BIO120H1 Chapter Notes - Chapter 6: Fuzhou Dialect, Carboxylation, Vascular Bundle
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BIO120H1 Full Course Notes
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6. 0 adaptations to the physical environment: light, energy, and heat. The ability to counteract external physical forces distinguishes the living from the nonliving. Ultimate source of energy the sun loss. 6. 1 plants modify photosynthesis in environments with high water stress. Catalyzed by pep carboxylase (has high affinity for. Allows co2 to reach much higher concentrations within the bundle sheath cells than it could by diffusion from the atmosphere. Enzyme pep carboxylase has a high affinity for co2, it can bind co2 at a lower concentration in the cell, thereby allowing the stomates to remain closed longer and reduce water loss. Carbon assimilation in cam plants: water-stressed environment plants use c4 system, but segregate co2 assimilation and the calvin benson cycle between night and day, crassulacean acid metabolism (cam). Plants have spines and hairs to help adapt to heat and drought: also helps trap moisture + reduce evaporation. 6. 2 diffusion limits uptake of dissolved gases from water.
