Bio 20 Final Exam |188 Questions and Answers with complete solution

What are the components of the biosphere? - Atmosphere (air), Lithosphere (land), Hydrosphere (water) Describe the atmosphere composition - Most of the atmosphere is made up of Nitrogen - 78.084% and Oxygen - 20.95%. Water makes up between 1%-4%. Describe the flow of Solar Energy through Photosynthesis - 6CO2 + 6H2O + light energy ---> 602 + C6H12O6. Describe the flow of Solar Energy through Cellular Respiration - C6H12O6 + 6O2 ----> 6C02 + 6H20 + heat energy Explain the Water Cycle: Evaporation - The water moves up from a body of water to the sky. Explain the Water Cycle: Condensation - The water gets stored in the clouds. Explain the Water Cycle: Precipitation - When the clouds release moisture through rain or snow etc. Explain the Water Cycle: Transpiration - When trees sweat. Explain the Water Cycle: Percolation - It is similar to a water filter in a pond. When the water is taken under and then is pushed out the top again similar to a fountain. Explain the factors influencing the rate of transpiration - (1)Light:-During day time stomata remain open and so evaporation of water takes place normally; but at night these stomata are not open with the result transpiration is checked(2)Humidity of the Air:-When atmosphere is dry, then transpiration is more, because it receives water readily but when atmosphere becomes moist or saturated, then it can receive no more of water. (3)Temperature of Air:- The rate of transpiration enhances when the temperature surface is not allowed to become saturated. Describe the Carbon Cycle - - Sunlight activates Photosynthesis - Organic Carbon is released from the plant - Fossils and Fossil Fuels go into the ground - The Roots Respire - Factory Emissions are released - The animals are eating the plants and then respire - Carbon Dioxide is now in the air from both the factor emissions and the animals, and the cycle repeats. Define Combustion - a process in which a substance reacts with oxygen to give heat and light Define Decomposition - decaying caused by bacterial or fungal action