Why This Topic is SUPER Important If you study only one topic from Sexual Reproduction, make it this. 👉 Every year in NEET: Direct questions come from Embryo Sac Students get confused in 7-celled vs 8-nucleate This blog will make it crystal clear in 5 minutes. 🌱 What is Megagametogenesis? Megagametogenesis is the process of formation of female gametophyte (embryo sac) from a functional megaspore. 👉 Simple: Megaspore → Embryo Sac 🔹 How Does Embryo Sac Form? Step 1: Formation of Megaspores Megaspore mother cell → Meiosis → Forms 4 megaspores 👉 3 degenerate 👉 Only 1 functional (chalazal megaspore) remains Step 2: 3 Mitotic Divisions Functional megaspore undergoes: 1st mitosis → 2 nuclei 2nd mitosis → 4 nuclei 3rd mitosis → 8 nuclei 👉 Important: ✔ Only nuclear division (no cell wall yet) ⚡ Key Concept (VERY IMPORTANT) 👉 Free nuclear division first, cytokinesis later Karyokinesis happens Cytokinesis occurs after 8 nuclei stage 🌼 Final Structure of Embryo Sac 👉 Result = 7 cells, 8 ...