Question

Adventive embryony in Citrus is due to

• A. Nucellus
• B. Integuments
• C. Zygotic embryo
• D. Fertilised egg

Answer 1

Answer: (A)

Nucellus

Adventive embryony in Citrus is due to Nucellus. Nucellus is the tissue surrounding the embryo (megasporocyte) within the integuments of an ovule. Most of the times nucellus develop into perisperm (nutrition for the embryo).

But in some plants, these cells, in addition to the actual embryo, can produce embryos that are genetically identical to the parent plant. This mechanism is called adventive embryony. So, the correct answer is option A.