Question

With respect to diagram, answer the following:    

1. Which type of ovule is given in the figure?   (1)
2. Name the first cell of embryo sac.   (1)
3. Identify and write the function of ‘A’ and ‘B’.   (2)

Answer 1

1. The ovule shown in the figure is anatropous.
2. The first cell of the embryo sac is the megaspore.
3. 1. ‘A’ is the micropyle. Its function is to serve as a narrow opening at the apex of the ovule and the passage of the pollen tube. 
   2. ‘B’ is the secondary nucleus. Its function is to form a diploid nucleus due to the fusion of two haploid polar nuclei. It forms the primary endosperm nucleus after fertilization.