Conservation and Cycles Flashcards
What is the general term used to describe the variation in the living world? 1 mark
- Biodiversity
What is ecosystem diversity? 1 mark
- Number of different habitats in a particular area
How does removing hedgerows affect biodiversity? 2 marks
- Removal of habitats
- Decrease in biodiversity
How does the absence of crop rotation affect biodiversity?2 marks
- Nutrients don’t get replenished
- Decrease in biodiversity
How does filling in ponds affect biodiversity? 2 marks
- Decrease in habitats
- Decrease in biodiversity
Give two reasons why conservation is carried out? 2 marks
- Protect environments for future generations
- Cultural and aesthetic reasons
Why do conservationists manage succession? 2 marks
- Stopping a climax community from developing
- Ecosystem is preserved in its current state
Grazing affects succession. Explain how overgrazing and under grazing affects it. 4 marks
Overgrazing - less habitats + not enough food sources so less species
Under grazing - uncontrolled growth + not enough space for growth
Give three reasons why nitrogen is so important to living organisms (3 marks)
- Growth
- Amino acids - proteins
- Chlorophyll - PHS
What is the function of nitrogen-fixing bacteria? 2 marks
- Change N2 gas to ammonia for plants to absorb as plants can’t absorb nitrogen gas
Which stages of the nitrogen cycle are aerobic? 3 marks
- Nitrogen fixation
- Decomposition
- Nitrification
Give one example of a mutalisitic relationship. 1 mark
- Fungi
Describe extracellular digestion. 2 marks
- Decomposers secrete enzymes to digest they them absorb the products of digestion
State the two stages of nitrificaiton. 2 marks
- Nitrites
- Nitrates
Explain how denitrification is prevented. 2 marks
- Farmers plough their fields to get a source of oxygen to their crops which prevents anaerboic respiration.
