Plant Kingdom Notes for NEET

Plant Kingdom Notes: Progressive Complexity from Algae to Angiosperms

Plant Kingdom classification follows a progression of increasing structural complexity that NEET tests through comparison and identification questions. Algae are the simplest, lacking true roots, stems, and leaves, and are classified by pigment type: Chlorophyceae (green algae with chlorophyll a and b, e.g., Chlamydomonas, Spirogyra), Phaeophyceae (brown algae with fucoxanthin, e.g., Fucus, Laminaria), and Rhodophyceae (red algae with phycoerythrin, e.g., Polysiphonia, Gelidium used for agar production). Bryophytes are the amphibians of the plant world, requiring water for fertilisation, with the gametophyte as the dominant generation. Liverworts (Marchantia with gemma cups for asexual reproduction) and mosses (Funaria with protonema stage) are key NEET examples. Pteridophytes are the first vascular plants with well-differentiated root, stem, and leaf systems, and the sporophyte is the dominant generation. Selaginella (spike moss) and Equisetum (horsetail) are commonly tested genera.