GCSE Sampling Techniques

Which of these are classed as abiotic factors that could affect a population?

• Light

• Temperature

• Pathogens

• Dissolved oxygen concentration

• Food availability

Which of these are classed as biotic factors that could affect a population?

• Light

• Temperature

• Pathogens

• Predators

• Carbon dioxide concentration

Fill in the blank: Members of the same rabbit population competing for grass as a food resource is an example of __(what?)__ competition? Check your spelling!

Random sampling is used to estimate a population of a species in a habitat. Which of these is NOT correct?

• We can just chuck the quadrat where we want to sample

• We must choose coordinates randomly to avoid being biased in our results

• We must take multiple readings and calculate a mean number

• This method only really works for plants and (very)slow moving animals

Which of the following (more than 1!) is true?

• Increasing the number of samples we take means our results are more representative

• In random sampling, taking samples at random will avoid being biased in our method

• In random sampling we need a tape measure to set out a grid of coordinates

• To estimate the total number of a population, we multiply the mean per m2 by the total area

Which of the following hypotheses would we use a transect sample for?

• Comparing the population of daisies growing on lawns at the front and back of a house

• Seeing if the height of stinging nettles changes as you move further away from a footpath

• Estimating the total population of strawberry plants in a farmer's field

• Investigating changes in the plant species present in sand dunes as you move further away from a beach

A student was randomly sampling to estimate a clover population. In 5 quadrats, they found 11, 8, 11, 9 and 1 clover plants. What is the mode for these results?

• 8

• 9

• 11

• 40

A student was randomly sampling to estimate a clover population. In 5 quadrats, they found 11, 8, 11, 9 and 1 clover plants. What is the mean for these results? Type out the number digits

Which of these formulae is for photosynthesis?

• CO2 + H2O -> Glucose + O2

• Glucose + O2 -> CO2 + H2O

• CO2 + O2 -> Glucose + H2O

• CO2 + Glucose -> O2 + H2O

What type of pathogen causes the disease malaria?

• Bacteria

• Protist

• Virus

• Fungus