Indicate the stages where meiosis and mitosis occur (1, 2 or 3) in the flow chart.

Megaspore mother cell →Megaspores → Embryo sac →Egg

Megaspores – Meiosis, Embryo sac – Mitosis, Egg - Mitosis

Explanation: Megaspores are produced from megaspore mother cell through the process of Megasporogenesis by meiosis division.

One of the functional megaspore gets developed into embryo sac by the process called Monosporic development by mitotic division.

Embryo sac at maturity is 8-nucleate and 7-celled. And also the cells in the embryo sac are distributed such that the three cells are grouped together at the micropylar end and constitute the egg apparatus. And the three cells are at the chalazal end and are called the antipodals. So the egg apparatus is situated micropylar end. So conversion of embryo sac to egg is a mitotic division.