Plant Kingdom NEET Notes 2027: Key Points and PDF

Plant Kingdom is Chapter 3 of NCERT Class 11 Biology and part of Unit 1, Diversity in Living World, of the NEET UG syllabus. These notes cover classification systems, the three classes of algae, liverworts and mosses, pteridophytes and heterospory, gymnosperms and a brief note on angiosperms, with comparison tables and a free notes PDF.

Plant Kingdom NEET Notes

Section-wise key points from NCERT Chapter 3, comparison tables, high-yield facts and common mistakes for NEET 2027 revision.

Plant Kingdom at a Glance

The topic list follows the NEET UG 2026 syllabus released by the National Medical Commission (NMC) on 22 December 2025, which stays the reference until the 2027 syllabus is out. The full list is on the NEET syllabus page.

How are plants classified?

Plant classification moved from artificial systems to natural and then phylogenetic systems; fungi and walled members of Monera and Protista are now excluded from Plantae, so cyanobacteria are no longer algae.

• Numerical taxonomy uses computers: every observable character gets a number and code, all characters get equal importance, and hundreds can be considered.
• Cytotaxonomy uses cytological information such as chromosome number, structure and behaviour.
• Chemotaxonomy uses the chemical constituents of the plant.

Algae: Features, Reproduction and Uses

Algae are chlorophyll-bearing, simple, thalloid, autotrophic and largely aquatic organisms.

• Also found on moist stones, soils and wood, with fungi (lichen) and on animals (e.g. sloth bear).
• Forms range from colonial (Volvox) and filamentous (Ulothrix, Spirogyra) to massive marine kelps.
• Vegetative reproduction by fragmentation; asexual by spores, most commonly flagellated zoospores.

• Algae carry out at least half of the total carbon dioxide fixation on earth and are primary producers in aquatic food cycles.
• Porphyra, Laminaria and Sargassum are among the 70 species of marine algae used as food.
• Hydrocolloids: algin from brown algae and carrageen from red algae.
• Agar from Gelidium and Gracilaria is used to grow microbes and in ice-creams and jellies.
• Chlorella, a unicellular alga rich in proteins, is a food supplement even for space travellers.

Three Classes of Algae (NCERT Table 3.1)

• Green algae: chloroplasts may be discoid, plate-like, reticulate, cup-shaped, spiral or ribbon-shaped; pyrenoids contain protein besides starch; wall has an inner cellulose and outer pectose layer.
• Brown algae are mainly marine; kelps may reach 100 metres. Colour (olive green to brown) depends on fucoxanthin. The body has a holdfast, a stalk (stipe) and a leaf-like frond; zoospores and gametes are pear-shaped with two unequal lateral flagella.
• Red algae are mostly marine, more in warmer areas, and occur from the surface to great depths. Floridean starch is similar to amylopectin and glycogen. Spores and gametes are non-motile; sexual reproduction is oogamous with complex post-fertilisation development.

Bryophytes: Liverworts and Mosses

Bryophytes are the amphibians of the plant kingdom: they live in soil but depend on water for sexual reproduction, and the main plant body is a haploid gametophyte.

• Found in damp, humid, shaded places; important in plant succession on bare rocks and soil.
• The thallus-like body is attached by unicellular or multicellular rhizoids; there are no true roots, stems or leaves.
• Sex organs are multicellular: the antheridium produces biflagellate antherozoids; the flask-shaped archegonium produces a single egg.
• The zygote does not undergo meiosis immediately; it forms a multicellular sporophyte that stays attached to the gametophyte and depends on it. Meiosis in the sporophyte gives haploid spores.
• Sphagnum provides peat, used as fuel and as packing material for living material because it holds water.
• Mosses with lichens are the first to colonise rocks; moss mats reduce the impact of rain and prevent soil erosion.

Pteridophytes: First Vascular Land Plants

Pteridophytes (horsetails and ferns) are the first terrestrial plants with vascular tissues, xylem and phloem, and their main plant body is the sporophyte.

• Uses: medicinal, soil-binders and ornamentals. Found in cool, damp, shady places; some grow in sandy soil.
• The sporophyte has true roots, stem and leaves: small microphylls (Selaginella) or large macrophylls (ferns).
• Sporangia are borne on leaf-like sporophylls, which may form compact strobili or cones (Selaginella, Equisetum).
• Spores form by meiosis and grow into a small, free-living, mostly photosynthetic thalloid gametophyte, the prothallus.
• Water is needed for antherozoids to reach the archegonium, which, with the prothallus’ need for cool damp shade, limits their spread.
• Most pteridophytes are homosporous. Selaginella and Salvinia are heterosporous: megaspores form female and microspores form male gametophytes.
• In heterosporous forms the female gametophyte stays on the parent sporophyte and the embryo develops inside it, a precursor to the seed habit.

Gymnosperms: Naked Seeds

In gymnosperms the ovules are not enclosed by an ovary wall, so the seeds formed after fertilisation remain exposed (naked).

