AQA A2 Biology Unit 4 The Nutrient Cycles FC

HideShow resource information
What is the definition of Biomass?
The total mass of living material in a specific area at a given time, usually measured as dry mass as water value is variable
1 of 20
What is the meaning of niche?
All conditions and resources required for an organism to survive, reproduce and maintain population
2 of 20
An organism that obtains food from dead or decaying remains of other organisms is called what?
Saprobiotic Microorganism (Saprophyte)
3 of 20
The flow of nutrients such as carbon and nitrogen flows in what shape?
Cyclic so is continuous
4 of 20
What type of organisms remove carbon dioxide from the air?
Photosynthetic organisms
5 of 20
Why is the Carbon dioxide concentration higher at night?
This is due to photosynthesis ceasing while respiration carries on
6 of 20
What human activities cause an increase in carbon dioxide?
Deforestation and Combustion of fossil fuels
7 of 20
Methane, water vapour and Carbon dioxide are all?
Greenhouse Gases
8 of 20
What do Saprophytes use to break down large insoluble molecules into smaller soluble molecules?
Enzymes
9 of 20
When decay is prevented what forms?
Fossils
10 of 20
The Earth's atmosphere is heating up due to?
The Greenhouse Effect where greenhouse gases are building up in the atmosphere so the sun's rays get trapped and heat up the atmosphere
11 of 20
Name consequences of global warming
Chance of reduced number of animal species due to the change in temperature causing them to migrate to places where they compete for niches,melting ice caps could cause extinction for species such as polar bears and low land may be flood
12 of 20
Name a possible benefit of global warming
Benefit could be more rainfall filling reservoirs, higher temperatures causing higher rate of photosynthesis so more productivity and a larger harvest
13 of 20
What are the 4 steps of the nitrogen cycle?
Ammonification, nitrification, nitrogen fixing and denitrification
14 of 20
In nitrification what compounds are converted and to what?
1. Oxidation of ammonium ions to nitrite ions (NO₂¯), 2. Oxidation of nitrite ions to nitrate ions (NO₃¯)
15 of 20
What are artificial fertilisers made of?
Mined from rocks and deposits then converted into different forms to give the appropriate balance of minerals , compounds contain nitrogen, phosphorus and potassium
16 of 20
Why is nitrogen required in plants?
Plants require minerals for growth, nitrogen is needed for proteins and DNA
17 of 20
What bad effects can nitrogen fertilisers cause?
Leaching and Eutrophication
18 of 20
What is leaching?
The process by which nutrients are removed from the soil
19 of 20
What is Eutrophication
The process by which nutrients build up in bodies of water
20 of 20

Other cards in this set

Card 2

Front

What is the meaning of niche?

Back

All conditions and resources required for an organism to survive, reproduce and maintain population

Card 3

Front

An organism that obtains food from dead or decaying remains of other organisms is called what?

Back

Preview of the front of card 3

Card 4

Front

The flow of nutrients such as carbon and nitrogen flows in what shape?

Back

Preview of the front of card 4

Card 5

Front

What type of organisms remove carbon dioxide from the air?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Ecology and biodiversity resources »