1) Where does the oxygen in the atmosphere come from, specifically? A. the calvi
ID: 177514 • Letter: 1
Question
1) Where does the oxygen in the atmosphere come from, specifically?
A. the calvin cycle in C3 plants
B. the light reactions, from the splitting of water molecules
C. from metabolic water
D. it is pumped up by the roots, from the air spaces in the soil
E. From the oxygen in the CO2 molecules, synthesized during carbon fixation
2) Adiabatic changes in the temperature of rising and falling air:
A. are caused largely by the coriolis effect as winds veer to the right or the left depending on the hemisphere and the direction they are traveling along Earths surface
B. are one of the major underlying factors contributing to rain on the windward side of coastal mountains and dry rain shadows inland
C. result in patterns of cool, moist air falling over the earths surface at around 30 degrees N and S of the equator
D. affect climate but do not affect animals and plants very much because these effects largely occur when organisms are dormant or at night
E. All of the above are true
3. CHAM photosynthesis
A. uses the same enzyme as C4 plants for the initial capture of CO2 from the atmosphere, but a different enzyme than C3 plants use
B. occurs primarily in plants in arctic and alpine environments
C. occurs when plants take up light in the dark
D. Is advantageous to desert plants because it enables them to photosynthesize very rapidly and grow quickly during the short rainy season in desert environments
E. all of the above
Explanation / Answer
Answer:
1). B. the light reactions, from the splitting of water molecules
Oxygen comes from the photosynthesis of plants. Especiallu, during light reaction, H2O is splitted thereby oxygen released into the atmosphere.
2). E. All of the above are true
3). E. all of the above
CAM plants are more common than C4 plants and include cacti and a wide variety of other succulent plants. There are two distinctly different ecological environments where CAM plants may be found. Most are terrestrial plants typical of deserts or other harsh, dry sites. However, instead of fixing carbon during the day and pumping the OAA to other cells, CAM plants fix carbon at night and store the OAA in large vacuoles within the cell.
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