BIOL10001 Lecture 8: BIOL10001 Lecture 8 Notes
20 Sep 2018
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Triodia: large genus of grasses endemic to australia. Necessary? proteins (enzymes in metabolism) denature (usually 60 degrees +) Water evaporation used as cooling, latent heat loss. Water needed for cellular functioning (turgor, photosynthesis, nutrient transport) Heat gain from warmer air to cooler organism. Heat loss from warmer organism to cooler air. Heat loss from evaporation of water gh - proportional to wind speed (thickness of air boundary layer) gw - proportional to stomatal aperture (where they lose water) Kangaroos: reduce radiation load reduce input stay in shade, promoting latent heat ux, promote sensible heat ux wet areas have lower sensible heat ux therefore lick forearms to stay cool. Leaf orientation lay on cooler soil by digging below hot soil, conduct heat away from body. Vertical v horizontal to minimise surface area exposed to sun at prime time. Sun tracking (diaheliotropic - follow sun, maximise exposure) Sun avoiding (paraheliotropic - move away from sun, minimise exposure)
