Exam (elaborations)
AQA A Level Environmental Science Biogeochemical Cycles Exam Practice Test
- Course
- Institution
AQA A Level Environmental Science Biogeochemical Cycles Exam Practice Test
[Show more]
Content preview
AQA A Level Environmental ScienceBiogeochemical Cycles
Exam Practice Test
the carbon cycle - Answer>> - naturally in a state of dynamic
equilibrium with processes cancelling each other out
- little or no overall charge in the amount of carbon in each
amount of carbon
carbon cycle processes: photosynthesis - Answer>> - captures
light energy using chlorophyll
- converts low energy substances such as carbon dioxide and
water into high energy carbohydrates
- carbohydrates can be converted into proteins, lipids, amino
acids
carbon cycle processes: respiration - Answer>> - releases the
energy that was captured during photosynthesis
- energy used to drive metabolic processes
- aerobic respiration returns carbon into the atmosphere as
carbon dioxide
- aerobic respiration breaks down organic compounds more
completely
- release more energy than anaerobic respiration
carbon cycle processes: food webs - Answer>> - plants eaten
by herbivores
- herbivores are eaten by carnivores
carbon cycle processes: fossilisation - Answer>> - incomplete
decomposition of dead organic matter under anaerobic conditions
can produce substances that form substances that have a high
carbon store
, carbon cycle processes: combustion - Answer>> - burning
organic material to release carbon dioxide
carbon cycle: human impacts: changes to photosynthesis -
Answer>> - deforestation reduces the movement of carbon
from the atmosphere into biomass
- afforestation increases the movement of carbon from the
atmosphere into the biomass
- marine pollution with toxic materials can reduce phytoplankton
populations which then reduces the absorption of dissolved
carbon dioxide
- carbon dioxide in the atmosphere would have dissolved in the
sea to maintain the balance between CO2 in the atmosphere and
the sea
- more toxic pollution that kills the phytoplankton leads to an
increase in atmospheric carbon dioxide levels
- algae that live on the underside of ice, some of the carbon
dioxide they absorb sinks to the seabed in the faeces of krill that
eat the algae
- if climate change reduces the sea ice then less CO2 may be
removed from the sea
carbon cycle: human impacts: changes in aerobic respiration -
Answer>> - carbon in DOM is gradually released as CO2 by
aerobic respiration of soil organisms--> bacteria and fungi
- ploughing increases the oxygen supply to decomposers so
aerobic decomposition takes place more rapidly
- the amount of carbon in the soil of DOM is reduced and amount
in atmosphere increased
carbon cycle: human impacts: changes in anaerobic respiration -
Answer>> - anaerobic soil organisms release methane gas
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller RevisionKing. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67866 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now