Manipulating Energy Transfers - Ecosystems

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Issues affecting primary productivity:
Actions to address issues:
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Limiting factors. How can this issue be addressed?
Optimal conditions e.g. carbon dioxide concentration, amount of water and the temperature.
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Organisms feeding on plants. Solution?
Use pesticides to eliminate pests feeding on plants.
3 of 17
Light levels (limiting photosynthesis) solution?
Use light banks or plant earlier for a longer growing season.
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Limited water. Solution?
Use irrigation systems or grow drought resistant varieties of plants.
5 of 17
Low temperature. Solution?
Use greenhouses or plant earlier in the year for a longer growing season to minimise impact of temperature.
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Lack of nutrients. Solution?
Use nitrogen-fixing varieties of plants e.g. beans, peas clover to replenish nitrate levels. Or use crop rotation methods to avoid depletion of certain nutrients.
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Competition. Solution?
Use herbicides to combat weeds.
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Fungal disease. Action?
Use fungicides or fungicide resistant varieties.
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Methods for improving secondary productivity:
Why it works/potential objections:
10 of 17
Using antibiotics.
To stop diseases from spreading from one animal to another. BUT could get into food chain and cause mutations.
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Minimal space for movement
Minimises energy lost through movement. BUT, animal welfare/cruelty.
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Harvest animals young before adulthood
Young put a lot of energy into growth and minimises loss of energy. BUT issues with animal welfare as doesn't allow sufficient life span.
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Use of steroids
Encourages rapid growth and increasing proportion of energy for growth. BUT issues in food produce and animal welfare. Outlawed in EU.
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Selective breeding
Select favourable traits e.g. higher milk/egg/growth production. BUT limits genetic diversity.
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Constant temperature (internal housing)
Avoids unnecessary use of energy to keep warm.
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Supplying perfectly balanced food mix.
Avoid unnecessary use of energy required to source food. Maximises growth potential with a perfectly balanced diet.
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Other cards in this set

Card 2

Front

Optimal conditions e.g. carbon dioxide concentration, amount of water and the temperature.

Back

Limiting factors. How can this issue be addressed?

Card 3

Front

Use pesticides to eliminate pests feeding on plants.

Back

Preview of the back of card 3

Card 4

Front

Use light banks or plant earlier for a longer growing season.

Back

Preview of the back of card 4

Card 5

Front

Use irrigation systems or grow drought resistant varieties of plants.

Back

Preview of the back of card 5
View more cards

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