# Plant Kingdom Notes, Class 11 Biology | SwaVid Plant Kingdom, NCERT Class 11 Biology: notes with key ideas, key terms, common mistakes and 3 quick checks with worked answers. Canonical: https://www.swavid.com/cbse/class-11/biology/chapter/plant-kingdom Source: https://www.swavid.com/cbse/class-11/biology/chapter/plant-kingdom # Plant Kingdom ## Key terms ## Key ideas ## Common mistakes ## Quick checks ## Keep going ## Questions parents ask ## Class 11 Biology on SwaVid ### Systems of plant classification ### Algae ### Bryophytes ### Pteridophytes ### Gymnosperms ### Next chapter ### Related chapter ### Related chapter ### All chapters SwaVid › CBSE › Class 11 › Biology › Plant Kingdom Notes written by SwaVid from the NCERT textbook. Class 11 Biology, Chapter 3. Key ideas, formulas and common mistakes. CBSE prints 15 marks for Unit I, not for this chapter alone. Short answer. This chapter describes the classification and distinct characteristics of the plant kingdom, covering algae, bryophytes, pteridophytes, and gymnosperms. Students learn how plants transitioned from simple thalloid aquatic forms to complex seed-bearing terrestrial organisms. Source: NCERT Biology (Reprint 2026-27) , Chapter 3, Plant Kingdom Artificial systems used superficial morphological characters like habit and androecium structure. Natural systems considered external and internal features such as anatomy, embryology, and phytochemistry, while phylogenetic systems classify organisms based on evolutionary relationships. Algae are chlorophyll-bearing, simple, thalloid, autotrophic, and largely aquatic organisms. They are divided into Chlorophyceae (green algae), Phaeophyceae (brown algae), and Rhodophyceae (red algae) based on their major photosynthetic pigments, cell wall composition, and stored food. Bryophytes include liverworts and mosses that grow in moist shaded areas and are called amphibians of the plant kingdom. Their main plant body is a haploid gametophyte, which bears multicellular sex organs producing antherozoids and an egg to form an attached sporophyte. Pteridophytes are the first terrestrial plants possessing vascular tissues, xylem and phloem, and include horsetails and ferns. The main plant body is a diploid sporophyte differentiated into true roots, stem, and leaves, which produces spores inside sporangia. Gymnosperms are plants with naked ovules not enclosed by an ovary wall before or after fertilisation. They are heterosporous and bear microspores and megaspores on lax or compact strobili or cones. Try each question first. Then tap it to see the answer. Phaeophyceae members possess chlorophyll a, chlorophyll c, carotenoids, and xanthophylls (predominantly fucoxanthin). Food is stored as complex carbohydrates, specifically laminarin or mannitol. Pigments: chlorophyll a, c, and fucoxanthin; Stored food: laminarin and mannitol Bryophytes live in soil on land. They depend on water for sexual reproduction because flagellated antherozoids must swim to the archegonium. They live on land but require water for sexual reproduction. Heterosporous pteridophytes produce two different kinds of spores. These are the large megaspores and the small microspores. Megaspores and microspores Animal Kingdom . Biological Classification . Morphology of Flowering Plants . The 19 chapters of Class 11 Biology . CBSE does not give marks to one chapter. It prints 15 marks for Unit I, Diversity of Living Organisms, which includes Plant Kingdom. No. They are written by SwaVid from the NCERT textbook. The CBSE curriculum is the reference for what is assessed. Animal Kingdom. SwaVid is an AI tutor for Indian students in Classes 6 to 12. It finds the earlier ideas a child missed, then teaches today’s chapter. Start free to see how it works. - Ch 3 NCERT book - 15 marks, Unit I - 3 quick checks - Confusing the dominant phase of bryophytes with that of pteridophytes . Remember that the dominant, independent phase is the haploid gametophyte in bryophytes, but the diploid sporophyte in pteridophytes. - Classifying Gymnosperms as having fruits because they produce seeds . Gymnosperms bear exposed or naked ovules because they lack an ovary wall. Fruits develop only from an ovary, so gymnosperms never produce fruits. - Assuming all algae show flagellated motile stages . Red algae (Rhodophyceae) completely lack flagellated stages and reproduce by non-motile spores and non-motile gametes. ## Key Links - [CBSE](https://www.swavid.com/cbse) - [Class 11](https://www.swavid.com/cbse/class-11) - [Biology](https://www.swavid.com/cbse/class-11/biology/chapters) - [Start free →](https://www.swavid.com/signup) - [All 19 chapters](https://www.swavid.com/cbse/class-11/biology/chapters) - [NCERT Biology (Reprint 2026-27)](https://ncert.nic.in/textbook.php) - [Open notes](https://www.swavid.com/cbse/class-11/biology/chapter/animal-kingdom) - [Open notes](https://www.swavid.com/cbse/class-11/biology/chapter/biological-classification) - [Open notes](https://www.swavid.com/cbse/class-11/biology/chapter/morphology-of-flowering-plants) - [Class 11 Biology](https://www.swavid.com/cbse/class-11/biology/chapters) - [Start free →](https://www.swavid.com/signup)