Biology
Grade-10
Easy
Question
What is the best technique to ensure that quadrats are placed at random?
- Without looking, toss them over your shoulder.
- To choose positions, construct a grid and utilize random number tables.
- Place some along the perimeter and some in the center of the space.
- Place them at regular intervals, such as every 10 steps.
Hint:
To choose positions, construct a grid and utilize random number tables
The correct answer is: To choose positions, construct a grid and utilize random number tables.
Use a suitable method – you could draw numbers out of a hat – to generate a pair of random coordinates on your grid. Place the first quadrat on your grid using these coordinates. Count the number of different species within this quadrat (the species richness).
Quadrats should be placed randomly so that a representative sample is taken. Many quadrats should be placed so that a representative sample is taken. Quadrats may also be used for slow moving animals such as snails/slugs.
A tape is place along two sides of the area being studied. Random coordinates are found: the length of one side of the quadratic forms the sampling interval.
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