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доля реакций к просмотрам- 24 февр. 2025 г.★ Key notes on the Plant Kingdom from NCERT ★ ════════ ✥.❖.✥ ════════ 1. Introduction to Plant Kingdom Kingdom Plantae includes eukaryotic, multicellular, autotrophic organisms with cell walls made of cellulose. They contain chlorophyll a & b for photosynthesis. Stored food is mainly starch. Life cycle shows alternation of generations (haplodiplontic). ●─────────── 2. Classification of Plant Kingdom (Based on the presence/absence of vascular tissue, seeds, and flowers) A. Thallophyta (Algae) Aquatic, autotrophic, simple thalloid body. No true roots, stem, or leaves (Undifferentiated body). Reproduction: Vegetative (fragmentation), Asexual (spores), Sexual (isogamy, anisogamy, oogamy). Examples: Green Algae (Chlorophyceae) – Chlamydomonas, Volvox, Spirogyra Brown Algae (Phaeophyceae) – Fucus, Laminaria, Sargassum Red Algae (Rhodophyceae) – Polysiphonia, Gelidium, Gracilaria ■□■□■□■□■□■□■□■□ B. Bryophyta (Amphibians of Plant Kingdom) No vascular tissue, true roots, or seeds. Body differentiated into leaf-like, stem-like structures. Require water for fertilization. Dominant phase: Gametophyte (haploid). Reproduction: Sporophyte produces spores; gametophyte forms gametes. Examples: Marchantia, Riccia, Funaria, Sphagnum ●▬▬▬▬๑۩۩๑▬▬▬▬▬● C. Pteridophyta (First Vascular Land Plants) Have vascular tissue (xylem & phloem) but no seeds. Sporophyte dominant; gametophyte (prothallus) is independent. Require water for fertilization. Examples: Selaginella, Equisetum, Pteris, Ferns, Marsilea ﹏﹏﹏﹏﹏✪✭✪﹏﹏﹏﹏﹏ D. Gymnosperms (Naked Seed Plants) Vascular plants with seeds but no flowers. Seeds are "naked" (not enclosed in fruits). Dominant phase: Sporophyte (diploid). Examples: Cycas, Pinus, Ginkgo, Cedrus ≪━─━─━─━─◈─━─━─━─━≫ E. Angiosperms (Flowering Plants) Most advanced and dominant group of plants. Seeds enclosed in fruits; flowers present for reproduction. Double fertilization unique to angiosperms. Two groups: Monocots (e.g., Rice, Wheat, Maize, Banana, Bamboo). Dicots (e.g., Mango, Pea, Rose, Sunflower). ≪━─━─━─━─◈─━─━─━─━≫ 3. Alternation of Generations Plants exhibit Haplodiplontic life cycle: Alternation between haploid gametophyte and diploid sporophyte. Trends in evolution: Algae → Bryophytes → Pteridophytes → Gymnosperms → Angiosperms (increasing dominance of sporophyte). ◇───────◇───────◇ 4. Important Trends in Plant Evolution ════════ ✥.❖.✥ ════════ 5. Economic Importance of Plant Groups Algae: Source of agar, iodine, food (Spirulina – protein-rich). Bryophytes: Peat formation (Sphagnum), soil conservation. Pteridophytes: Ornamental plants (Ferns). Gymnosperms: Timber (Pinus), medicinal uses (Ephedra – ephedrine). Angiosperms: Major food, medicines, wood, fiber sources. ▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃ https://t.me/NEET_JEE_Cuet_Notes_materials ▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃0,25%
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