biology 2

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  • Created by: siobhan5
  • Created on: 25-03-15 16:51
name the solution used to test a leaf for starch.
iodine solution
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what is the result of the iodine test for starch?
the regions containing starch will turn blue-black. Regions without starch will look yellowy-brown.
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what is the word equation for photosynthesis?
carbon dioxide+ water -------> glucose + oxygen.
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give three physical factors which affect the distribution of plants.
three of: temperature, availability of nutrients, water, oxygen, carbon dioxide, amount of water.
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why would there be little point in heating a greenhouse on a summer's day?
it will be hot enough anyway, so its a waste of energy. the rate of photosynthesis might stop if the temperature becomes too high.
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what is meant by the term 'limiting factor' in photosynthesis?
factors such as light, temperature, and carbon dioxide, which might prevent the rate of photosynthesis increasing above a certain point.
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what is the difference between mean and median?
the mean (average) is the total of all the readings divided by the number of readings. The median is the middle value of the range.
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why is it difficult to be sure an investigation in outdoor habitats is valid?
there are so many variables which are difficult to control.
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what is meant by 'reproducible' results?
a measurement is reproducible if the investigation is repeated by another person, or by using different equipment or techniques, and the same results are obtained.
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Card 2

Front

what is the result of the iodine test for starch?

Back

the regions containing starch will turn blue-black. Regions without starch will look yellowy-brown.

Card 3

Front

what is the word equation for photosynthesis?

Back

Preview of the front of card 3

Card 4

Front

give three physical factors which affect the distribution of plants.

Back

Preview of the front of card 4

Card 5

Front

why would there be little point in heating a greenhouse on a summer's day?

Back

Preview of the front of card 5
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