Bio 1500 exam 4
1. explain how the circular processes of photosynthesis and cellular respiration
result in the cycling of carbon within ecosystems: the two processes use each other's
by-products; CO2 is removed by plants during photosynthesis, turned into organic molecules and then released back
into the atmosphere as CO2 through cellular respiration
2. explain the 2 reasons for imbalance in this cycle that led to the increased O2
during the Carboniferous: 1. photosynthesis arose at the time of the Carboniferous because of extensive
plant growth, causing a lot of O2 in atmosphere
2. carbon was buried due to lack of decomposition on substances such as lignin, which allowed for organic matter to
be buried in the sediments
3. describe the hypothesized reasons for the decline in O2 during the late Per-
mian: during the permian, a volcano erupted that caused mass extinction and a lot of CO2 released in atmosphere
from the heat, which caused O2 to drop because the CO2 was killing the organisms that made O2
4. explain the importance of Lignin and Lignin Decomposition on the rise and
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, fall of O2 levels during the Carboniferous: lignin is what causes carbon burial and low levels of
carbon; lignin decomposition breaks down lignin and allows for carbon levels to rise
5. what are the levels of biological organization?: molecular, cellular, organismal, ecological,
evolutionary
6. what molecular processes reflected our explanation of dragonfly size?: - diffu-
sion
- energy
- ATP
7. what cellular processes reflected our explanation of dragonfly size?: - cellular
respiration
- photosynthesis
- cell structure and function
- genetics
8. what organismal processes reflected our explanation of dragonfly size?: -
cellular processes
- insect respiration
- fermentation
2/6
1. explain how the circular processes of photosynthesis and cellular respiration
result in the cycling of carbon within ecosystems: the two processes use each other's
by-products; CO2 is removed by plants during photosynthesis, turned into organic molecules and then released back
into the atmosphere as CO2 through cellular respiration
2. explain the 2 reasons for imbalance in this cycle that led to the increased O2
during the Carboniferous: 1. photosynthesis arose at the time of the Carboniferous because of extensive
plant growth, causing a lot of O2 in atmosphere
2. carbon was buried due to lack of decomposition on substances such as lignin, which allowed for organic matter to
be buried in the sediments
3. describe the hypothesized reasons for the decline in O2 during the late Per-
mian: during the permian, a volcano erupted that caused mass extinction and a lot of CO2 released in atmosphere
from the heat, which caused O2 to drop because the CO2 was killing the organisms that made O2
4. explain the importance of Lignin and Lignin Decomposition on the rise and
1/6
, fall of O2 levels during the Carboniferous: lignin is what causes carbon burial and low levels of
carbon; lignin decomposition breaks down lignin and allows for carbon levels to rise
5. what are the levels of biological organization?: molecular, cellular, organismal, ecological,
evolutionary
6. what molecular processes reflected our explanation of dragonfly size?: - diffu-
sion
- energy
- ATP
7. what cellular processes reflected our explanation of dragonfly size?: - cellular
respiration
- photosynthesis
- cell structure and function
- genetics
8. what organismal processes reflected our explanation of dragonfly size?: -
cellular processes
- insect respiration
- fermentation
2/6
