BIO1500 Test 4 BUSH Questions and
Answers 100% Pass
Explain how circular processes of photosynthesis & cellular respiration result in the
cycling of carbon within ecosystems - ✔✔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 - ✔✔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 - ✔✔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
100% Pass Guarantee Sophia Bennett, All Rights Reserved © 2025 1
, Explain the importance of lignin & lignin decomposition on the rise & fall of O2 levels
during the Carboniferous - ✔✔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 - ✔✔feces & remains if
organisms such as plants and animals
Recall the elevation of Mt. Everest - ✔✔8,848 (between 8,800 & 8,900)
Recall the reason for 'death zone' & where a death zone occurs - ✔✔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
Recall the migration path of Bar Headed Geese & which feature makes it remarkable -
✔✔they migrate from India to the Mongolia by flying over the Himalayas mountains.
they can do this because they have more capillaries & more efficient red blood cells,
meaning their bodies can deliver more O2 to muscle cells faster; increase the net
quantity of O2 in blood)
100% Pass Guarantee Sophia Bennett, All Rights Reserved © 2025 2
Answers 100% Pass
Explain how circular processes of photosynthesis & cellular respiration result in the
cycling of carbon within ecosystems - ✔✔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 - ✔✔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 - ✔✔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
100% Pass Guarantee Sophia Bennett, All Rights Reserved © 2025 1
, Explain the importance of lignin & lignin decomposition on the rise & fall of O2 levels
during the Carboniferous - ✔✔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 - ✔✔feces & remains if
organisms such as plants and animals
Recall the elevation of Mt. Everest - ✔✔8,848 (between 8,800 & 8,900)
Recall the reason for 'death zone' & where a death zone occurs - ✔✔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
Recall the migration path of Bar Headed Geese & which feature makes it remarkable -
✔✔they migrate from India to the Mongolia by flying over the Himalayas mountains.
they can do this because they have more capillaries & more efficient red blood cells,
meaning their bodies can deliver more O2 to muscle cells faster; increase the net
quantity of O2 in blood)
100% Pass Guarantee Sophia Bennett, All Rights Reserved © 2025 2
