Term
| Name the equipment used in a lab to maintain a constant temperature. |
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Definition
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Term
| Name the equipment used to sample plants and slow moving animals. |
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Definition
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Term
| Name the equipment used to sample ground crawling invertebrtates. |
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Definition
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Term
| Name the equipment used to measure rate of respiration. |
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Definition
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Term
| Name the equipment used to measure transpiration rate in plants. |
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Definition
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Term
| Name any independent variable that could be investigated using a potometer. |
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Definition
| temperature, surface area, wind speed, humidity |
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Term
| Why do investigations include a control experiment? |
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Definition
| to compare the results of an experiment when no treatment is applied |
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Term
| How would a control experiment be different from the main experiment? |
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Definition
| a contol experiment would have the factor thought to cause the result removed / replaced by inactive treatment. All other aspect of the contorl would be exactly the same as the main experiment |
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Term
| How can you ensure the results of an investigation are valid? |
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Definition
| change only the independent varaible and keep all other variables the same |
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Term
| In an investigation into the effect of pH on enzyme activity which variables should be controlled to make the resulst valid? |
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Definition
| temperature, concentration of enzyme, concentration of substrate, volume of enzyme, volume of substrate, mass of any solids, surface area of any solids |
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Term
| In an investigation into the effect of temperature on rate of photosynthesis which variables should be controlled to make the resulst valid? |
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Definition
| light intensity, carbon dioxide concentration, type of plant |
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Term
| How can you ensure the results of an investigation are reliable? |
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Definition
| repeat the experiment / take many samples and calculate an average. |
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Term
| What is the term for the variable changed / being investigated? |
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Definition
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Term
| What is the term for the variable being measured as the results in an investigation? |
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Definition
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Term
| Which variable will be on the x axis of a graph? |
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Definition
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Term
| Which variable will be on the y axis of a graph? |
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Definition
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Term
| How is the line on a line graph drawn in biology? |
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Definition
| straight line (drawn with a ruler) from each point to the next point [dot-to-dot] |
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Term
| Does the line in a line graph always start in the origin (the corner of the x and y axes)? |
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Definition
| NO! only start the line in the origin IF there is a point plotted there |
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Term
| What two things should go on the label of the x and y axes of a graph? |
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Definition
| the name of the variable AND the correct unit |
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Term
| What makes a good scale on an x or y axis of a line graph? |
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Definition
| numbers that go up in regular steps (e.g. 2s, 5s, 10s, 100s)& numbers that are evenly spaced out (use the darker grid lines). |
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Term
| When describing the results of an investigation, what should you include in your answer? |
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Definition
| descriptions should include DATA (numbers) e.g. as the temperature increases from 0 to 40 degrees the enzyme activity increased. |
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Term
| Using IV for independnet variable and DV for dependent variable write an example AIM. |
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Definition
| To investigate the effect of IV on DV. |
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Term
| Apart from the results of an investigation, what should you look at before writing a conclusion? |
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Definition
| the AIM of the investigation (your conclusion should mention the effect of the IV on the DV) |
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Term
| What are the two steps for calculating an average from a list of numbers? |
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Definition
| 1. add up the numbers 2. divide the total by the number of numbers added up. |
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Term
| What are the three steps for calculating a percentage change (increase or decrease)? |
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Definition
| 1. calculate the change (increase or decrease) 2. divide the change by the starting value 3. multiply the answer from step 2 by 100. |
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Term
| What are the two steps for calculating an average over time? |
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Definition
| 1. calcualte the total change in the variable 2. divide the change by the total time period |
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Term
| How do you do a 'times greater' calculation? |
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Definition
| divide the bigger number by the smaller number |
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Term
| How do you do a 'simple whole number ratio' calculation? |
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Definition
| write the numbers in the order they are asked about in the question; 1st try dividing the smallest number into the other number(s); if that doesn’t give a whole number then find the biggest common denominator for all the numbers. |
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Term
| Simplify this ratio - 15 : 12 |
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Definition
| biggest common denominator = 3 , 15 / 3 = 5 , 12 / 3 = 4, ratio = 5: 4 |
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Term
| Simplify this ratio - 20 : 10 : 2 |
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Definition
| divide all numbers by 2, ratio = 10 : 5 : 1 |
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Term
| A plant grows from 10cm to 25cm tall. Calculate the % increase in height of the plant? |
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Definition
| increase = 25-10 = 15; change divided by starting numebr = 15 / 10 = 1.5, multiply by 100 = 1.5 x 100 = 150% |
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Term
| Average plant growth with fertiliser is 40cm. Average plant growth without fertiliser is 32cm. Calculate how many times greater plant growth is with fertiliser compared to plant growth without fertilser? |
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Definition
| with = 40, without = 32; 40 / 32 = 1.25 times |
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