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Tool 1: Experimental Techniques
When preparing a temporary mount with which to view specimens under a light microscope, what is the main purpose of gently pressing onto the cover slip once it is in place?
To increase the magnification.
To remove air bubbles.
To remove excess stain.
To kill the specimen.
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What is an appropriate unit for comparing the length of genomes?
Micrometers
Nanometers
Picometer
Million base pairs
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Which of the following is a hazard to consider in a risk assessment when measuring abiotic factors in a natural environment?
Uneven ground.
Slipping on wet rock.
Cutting oneself on a sharp rock.
Breaking an ankle by falling over.
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When investigating osmosis in plant tissue any changes to mass and length are recorded over a period of time.
What are the most appropriate units of measurement for mass and length during this investigation?
kg and cm
g and cm
g and mm
kg and mm
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Sampling allows population size to be estimated; this can result in sampling errors.
What is a sampling error?
The difference between an estimated population size and a true population size.
The process of counting small samples of a population that will represent a whole population.
When some members of a population are more likely to be counted than others.
When positions of the sampling points are not selected at random.
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The stability of an ecosystem can be investigated using a mesocosm.
What ethical guidelines should be followed when using animals in a mesocosm?
I. Animals should be used in preference to alternative organisms.
II. Enough food should be available for any animals present.
III. Animals must be returned to their natural environment at the end of an investigation.
I and II only
II and III only
I and III only
I, II and III
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