Plant Kingdom
NCERT Biology | Class 11 CBSE | NEET-UG Preparation
Chapter overview:
Learn the classification of the plant kingdom, major characteristics of algae, bryophytes, pteridophytes, gymnosperms and angiosperms, plant life cycles, and alternation of generations. This summary highlights important concepts for CBSE examinations and NEET-UG revision.
Classification of the Plant Kingdom
The plant kingdom contains organisms that differ in their body structure, reproductive methods, vascular tissues and seeds. Studying these differences helps us understand the evolution of plants from simpler forms to more complex groups.
Major groups of plants
- Algae: Simple, predominantly aquatic, photosynthetic organisms with a relatively undifferentiated plant body.
- Bryophytes: Small plants that lack true vascular tissues and do not produce seeds.
- Pteridophytes: Vascular plants that do not produce seeds; they reproduce through spores.
- Gymnosperms: Seed-producing plants whose ovules and seeds are not enclosed within an ovary and fruit.
- Angiosperms: Flowering plants whose seeds develop inside fruits.
Important criteria used in classification
- Whether the plant body is differentiated into root, stem and leaves.
- Presence or absence of vascular tissues: xylem and phloem.
- Presence or absence of seeds.
- Whether seeds are naked or enclosed within fruits.
- Dominant phase of the life cycle: gametophyte or sporophyte.
- Dependence on water for fertilisation and reproductive adaptations.
| Group | Vascular tissue | Seeds | Major reproductive feature |
|---|---|---|---|
| Algae | Absent | Absent | Reproduction varies; commonly includes spores and gametes |
| Bryophytes | Absent | Absent | Spores; gametophyte is dominant |
| Pteridophytes | Present | Absent | Spores; sporophyte is dominant |
| Gymnosperms | Present | Present | Naked seeds; cones in typical examples |
| Angiosperms | Present | Present | Flowers; seeds enclosed in fruits |
CBSE and NEET focus: Remember the distinction between non-vascular and vascular plants, spore-producing and seed-producing plants, and naked and enclosed seeds.