BIOA02H3 Lecture Notes - Lecture 12: Ylem, Photosynthesis, Buoyancy

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Huge range of habitats (ex) worldwide to which. 6 limiting factors in which plants need to adapt w/ plants must make adaptations limiting resources. Plants require to adapt to huge range of habitats (occurring all around the world: some habitats are particularly dangerous. Ancestors of angiosperms (cid:0) terrestrial; submerged angiosperms must find ways to adapt to underwater environment. Submerged plants need to make the most adaptations. 5 examples of adaptations: poorly developed xylem, (almost) no mechanical strengthening, maximum surface-to-volume ratio, thin cuticle, not stomates, adapted intercellular air space reduced xylem. Tissues bathed in h2o (cid:0) little need for directed (sophisticated/complex) h2o transport (tissue system) It is enough to have passive cell-cell transport: h2o passing through epidermis. Video: if no snow above the ice + water isn"t frozen (cid:0) plant beneath the rink can photosynthesize during dry winter. Mechanical support would be harmful for the plant: underwater current exerts a great drag (cid:0) would likely to break mechanically-enforced plant.

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