Test Corrections Flashcards
Explain what is meant by the ecological term population
The number of organisms of one species in the same place
What information is required in order to calculate the growth rate of a population?
The population change
The number of births
The number of deaths
IN A GIVEN TIME
Describe how you would decide the number of quadrants to use in order to collect representative data
Time available to carry out work
How many needed to carry out a statistical test
More used for larger area of land
The ratio of the dry biomass of animals to the dry biomass of plants is always a lot less than one. Explain why.
Loss of energy between tropic levels as inefficient transfer
This is a result of respiration
Explain why the scientists sampled the nests at random
To avoid bias
So the data choice doesn’t influence results
Allows statistical tests
In a demographic transition give a factor that increases the birth rate
More people surviving until reproduction age
Describe what happens to pyruvate in anaerobic conditions and explain why anaerobic respiration is advantageous to human muscle
Forms lactate
NADH reduced to NAD
Allows glycolysis to continue
Forms ATP when oxygen not available
Why does a biology control sometimes become a pest
No competition Environment favourable E.g. Temperature, water availability More reproduction No pathogens to infect it
Advantages of biology control
Doesn’t leave chemical residues in environment
Can be used in organic farming
Pest can’t develop resistance
Doesn’t need to be reapplied
Disadvantages of biology control
Slow acting
Doesn’t get rid of pest completely
May become pest itself
If question with hardy Weinberg equation says frequency of allele is….how do you work it out?
Start at q instead of q2
Explain why the active ladybirds that heat up more quickly didn’t survive over winter
Heated up more quickly so
Increase in metabolism
Reserves not lasting long
Move so respire more
Select and evaluate evidence which supports the hypothesis
But May be another factor involved
Explain the link between sickle cell anaemia and resistance to malaria
One gene means likely to die from sickle cell anaemia and other gene means likely to die from malaria
