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Class 12th biology chapter 02 description for study & learn
Class 12 Biology – Chapter 2
NCERT Biology Class 12
This chapter ex
1. Flower – Reproductive Organ of Plants
A flower has four main parts:
Part Function
Sepals (Calyx) Protect flower bud
Petals
Anther → produces pollen grains
Mic
Micropyle
Nucellus
Embryo sac
Megasporogenesis
Formation of megaspores
1 E
Types of Pollination
Type Meaning
Autogamy Same
Water
Biotic Agents
Insects
Birds
Bas
Plants prevent self-pollination by:
Different timing of pollen release
Different position of stigma/anther
Self-incompatibility
Unisees
Pollen tube forms
Tube enters ovule through micropyle
Male gametes released
9. Double Fertilization (Most Important Topic)
Unique feature of flowering plants.
Two events occur:
(A) Syngamy
Male gamete + Egg → Zygote (2n)
(B) Triple Fusion
Male gamete + Polar nuclei → Primary Endosperm Nucleus (3n)
Because two fusions occur, it is called:
Double Fertilization
n
+
n
→
2
n
;
n
+
n
+
n
→
3
n
n+n→2n;n+n+n→3n
10. Post-Fertilization Events
Endosperm
Nutritive tissue for embryo
Usually triploid (3n)
Embryo
Develops from zygote.
Dicot embryo:
Two cotyledons
Monocot embryo:
One cotyledon (Scutellum)
11. Seed Formation
Ovule → Seed
Ovary → Fruit
Types of Seeds
Albuminous (endosperm present)
Non-albuminous (endosperm absent)
12. Fruit Formation
True Fruit
Develops from ovary only.
Example:
Mango
Tomato
False Fruit
Other floral parts also participate.
Example:
Apple
13. Parthenocarpy
Fruit formation without fertilization.
Example:
Banana
Seedless grapes
14. Apomixis
Seed formation without fertilization.
Useful in agriculture because offspring remain identical to parent plants.
Important Diagrams to Practice
Structure of anther
Structure of ovule
Embryo sac
Double fertilization
Dicot embryo
Monocot embryo
Most Important Exam Topics
Pollination types
Double fertilization
Embryo sac structure
Outbreeding devices
Development of embryo
Apomixis vs Parthenocarpy
Quick Revision Points
Pollen grain = Male gametophyte
Embryo sac = Female gametophyte
Angiosperms show double fertilization
Endosperm is usually triploid (3n)
Zygote develops into embryo
Ovary forms fruit
Ovule forms seed
Class 12th biology chapter 02 description for study & learn
Class 12 Biology – Chapter 2
NCERT Biology Class 12
This chapter explains how flowering plants reproduce sexually through flowers, pollination, fertilization, seed formation, and fruit development. It is one of the most important chapters for Board Exams and NEET.
1. Flower – Reproductive Organ of Plants
A flower has four main parts:
Part Function
Sepals (Calyx) Protect flower bud
Petals (Corolla) Attract pollinators
Stamen (Androecium) Male reproductive part
Pistil/Carpel (Gynoecium) Female reproductive part
2. Male Reproductive Part (Stamen)
A stamen has:
Filament → stalk
Anther → produces pollen grains
Microsporangium
Inside the anther, pollen sacs are present.
Microsporogenesis
Formation of pollen grains from pollen mother cells by meiosis.
Important:
Pollen grain = male gametophyte
Outer wall = Exine
Inner wall = Intine
3. Female Reproductive Part (Pistil)
The pistil h
Funicle
Hilum
Micropyle
Nucellus
Embryo sac
Megasporogenesis
Formation of megaspores from megaspore mother cell.
4. Embryo Sac (Female Gametophyte)
Most common type = 8-nucleate, 7-celled embryo sac
Contains:
1 Egg cell
2 Synergids
3 Antipodals
2 Polar nuclei
5. Pollination
Transfer of pollen from anther to stigma.
Types of Pollination
Ty