BIO SCI 94 Chapter Notes - Chapter 56: Primary Production, Chemical Energy, Cellular Respiration

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 94
• Professor: Robin Bush

Document Summary

Ecosystem: species present in a region, along with abiotic components. Biosphere: thin zone of life surrounding the earth. Gross primary productivity (gpp): total amount of chemical energy produced in a given area and time period. Cellular respiration: takes energy just to stay alive. Net primary productivity (npp): energy that is invested by primary producers in building new tissue of offspring. Represents total amount of chemical potential energy that is stored in biomass; critically important because it is the amount of energy available via primary producers to the other organisms of an ecosystem. R = energy used in cellular respiration or lost. No, plants only use 0. 8 percent of sunlight. Pigment that drive photosynthesis can absorb only fraction of light wavelengths available. Plants in temperate biomes have drastically reduced photosynthetic rates in winter. Stomata close to conserve water when conditions get dry -- photosynthesis stalls due to lack of co2.