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1
Q

Explain what is meant by the ecological term population

A

The number of organisms of one species in the same place

2
Q

What information is required in order to calculate the growth rate of a population?

A

The population change
The number of births
The number of deaths
IN A GIVEN TIME

3
Q

Describe how you would decide the number of quadrants to use in order to collect representative data

A

Time available to carry out work

How many needed to carry out a statistical test

More used for larger area of land

4
Q

The ratio of the dry biomass of animals to the dry biomass of plants is always a lot less than one. Explain why.

A

Loss of energy between tropic levels as inefficient transfer

This is a result of respiration

5
Q

Explain why the scientists sampled the nests at random

A

To avoid bias

So the data choice doesn’t influence results

Allows statistical tests

6
Q

In a demographic transition give a factor that increases the birth rate

A

More people surviving until reproduction age

7
Q

Describe what happens to pyruvate in anaerobic conditions and explain why anaerobic respiration is advantageous to human muscle

A

Forms lactate
NADH reduced to NAD
Allows glycolysis to continue
Forms ATP when oxygen not available

8
Q

Why does a biology control sometimes become a pest

A
No competition
Environment favourable
E.g. Temperature, water availability 
More reproduction 
No pathogens to infect it
9
Q

Advantages of biology control

A

Doesn’t leave chemical residues in environment

Can be used in organic farming

Pest can’t develop resistance

Doesn’t need to be reapplied

10
Q

Disadvantages of biology control

A

Slow acting

Doesn’t get rid of pest completely

May become pest itself

11
Q

If question with hardy Weinberg equation says frequency of allele is….how do you work it out?

A

Start at q instead of q2

12
Q

Explain why the active ladybirds that heat up more quickly didn’t survive over winter

A

Heated up more quickly so
Increase in metabolism
Reserves not lasting long
Move so respire more

13
Q

Select and evaluate evidence which supports the hypothesis

A

But May be another factor involved

14
Q

Explain the link between sickle cell anaemia and resistance to malaria

A

One gene means likely to die from sickle cell anaemia and other gene means likely to die from malaria