This is the final part of the chapter—and very important for:
Concept-based questions
Diagram-based questions
Dicot vs Monocot comparisons
๐ Easy marks if revised properly
๐ผ What Happens After Fertilization?
After double fertilization:
๐ Zygote (2n) → Embryo
๐ Primary Endosperm Nucleus (3n) → Endosperm
๐ฟ 1. Endosperm Development
Endosperm provides nutrition to developing embryo.
๐ Important: Endosperm develops before embryo
๐ธ Types of Endosperm
๐ 1. Free Nuclear Type
Only nuclear division
No cell wall initially
Endosperm is liquid
๐ Example: Coconut water
๐งฑ 2. Cellular Type
Nuclear division + cell wall formation
Endosperm becomes solid
๐ Example: Coconut (white part)
๐ 3. Helobial Type
Intermediate type
One part → free nuclear
Other → cellular
๐ง Quick Trick
๐ Free nuclear = liquid
๐ Cellular = solid
๐ฑ 2. Embryogeny in Dicot
๐ธ Initial Division
Zygote divides into:
Terminal cell
Basal cell
๐ธ Suspensor Formation
Basal cell → Suspensor
๐ Function:
Pushes embryo into endosperm
Helps in nutrition
๐ธ Embryo Development Stages
2-celled stage
4-celled (Quadrant)
8-celled (Octant)
๐ฟ Mature Dicot Embro
2 Cotyledons
Plumule (shoot)
Radicle (root)
Hypocotyl & Epicotyl
๐พ 3. Embryogeny in Monocot
๐ธ Special Features
Only 1 cotyledon → Scutellum
๐ฟ Structure
Scutellum → Cotyledon
Coleoptile → protects plumule
Coleorhiza → protects radicle
Epiblast → small structure
๐ธ Endosperm Region
Large endosperm present
Outer layer → Aleurone layer
⚡ Dicot vs Monocot (Very Important)
Feature. Dicot. Monocot
Cotyledons. 2. 1 (Scutellum)
Endosperm. Often absent. Present
Protection. No, Coleoptile & Coleorhiza
๐น Final Transformations
Structure. Becomes
Ovule. SeedOvary. FruitZygote. EmbryoEndosperm. Food
๐ฏ NEET Important Points
✔ Endosperm is triploid (3n)
✔ Develops before embryo
✔ Suspensor pushes embryo
✔ Dicot = 2 cotyledons
✔ Monocot = scutellum
๐ง Super Revision Lines
๐ PEN → Endosperm
๐ Zygote → Embryo
๐ Ovule → Seed
๐ Ovary → Fruit
❌ Common Mistakes
Forgetting 3n endosperm
Confusing scutellum with cotyledon
Ignoring suspensor role
๐ Final Takeaway
๐ One fertilization gives embryo
๐ Second ensures nutrition (endosperm)
๐ Together → complete seed formation
Thank you so much.
Regards,
Himansu
