusion of sperm and egg to produce a diploid zygote. Two polar nuclei then fuse to become a secondary nucleus. Second fertilization involves fusion of sperm with secondary nucleus to produce a triploid endosperm.