Question

Development of an embryo sac from a nucellar cell is

• A. Diplospory
• B. Apospory
• C. Apogamy
• D. Adventitive embryony

Answer 1

The correct option is B Apospory

• Diplospory- It is a type of agamospermy in which unreduced megaspore mother cell undergoes mitosis instead of meiosis and produces an embryo sac.

• Apospory- It is a type of agamospermy in which nucellar cells of ovule divide mitotically to form an unreduced embryo sac which is diploid.

• Apogamy- It is the formation of a sporophyte from the gametophyte without the fusion of gametes.

• Adventive embryony- It is a type of apomixis in which there is a formation of embryo due to sporophytic budding. One or more diploid sporophytic cells, either nucellus or integuments undergo stages of embryogeny and eventually develop into mature embryos.

So, the correct answer is B.