Chapter 3 of Class 11 Biology is Plant Kingdom. It covers the classification of plants within Kingdom Plantae, from algae to angiosperms, based on plant body organization, reproduction, and presence/absence of vascular tissue and seeds. These Class 11 Biology Chapter 3 solutions are also useful as quick revision notes before exams.
Algae
Simple, mostly aquatic, chlorophyll-bearing organisms with a thalloid body. Classified into three classes: Chlorophyceae (green algae, chlorophyll a+b), Phaeophyceae (brown algae, fucoxanthin), Rhodophyceae (red algae, r-phycoerythrin).
Bryophytes
The “amphibians of the plant kingdom” — need water for fertilization. Body is thallus-like, gametophyte-dominant, no true vascular tissue. Examples: mosses, liverworts.
Pteridophytes
First plants with true vascular tissue (xylem+phloem) and differentiated body into root, stem, leaves. Sporophyte-dominant; still need water for fertilization. Examples: ferns, Selaginella.
Gymnosperms
Plants with naked seeds (not enclosed in fruit); mostly evergreen, woody. Examples: Pinus, Cycas.
Angiosperms
Flowering plants with seeds enclosed within a fruit; the most advanced and dominant group. Divided into monocotyledons (one cotyledon) and dicotyledons (two cotyledons).
Alternation of Generations
Plant life cycles alternate between a haploid gametophyte generation (produces gametes) and a diploid sporophyte generation (produces spores), with dominance shifting from gametophyte (bryophytes) to sporophyte (pteridophytes, gymnosperms, angiosperms) through plant evolution.
Class 11 Biology Chapter 3 – Notes and Extra Questions
Along with these NCERT Solutions, students can also use the Class 11 Biology Chapter 3 Extra Questions and Class 11 Biology Chapter 3 Revision Notes for quick revision and extra practice.
