BIOL 1902 Lecture Notes - Lecture 4: Tapetum Lucidum, Species Complex, Calcium Oxalate
27 Oct 2017
School
Department
Course
Professor
Document Summary
More eyes allow for more complete vigilance. Flocking advantageous more eyes more vigilance. Single species flock (benefit from predatory birds) Warblers" would be competing for food but they instead feed at different parts of the tree for insects (avoids competition) differences in within food resources benefits for more eyes to watch for danger. Seeds can be protected inside hard coats (ex: acorns) When trichomes are rubbed, they release a chemical. Water smartweed: no trichomes on leaves in water if water goes away, trichomes appear on leaves (becomes inducible) Structural elements such as cellulose, hemicellulose, and pectin make plant tissues hard to digest (produce cell wall in plants) Lignin gives leaves strength/stiffness (nuts and cherry pits their hardness) Silica is found in horsetails (equisetum) and grasses. Other digestibility reducers are not structural components tannins (drying effect: ex: wines) secondary metabolites. *arum plants have calcium oxalate crystals in their leaves (ex: skunk cabbage) *terpenoids taste bitter (deterrent) and do not contain nitrogen.
