BIOL 350- Final Exam Guide - Comprehensive Notes for the exam ( 72 pages long!)
28 Mar 2018
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Too little energy to be useful biologically. Snakes have thermal receptors around their noses ( see" ir) Good for: photosynthesis, phototaxis, phototropism, photomorphogenesis, biological rythms, vision. Two types of plants: shade intolerant: sun adapted, shade tolerant: shade adapted, photosynthesis starts slowing after a certain light intensity. Many things can affect light intensity; salinity and depth of water. Carotenoids and chlorophylls absorb mostly blue-violet light and some red. Light available at greater depths in coastal marine systems is not absorbed by chlorophyll or carotenoids. These include: phycocyanin and phycoerythrin, found in cianobacteria and red algae. Depending on what range of light organisms can absorb, they live in different environments. Photoaxis: movement of organisms towards or away from the sun. this helps maximize photosynthesis and may be important for: Phototropism: orientation of plants towards or away from light due to auxins that cause the cell to elongate on one side. Photosynthesis water loss. helps flowers keep warm for pollinators to attract them.
