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13 Cards in this Set
- Front
- Back
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How can plants be chosen at sampling sites to avoid bias and to be representative?2 |
Large sample Random coordinate generator |
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What information does the bar representing standard deviation represent? |
Spread of values around mean |
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Explaim why isotonic salt solution would be ised to dilute a blood sample? |
Same water potential No osmosis Cells wont swell |
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Define community |
Organisms of all species in an ecosysten |
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Define population? |
Organisms of 1 species in an ecosystem |
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2 conditions for validity of mark release recapture |
No immigration Non toxic marker Sample large enough No reproduction |
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Explain how you could use a quadrat to estimate the number of dandelion plants in a field? |
Coordinates on map Random number generator Count abundance and mean dandelion per quadrat Multiply for total field area estimate |
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Suggest how 2 species could have evolved as a result of sympatric speciation?4 |
2 species living in 1 area Genetic variability Reproductive isolation( dont interbreed) Mechanism- do not mate because dont recognise cues of other species Gene pools increasingly different Until interbreeding produces infertile offspring. |
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What is an ecosystem? |
All living and non living components of a particular area |
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Suggest how introduction of a new weed to a pond may reduce the diversity in the community?3 |
Competes for CO2 , light Some original plant species lost Loss of food sources Consumers die |
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Describe how seals affected the vegetation in tge quadrat over the period of time? |
Change is species composition Greater area on bare ground Lower diversity |
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Why are statistical tests important in analysis?3 |
Determines probability of chance Rejection/accepting Null hypothesis Determines significance if result |
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Describe how you could decide the number of quadrats to use to collect representative data?2 |
Running mean When enough quadrats levels out Enough for statistical test Large number for reliability |
