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BIO1500 Test 4 BUSH Exam Questions And
Answers |Latest 2025 | Guaranteed Pass
Explain how circular processes of photosynthesis & cellular respiration result in the cycling of
carbon within ecosystems - Answer✔Increase in PS relative to CR will increase O2. All carbon in
organic molecules comes from products of PS, the carbon gets put back into the air by being
consumed by animals/decomposers & release CO2 (Cr produces water & CO2 which PS uses to
make O2 & glucose which CR uses)
Explain the 2 reason for an imbalance in this cycle that led to the increased O2 during the
Carboniferous - Answer✔Land was full of plants, so lots of PS but lots of carbon was buried
instead of undergoing CR because these tress used lignin instead of cellulose which resulted in
no decomposers breaking it down; those carbon became fossil fuels
Describe the hypothesized reasons for the decline in O2 during the late Permian - Answer✔It
was a drier climate so there was a reduction in PS. Decomposition facilitated by sandy
sediments, fungi evolved to be able to break down lignin; more carbo enters CR so O2 levels
dropped
Explain the importance of lignin & lignin decomposition on the rise & fall of O2 levels during the
Carboniferous - Answer✔when lignin is present you have more O2 released into the
atmosphere & coal formation & bigger plants; lignin decomposition removes excess O2 from
the atmosphere & go back into organic carbons w/ no coal formation
explain where most of the matter in organic carbons comes from - Answer✔feces & remains if
organisms such as plants and animals
Recall the elevation of Mt. Everest - Answer✔8,848 (between 8,800 & 8,900)
Recall the reason for 'death zone' & where a death zone occurs - Answer✔there is insufficient
oxygen that prevents people from remaining above 8000 meters for more than 48 hours. It may
start to feel like a slow choke. There is trenchrous terrain, high winds & low temps. You will get
frost bite & blood vessels in the skin preserve core body temps. the body will use up it's store of
oxygen faster than breathing can replenish it
1|Page
BIO1500 Test 4 BUSH Exam Questions And
Answers |Latest 2025 | Guaranteed Pass
Explain how circular processes of photosynthesis & cellular respiration result in the cycling of
carbon within ecosystems - Answer✔Increase in PS relative to CR will increase O2. All carbon in
organic molecules comes from products of PS, the carbon gets put back into the air by being
consumed by animals/decomposers & release CO2 (Cr produces water & CO2 which PS uses to
make O2 & glucose which CR uses)
Explain the 2 reason for an imbalance in this cycle that led to the increased O2 during the
Carboniferous - Answer✔Land was full of plants, so lots of PS but lots of carbon was buried
instead of undergoing CR because these tress used lignin instead of cellulose which resulted in
no decomposers breaking it down; those carbon became fossil fuels
Describe the hypothesized reasons for the decline in O2 during the late Permian - Answer✔It
was a drier climate so there was a reduction in PS. Decomposition facilitated by sandy
sediments, fungi evolved to be able to break down lignin; more carbo enters CR so O2 levels
dropped
Explain the importance of lignin & lignin decomposition on the rise & fall of O2 levels during the
Carboniferous - Answer✔when lignin is present you have more O2 released into the
atmosphere & coal formation & bigger plants; lignin decomposition removes excess O2 from
the atmosphere & go back into organic carbons w/ no coal formation
explain where most of the matter in organic carbons comes from - Answer✔feces & remains if
organisms such as plants and animals
Recall the elevation of Mt. Everest - Answer✔8,848 (between 8,800 & 8,900)
Recall the reason for 'death zone' & where a death zone occurs - Answer✔there is insufficient
oxygen that prevents people from remaining above 8000 meters for more than 48 hours. It may
start to feel like a slow choke. There is trenchrous terrain, high winds & low temps. You will get
frost bite & blood vessels in the skin preserve core body temps. the body will use up it's store of
oxygen faster than breathing can replenish it
1|Page
