Question

When vegetative cell forms embryo without fertilization, it is called as

• A. Apospory
• B. Apogamy
• C. Diploid polyembryony
• D. Adventive polyembryony

Answer 1

Answer: (D)

Adventive polyembryony

Polyembryony is the occurrence of more than one embryo in a seed whereas adventive polyembryony is the formation of embryo directly from the diploid sporophytic cell or vegetative cell. It takes place without the involvement of processes like meiosis and mitosis. For example, in citrus 40 embryos are formed out of which one embryo is formed by fusion while others are adventive.

Apogamy is the development of 1 n sporophytes without gametes and syngamy from vegetative cells of the gametophyte.

Apospory is the development of 2 n gametophytes, without meiosis and spores, from vegetative, or nonreproductive, cells of the sporophyte.

Diploid polyembryony occurs when a diploid embryo is formed by the polyembryony without normal fusion and meiosis.

So, the correct answer is option D.