Plant KingdomNEET Botany · Class 11 · NCERT Chapter 3

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• Bryophytes have no vascular tissue: they are the plant kingdom's amphibians.
• Pteridophytes are the FIRST vascular land plants: they have xylem and phloem.
• Gymnosperms have naked seeds (not enclosed in a fruit). "Gymnosperm" = naked seed.
• Double fertilization is unique to angiosperms and is always asked in NEET.

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• Highlight Bryophytes and Pteridophytes together to see the key difference: pteridophytes have vascular tissue.
• Gymnosperms vs Angiosperms: both have seeds and vascular tissue, but only angiosperms have fruits and flowers.
• The sporophyte becomes increasingly dominant as you move from algae to angiosperms.

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• Fucoxanthin gives Phaeophyceae their brown colour and is responsible for the name "brown algae".
• Gelidium and Gracilaria (red algae) are the source of agar-agar used in microbiology culture media.
• Floridean starch (red algae) is similar to amylopectin and glycogen, NOT to normal starch (amylose).
• Chlorophyceae pigments (chlorophyll a and b) are the same as in land plants, suggesting they share a common ancestor.

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• Bryophytes need water for fertilization because antherozoids are flagellated and must swim.
• Sphagnum (peat moss) is used as fuel and has antiseptic properties. It can hold water like a sponge.
• Riccia is a liverwort (no gemma cups). Marchantia is a liverwort WITH gemma cups.
• The sporophyte in bryophytes is a parasite on the gametophyte, not free-living.

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• Selaginella and Salvinia are the only pteridophytes with heterospory. All others are homosporous.
• Heterospory is the evolutionary precursor of seed habit: megaspore retention on the parent is the key step.
• The large fern plant (Adiantum) is homosporous. The smaller Selaginella is heterosporous.
• In gymnosperms, the "ovule" = megasporangium + integuments. The seed = mature ovule after fertilization.

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• Cycas is DIOECIOUS (separate male and female plants). Pinus is MONOECIOUS (both cones on same plant).
• Coralloid roots of Cycas contain Anabaena and Nostoc (nitrogen-fixing cyanobacteria).
• Pinus has MYCORRHIZAL roots (fungal association), not coralloid roots.
• Gymnosperms produce pollen, so they do NOT need water for fertilization, unlike bryophytes and pteridophytes.

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• Gametophyte is always haploid (n). Sporophyte is always diploid (2n).
• In bryophytes (Funaria, Marchantia), the green plant you see IS the gametophyte (n).
• In pteridophytes (Adiantum fern), the large green fern you see IS the sporophyte (2n).
• Fucus (brown alga) is a NEET trap: it is diplontic, unlike most algae which are haplontic.

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• Trick: "Fucoxanthin" always means Phaeophyceae (brown algae).
• Trick: "Floridean starch" + "phycoerythrin" always means Rhodophyceae (red algae).
• Trick: "Gemma cups" always means Marchantia (a bryophyte).
• Trick: "Double fertilization" is ONLY in angiosperms.