Lesson Worksheet: Investigating Ecosystems Biology
In this worksheet, we will practice recalling how to sample ecosystems to estimate population sizes and investigate the distribution and abundance of organisms in their environment.
Which of the following techniques will ensure that samples with a quadrat are taken randomly? Select all that apply.
- AThe area to be sampled is separated into grids, and the person sampling starts at the first grid and samples all until they reach the end.
- BThe area to be sampled is separated into numbered grids, and a random number generator is used to choose sample areas.
- CThe person sampling identifies the areas of the field where the species being sampled shows the most abundance, and then they place the quadrat there.
A student wants to investigate how the abundance of daisies changes from a shaded area to an unshaded one. Which method of sampling should they use?
- ARandom sampling
- BLine transect sampling
Which of the following best defines random sampling?
- ARandom sampling is a method of randomly selecting organisms to investigate in an area.
- BRandom sampling is a method of preselecting the samples to ensure only productive areas are chosen.
- CRandom sampling is a method of selecting samples by chance, and every sample has an equal probability of being chosen.
- DRandom sampling is a method of selecting samples to ensure the best results.
A general method for using a line transect is outlined below, with some key words removed:
- Lay a tape measure along the ground.
- Place X at the first measurement point.
- Record the Y of your selected organism.
- Repeat at Z intervals.
Which of the following words would correctly replace X?
- AA quadrat
- BA sample
- CA tape measure
- DA student
Which of the following words would correctly replace Y?
Which of the following words would correctly replace Z?
- AA few
A student wants to estimate the general abundance of dandelions in a large field. What method of sampling should they use?
- ALine transect sampling
- BRandom sampling
The graph provided shows the effect of shade on the number of different plant species in a given area. What is the trend shown by these results?
- AThe more shaded an area is, the more plant species can grow in it.
- BThe less shaded an area is, the more plant species can grow in it.
- CThere is no correlation between shade and number of plant species.
Quadrats can be used to estimate the numbers of slow-moving animals. Example results for an investigation into the abundance of slugs in a field are provided in the table.
|Number of Slugs||4||3||2||4||3||6||1||2||1||3|
Calculate the mean number of slugs per quadrat, giving your answer to one decimal place.
A quadrat can be used to estimate the distribution of species in an area. What is meant by distribution?
- ADistribution is how far organisms have to travel to find mates.
- BDistribution is where a species is found within a given area or ecosystem.
- CDistribution is how much space is available between different species in an ecosystem.
- DDistribution is how common a particular species is in a given area or ecosystem.
A quadrat can be used to estimate the abundance of a species in a given area. What is meant by abundance?
- AAbundance is how common a particular species is in a given area or ecosystem.
- BAbundance is how well adapted a particular species is for a given area or ecosystem.
- CAbundance is how frequently an organism visits a particular area or ecosystem.
- DAbundance is where a species is found within a given area or ecosystem.
A student used a quadrat to sample how many flowers were present in an area of a school field. The student then drew the results, which are provided here. What is the abundance of flowers present in this quadrat?