Paper 6

Question 1

What should you do for graphs in biology

Answer 1

Join them dot to dot unless the question tells you otherwise

Question 2

What is the independent variable?

Answer 2

The variable that is changed or controlled in an experiment to test the effects on the dependent variable

Question 3

What is the Dependent variable?

Answer 3

The variable that is being tested and measured in an experiment

Question 4

What is the control variable?

Answer 4

any variable that’s held constant in a research study

Question 5

What are some things you can do for safety?

Answer 5

It depends on questions but some examples are:

• Gloves
• Safety goggles
• Tongs for holding hot test tubes

Question 6

What are experimental errors?

Answer 6

It depends on the question but an example is:

• No experimental repeats Improvements: Do 3 repeats
• Contamination Improvement: Wash Apparatus

Question 7

What are the general rules for plotting a graph?

Answer 7

• X axis (independent variable), Y axis (dependent variable)
• Label axis with appropriate units
• Occupy at least half of the grid given

Question 8

What are the steps for Designing an experiment?

Answer 8

• Find the variable which is to be changed (from the question) and mention how you are going to change it (ex: to change temperature, use thermometer-controlled water bath at temperatures 10 to 50 degree Celsius).
• List all variables that you have to keep constant throughout the experiment
• Mention how long your experiment will last.
• Say how you will measure experiments’ results (ex: if you’re examining presence of starch, say that the food sample which turns the iodine solution a deeper blue contains more starch)
• *Finally: say ‘repeat experiment to get more reliable results and minimise error.
• If you can, set a control for your experiment. (ex: use boiled enzyme in an experiment to test for enzyme activity)
• mention safety precaution

Question 9

What is formula for magnification Biology?

Answer 9

Question 10

How do you convert to µm?

Answer 10

multiply by 1000 if units are in mm

Question 11

What are the rules for drawing tables in Biology?

Answer 11

• Use a ruler to draw the rows and columns
• Draw a border around the table
• Each column should have a heading and units next to the heading
• All the data should be in the same number of decimal places

Question 12

How do you change the pH of a solution?

Answer 12

Using buffer solution