B4 G-H

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  • Created by: Lilly
  • Created on: 15-11-14 14:02
What are microorganisms used for?
Microorganisms are used to break down human and plant waste.
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Why are microorganisms needed?
The presence of microorganisms is required for the process of decay.
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Explain why an increase in Temperature will speed up the rate of decay:
Because Microbes are able to respire faster and will grow and reproduce quicker in warmer conditions.
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Explain why an increase in Oxygen will speed up decay:
The more oxygen there is available, the faster the microbes will be able to respire. This will allow them to grow quicker and reproduce faster.
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Explain why in moist conditions decay is faster:
Microbes need water to remain healthy. In moist conditions the microbes will grow faster and reproduce more.
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What does the term Saprophyte mean?
Saphrophytes are organisms that feed off dead and decaying material
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What is the process of Saprotrophic feeding?
Saphrophytes digest material by releasing enzymes onto dead animals or plants. The enzymes digest the dead material in a process called extracellular digestion. The decomposers then absorb the digested chemicals.
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What are Detritivores?
Detritivores, eat small parts of the dead material, which they digest and then release as waste.
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What are some example of detritivores?
*Earthworms. *Maggots. *Woodlice *Millipedes.
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Explain why keeping food in a fridge preserves decay for some time?
Because food which is placed in a fridge is kept at a approximate temperature of 4°C, at this temp the reproduction of decomposers is slowed down.
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What are pests?
Pests are any organisms that damage crops.
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What are the the disadvantages of using pesticides?
• Entering and accumulating in food chains • Harming organisms that are not pests •Persisting in the environment for a long time
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What are the advantages of hydroponics?
•The technique gives better control of the minerals needed by the plant. • There is better use of space. • Water is recycled, reducing waste. • Disease can be controlled inside the glasshouse.
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What are the disadvantages of hydroponics?
• There is no support for the plant as roots are not anchored in the soil, so a frame or tray is needed. • Because there is no soil to hold & store minerals, fertilisers needed to be added constantly as dissolved minerals.
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What are the views of intensive farming?
Intensive farming methods may be efficient but they raise ethical dilemmas
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Explain how intensive food production improves the efficiency of energy transfer by reducing energy transfer:
Organic farming does not use artificial fertilisers or pesticides
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What does organic farming NOT do?
Organic farming does not use artificial fertilisers or pesticides
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Describe organic farming techniques:
* Use of animal manure and compost *Crop rotation including use of nitrogen-fixing crops *Weeding *Varying seed planting times.
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What is biological control?
Biological control is the use of predators to reduce populations of pests
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What are the advantages of Biological Control?
•No need for chemical pesticides. •Does not need repeated treatment.
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What are the disadvantages of Biological Control?
•Predator may not eat pest but may eat useful species. • Predator population may increase out of control or move from the area in which it is needed.
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Other cards in this set

Card 2

Front

Why are microorganisms needed?

Back

The presence of microorganisms is required for the process of decay.

Card 3

Front

Explain why an increase in Temperature will speed up the rate of decay:

Back

Preview of the front of card 3

Card 4

Front

Explain why an increase in Oxygen will speed up decay:

Back

Preview of the front of card 4

Card 5

Front

Explain why in moist conditions decay is faster:

Back

Preview of the front of card 5
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