Multiple choice

Double fertilization refers to fusion of

  1. two polar nuclei

  2. secondary nucleus with male gamete

  3. two eggs

  4. one male gamete with an egg and another with 2 polar nuclei

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 Double fertilisation refers to the fusion of one male gamete with an egg and another with 2 polar nuclei.The two central cell maternal nuclei (polar nuclei) that contribute to the endosperm arise by mitosis from the same single meiotic product that gave rise to the egg. The maternal contribution to the genetic constitution of the triploid endosperm is double that of the embryo.