NSCI 1413 Lecture Notes - Lecture 15: Root Pressure, Endoderm, Circadian Rhythm
6 May 2017
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Bryophytes: primitive plants that lack vessels; must absorb water through diffusion from air; lack lignin fortified tissue; Seedless plants: reproduce by spores (ex: ferns) Seed plants: reproduce by seeds; produce both megaspores (future gametophyte) and microspores (future . Angiosperms/anthophyta: flowering plants (ex: roses, daisies, apples, lemons) Monocotyledon: monocots (ex: grasses, corn, wheat, rye, oats) Usually in 3s usually in 4s or 5s. Strategies that enabled plant to move to land. Moved to land as competition for resources ; biggest challenges are supporting the plant body and conserving water by a watery environment. Cell walls made of cellulose lend support to plants whose cells must maintain their own shape, since unsupported. Roots and root hairs absorb water and nutrients from soil. Stomates open to exchange photosynthetic gases and close to minimize excessive water loss. Cutin , the waxy coating on the leaves, helps prevent excess water loss from the leaves.
