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Unformatted text preview: Lenticel 3 . Epidermal modifications of note • Hairs or Trichomes: Many types for many purposes • Root hairs: Absorption of H 2 O • Hairs reflect sunlight, lowering temperature and reducing water loss • Some hairs on salt marsh plants secrete salt • Hairs absorb water and minerals on above ground parts of plants • Hairs defend the plant against predators with barbs, traps, etc. • Guard cells Form stomata for gas exchange (Contain chloroplasts) • Glands Modified cells containing oils or other substances for secretion. Many glandular hairs contain toxins and irritants Glandular Trichomes Branched Trichomes Stomata and Guard Cells Root Hairs...
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This note was uploaded on 01/08/2012 for the course BIO 213 taught by Professor Makina during the Fall '09 term at SUNY Stony Brook.
- Fall '09