B4 - Decay

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What are detritivores and what are some examples?
Feed on dead and decaying material. Earthworms, maggots and woodlice are some examples.
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How do detritivores increase the rate of decay?
They break up the detritus which increases surface area for further microbial breakdown.
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How can the rate of decay be increased?
Increasing temperature, oxygen and water
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What is the best temperature for bacteria to increase their rate of respiration?
37 degrees
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What is the best temperature for fungi to increase their rate of respiration?
25 degrees
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What will higher temperatures do to enzymes?
Denature them
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How does the amount of oxygen increase rate of decay?
Bacteria will use aerobic respiration to grow and reproduce faster
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How does the amount of water increase rate of decay?
Will allow for material to be digested and absorbed more efficiently and increase growth and reproduction of bacteria and fungi.
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What is a saprophyte?
An organism that feeds on dead and decaying material
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Why do fungi produce enzymes?
To digest food outside their cells and then reabsorb the simple soluble substances. This type of digestion is called extracellular digestion.
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What do food preservation methods do?
Slow down decay
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What happens in canning?
Foods are heated to kill bacteria and then sealed in a vacuum to prevent entry of oxygen and bacteria.
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What happens in cooling?
Slows down bacterial and fungal growth and reproduction
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What happens in freezing?
Will kill some bacteria and fungi and slow down their growth and reproduction
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What happens in drying?
Removes water so bacteria cannot feed or grow
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What happens in adding salt or sugar?
Will kill some bacteria and fungi, as the high osmotic concentration will remove water from them
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What happens in adding vinegar?
Will produce very acidic conditions killing most bacteria and fungi
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Other cards in this set

Card 2

Front

How do detritivores increase the rate of decay?

Back

They break up the detritus which increases surface area for further microbial breakdown.

Card 3

Front

How can the rate of decay be increased?

Back

Preview of the front of card 3

Card 4

Front

What is the best temperature for bacteria to increase their rate of respiration?

Back

Preview of the front of card 4

Card 5

Front

What is the best temperature for fungi to increase their rate of respiration?

Back

Preview of the front of card 5
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