Embryo development in a dicot (embryogeny)द्विबीजपत्री में भ्रूण विकास

NCERT Fig 1.13b · Class 12 Biology · Chapter 1 · interactive diagram

Parts and their functions

• Zygote (युग्मनज) — At the micropylar end of the embryo sac. Most zygotes divide only after some endosperm has formed — an adaptation for assured nutrition.
• Proembryo (पूर्वभ्रूण) — First few cells formed from the zygote.
• Globular embryo (गोलाकार भ्रूण) — A ball of cells.
• Heart-shaped embryo (हृदयाकार भ्रूण) — The two cotyledons start growing — heart shape.
• Mature embryo (परिपक्व भ्रूण) — Embryonal axis + two cotyledons (dicot).
• Endosperm (भ्रूणपोष) — Develops before the embryo and feeds it.
• Embryo sac (भ्रूणकोश) — The embryo develops at its micropylar end.

Steps

1. Zygote (2n) at the micropylar end; endosperm forms first.
2. Proembryo.
3. Globular embryo.
4. Heart-shaped embryo.
5. Mature embryo. (Early stages are similar in monocots and dicots.)

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 1.13b. Report a mistake