• Medium or tall trees and shrubs; the giant redwood Sequoia is one of the tallest tree species.
• Roots are generally tap roots. Pinus has mycorrhiza; Cycas has coralloid roots with nitrogen-fixing cyanobacteria.
• Stems are unbranched (Cycas) or branched (Pinus, Cedrus). Cycas has pinnate leaves that persist for a few years.
• Conifer needle-like leaves reduce surface area; a thick cuticle and sunken stomata cut water loss.
• Gymnosperms are heterosporous. Microsporophylls form male strobili; the pollen grain is the highly reduced male gametophyte.
• Megasporophylls with ovules form female strobili. Pinus bears male and female cones on the same tree; in Cycas, male cones and megasporophylls are on different trees.
• The megaspore mother cell arises from the nucellus; the nucellus with its envelopes is the ovule. One of four megaspores forms a multicellular female gametophyte with two or more archegonia.
• Neither gametophyte is free-living. Pollen travels by air to the ovule; the pollen tube carries male gametes to the archegonia. The zygote forms the embryo and the ovule becomes an uncovered seed.

Angiosperms in Brief

• Pollen grains and ovules develop in flowers, and seeds are enclosed in fruits.
• Size ranges from the smallest, Wolffia, to Eucalyptus trees over 100 metres tall.
• Two classes: dicotyledons and monocotyledons.

Bryophytes vs Pteridophytes vs Gymnosperms

This comparison is built only from the NCERT text and covers the groups the NEET syllabus lists.

Most-asked Facts for NEET: Plant Kingdom

Revise these one-line facts from the NCERT chapter just before the exam.

• Cyanobacteria are no longer counted as algae.
• Bentham and Hooker gave a natural classification of flowering plants.
• Algae carry out at least half of the earth’s total CO2 fixation.
• Spirogyra: isogamous, non-flagellated gametes; Eudorina: anisogamous; Volvox and Fucus: oogamous.
• Pyrenoids contain protein besides starch.
• Brown algae: fucoxanthin, laminarin or mannitol, algin; body with holdfast, stipe and frond.
• Red algae: r-phycoerythrin, floridean starch, no flagella.
• Agar comes from Gelidium and Gracilaria; carrageen from red algae; algin from brown algae.
• Chlorella is a protein-rich food supplement used even by space travellers.
• Bryophytes are the amphibians of the plant kingdom.
• Gemmae develop in gemma cups in Marchantia.
• Moss gametophyte stages: protonema and leafy stage.
• Sphagnum provides peat.
• Pteridophytes are the first terrestrial plants with xylem and phloem; gametophyte is the prothallus.
• Selaginella and Salvinia are heterosporous.
• Equisetum: Sphenopsida; Psilotum: Psilopsida; Dryopteris, Pteris, Adiantum: Pteropsida.
• Cycas has coralloid roots with N2-fixing cyanobacteria; Pinus has mycorrhiza.
• Wolffia is the smallest angiosperm; Eucalyptus trees exceed 100 metres.

Common Mistakes to Avoid

Watch for these mix-ups when you answer questions on this chapter.

• Calling cyanobacteria (blue-green algae) members of Plantae. They are excluded from the plant kingdom.
• Giving red algae flagella. Red algae have none; green algae have 2 to 8 equal apical and brown algae 2 unequal lateral flagella.
• Calling Spirogyra anisogamous. It is isogamous with non-flagellated gametes; Eudorina is anisogamous.
• Saying the bryophyte sporophyte is free-living. It is attached to and depends on the gametophyte.
• Swapping dominant phases: the gametophyte dominates in bryophytes, the sporophyte in pteridophytes.
• Assuming all pteridophytes are heterosporous. Most are homosporous; Selaginella and Salvinia are heterosporous.
• Mixing up roots: Cycas has coralloid roots with cyanobacteria, Pinus has mycorrhiza.
• Saying Cycas bears male and female cones on the same tree. That is Pinus; in Cycas they are on different trees.
• Calling Sphagnum a liverwort. It is a moss; Marchantia is the liverwort.
• Linking algin to red algae. Algin comes from brown algae; carrageen and agar come from red algae.

Plant Kingdom Notes PDF and Related Pages

Download the AglaSem notes for Plant Kingdom (key notes and important questions with answers) free: View PDF

• All chapters: NEET Biology notes
• Full topic list: NEET syllabus
• Practice: NEET question papers
• Source text: NCERT Chapter 3 (NCERT, Class 11 Biology)

NEET Biology Notes: All Chapters

Botany

• The Living World
• Biological Classification
• Plant Kingdom
• Cell: The Unit of Life
• Plant Growth and Development
• Anatomy of Flowering Plants
• Cell Cycle and Cell Division
• Respiration in Plants
• Photosynthesis in Higher Plants
• Morphology of Flowering Plants
• Principles of Inheritance and Variation
• Microbes in Human Welfare
• Sexual Reproduction in Flowering Plants
• Molecular Basis of Inheritance
• Organisms and Populations
• Ecosystem
• Biodiversity and Conservation

Zoology

• Animal Kingdom
• Biomolecules
• Breathing and Exchange of Gases
• Excretory Products and their Elimination
• Body Fluids and Circulation
• Structural Organisation in Animals
• Locomotion and Movement
• Reproductive Health
• Chemical Coordination and Integration
• Neural Control and Coordination
• Evolution
• Human Health and Disease
• Human Reproduction
• Biotechnology and its Applications
• Biotechnology: Principles and Processes

All chapters with their notes PDFs are on the NEET Biology notes page.

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