Chapter 3-Plant Kingdom

NCERT Solutions for Class 11 Biology Chapter 3 – Plant Kingdom

Chapter 3 Plant Kingdom is a comprehensive and detail-rich chapter that takes students on a journey through the entire evolutionary history of the plant world — from the simplest algae to the most complex flowering plants. Understanding the differences between algae, bryophytes, pteridophytes, gymnosperms, and angiosperms is essential not just for CBSE board exams but also for cracking NEET, where at least 2–3 questions from this chapter appear every year. Must check the CBSE resources and NCERT Solutions. 

The level of detail required — life cycles, alternation of generations, seed structure, and distinguishing features of each plant group — can seem daunting, but with the right approach it becomes very manageable. NCERT Solutions for Chapter 3 Plant Kingdom on Myclass24 break down every exercise question with accurate, textbook-aligned answers and helpful explanations. Students from states like Andhra Pradesh, Telangana, Punjab, Haryana, Uttarakhand, Jharkhand, and Chhattisgarh who follow the CBSE curriculum will find these solutions invaluable for scoring well in theory-based as well as conceptual questions.

Download PDF – NCERT Solutions for Class 11 Biology Chapter 3 Plant Kingdom

Plantae (the Plant Kingdom) is classified into several major groups based on the presence or absence of vascular tissue, seeds, and flowers. The earliest plants were aquatic; over millions of years, they evolved to colonise land, developing increasingly complex structures to deal with terrestrial conditions — roots for anchorage, vascular tissue for conduction, and seeds for protected reproduction.

Algae are chlorophyll-bearing, simple, thalloid (no true roots, stems, or leaves), predominantly aquatic plants. They are classified into three major groups based on pigmentation and stored food: Chlorophyceae (green algae — chlorophyll a and b, store starch; e.g., Chlamydomonas, Spirogyra, Ulva), Phaeophyceae (brown algae — fucoxanthin pigment, store laminarin; e.g., Ectocarpus, Fucus, Kelp), and Rhodophyceae (red algae — phycoerythrin pigment, store floridean starch; e.g., Polysiphonia, Gelidium). Algae are the primary producers in aquatic ecosystems and produce about 50% of Earth's oxygen. Check out NCERT Solutions for Class 11 Biology and NCERT Solutions for Class 11 for the rest of the chapters.

Bryophytes are the amphibians of the plant kingdom — they live on land but require water for sexual reproduction (the sperm must swim to the egg). They lack true vascular tissue (xylem and phloem). The plant body is a gametophyte (haploid, dominant generation). The sporophyte (diploid) is partially or completely dependent on the gametophyte. Bryophytes include liverworts (Marchantia), hornworts, and mosses (Funaria, Polytrichum, Sphagnum). Peat moss (Sphagnum) is commercially used as a packing material for live plants and as fuel.

Pteridophytes are the first true vascular plants — they have xylem and phloem but no seeds. The sporophyte is the dominant, independent generation. Examples include ferns (Dryopteris, Pteris), horsetails (Equisetum), and clubmosses (Selaginella, Lycopodium). Selaginella and Salvinia are heterosporous — they produce two types of spores (microspores and megaspores), a feature that foreshadows seed development. Pteridophytes first appeared in the Silurian period and were the dominant land plants during the Carboniferous period (coal-forming era).

Gymnosperms are seed-bearing plants that produce naked seeds — their seeds are not enclosed in a fruit. The word gymnosperm comes from Greek: gymnos (naked) + sperma (seed). They are mostly trees (rarely shrubs) and include the tallest (Sequoiadendron), oldest (Pinus longaeva — Bristlecone pine, ~5000 years old), and most massive (Sequoiadendron giganteum) trees on Earth. Key examples are Cycas, Pinus, Cedrus (deodar), Abies (fir), and Gnetum. They bear strobili or cones and have non-motile male gametes (except Cycas and Ginkgo, which have motile sperms).

Angiosperms are the most successful and diverse group of plants — with over 300,000 known species. The key feature is that their seeds are enclosed within a fruit (angio = vessel, sperm = seed). They have double fertilisation — a unique feature where one sperm fertilises the egg (forming zygote/embryo) and another fuses with the polar nuclei (forming triploid endosperm — the nutritive tissue for the developing embryo). Angiosperms are divided into monocots (one cotyledon — rice, wheat, maize, grass) and dicots (two cotyledons — mango, neem, sunflower, pea). Myclass24 NCERT Solutions for Chapter 3 provide all the detail needed to answer both short and long-form questions accurately.