AS CORE PRACTICALS UNIT 3B REVISION

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Effect of caffeine on Daphnia heart rate. Independent variable? Dependant Variable?
Independent: Caffeine concentration Dependant: Heart rate of daphnia
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Effect of caffeine on Daphnia heart rate. Controlled variables?
Temp, volume of solutions, stress of daphnia, size of daphnia, source of daphnia, time of acclimatisation
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Measuring the content of Vitamin C in fruit juice. Independent variable? Dependant variable?
Independent: fruit juice Dependant: Volume of juice needed to decolourise DCPIP
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Measuring the content of Vitamin C in fruit juice. Controlled variables?
Temp, concentration of DCPIP, shaking method, same end point colour,
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The effect of temperature on cell membranes. Independent variable? Dependant variable?
Independent: Temp Dependant: % transmission of light through resulting solution
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The effect of temperature on cell membranes. Controlled variables?
Volume of distilled water, time left in water bath, size of beetroot, source and age of beetroot
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The effect of changing enzyme concentration on the rate of reaction. Independent variable? Dependant variable?
Independent: concentration of enzyme Dependant: time taken for enzyme to break down substrate
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The effect of changing enzyme concentration on the rate of reaction. Controlled variables?
Temp, volume of enzyme, volume of substrate, concentration of substrate, pH
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Observing mitosis. Independent variable? Dependant variable? Controlled variables?
There are none
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Totipotency and tissue culture. Independent variable? Dependant variable? Controlled variables?
There are none
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The strength of plant fibres. Independent variable? Dependant variable?
Independent: source and type of fibre Dependant: Mass that can be held
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The strength of plant fibres. Controlled variables?
length of fibre, size of each individual mass, cross section of fibre, twisting or plaiting method
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Investigating plant mineral deficiencies. Independent variable? Dependant variable?
Independent: minerals present Dependant: physical characteristics of the plant
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Investigating plant mineral deficiencies. Controlled variables?
Volume of mineral solution, species of plant, size of container, amount of light received
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Role of mineral ions nitrate, calcium and magnesium in plants?
nitrate: making proteins, DNA and certain plant hormones Calcium: to form calcium pectate in plant cell walls, involved in membrane permeability Magnesium: as a component of chlorophyll
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Effect of garlic and mint on bacterial growth. Independent variable? Dependent variable?
Independent: presence of mint or garlic Dependent: Zone of inhibition around the disc
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Effect of garlic and mint on bacterial growth. Controlled variables?
concentration of plant mineral, crushing method, lawn of bacteria in petri dish, temp, contamination of petri dish by other microbes, same volume of plant material on each disc
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Definition and examples of social implications?
social- impacts human populations, in example living standards, housing, health, eduction, income, employment
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Definition and examples of ethical implications?
ethical- impacts on populations (debate always two sided), in example animal testing, genetic modification, stem cell research, abortion, performance enhancing drugs
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Definition and examples of environmental implictions?
environmental- impacts on plants, animals ecosystems, in example pesticides, global warming, food chains/webs, extinction, non native species, pollution
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Definition and examples of economic implications?
Economic- impacts on individuals or populations with regards to finance and expense, in example loss of income, labour costs, expensive, products/food/equipment/medicine
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What is reliability?
refers to the extent which an experiment yields the same result on repeated trials
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What is validity?
refers to the degree to which an assessment method measured what it is supposed to measure
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What is accuracy?
refers to how close the result of the experiment is to the true value
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What is Precision?
Precision depends on how well random errors are minimised, high scatter = low precision, low scatter= high precision
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Difference between random and systematic errors?
random= human errors Systematic = when the equipment goes wrong
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Define the independent variable and where is it plotted on a graph?
what you change, should be plotted on X-axis
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Define the dependent variable and where it is plotted on a graph?
what you measure, should be plotted on the Y-axis
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Where do you look for further scientific information?
Scientific journals, books, lectures, papers having gone through peer review, internet
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Correct way of referencing a book?
FAMILY/SURNAME, Initials. (Publication year in brackets) Book title - italicised or underlined. Series title and volume if applicable. Edition – if not the first. Place of publication: publisher.
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Correct way of referencing a website?
Author of website FAMILY/SURNAME, Initials or WEBSITE name if no author is available. (Year - in brackets) Title of website in italics or underlined. Any numbers if necessary or available if website is part of a series. [Online in square brackets] Av
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Correct way of referencing journal article?
Author(s) of article’s FAMILY/SURNAME, Initials. (Publication year in brackets) Title of article. Title of journal - italicised or underlined. Volume number (Part number/month in brackets). p. followed by the page numbers of the article.
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Card 2

Front

Effect of caffeine on Daphnia heart rate. Controlled variables?

Back

Temp, volume of solutions, stress of daphnia, size of daphnia, source of daphnia, time of acclimatisation

Card 3

Front

Measuring the content of Vitamin C in fruit juice. Independent variable? Dependant variable?

Back

Preview of the front of card 3

Card 4

Front

Measuring the content of Vitamin C in fruit juice. Controlled variables?

Back

Preview of the front of card 4

Card 5

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The effect of temperature on cell membranes. Independent variable? Dependant variable?

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Preview of the front of card 5
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