AQA Combined Science Practical Quiz

What are the three practicals covered in the AQA Combined Science 2022 exam?

• Food tests, chemical reactions, and cell division

• Microscopes, food tests, and photosynthesis

• Photosynthesis, cell division, and chemical reactions

• Microscopes, chemical reactions, and photosynthesis

How do you calculate the total magnification of a microscope?

• Divide the eyepiece magnification by the objective lens magnification

• Add the eyepiece and objective lens magnifications

• Subtract the objective lens magnification from the eyepiece magnification

• Multiply the eyepiece and objective lens magnifications

What is the purpose of adding iodine when preparing a microscope slide?

• To clean the slide

• To stain the cells

• To protect the lens

• To magnify the image

Which solution is used to test for the presence of starch in food samples?

• Benedict's solution

• Biuret solution

• Iodine solution

• Sudan III

What color change indicates a positive test for sugar using Benedict's solution?

• Blue to black

• Blue to orange

• Orange to green

• Purple to blue

What is the main indicator of photosynthesis rate in the pond weed experiment?

• The color of the pond weed

• The number of bubbles produced

• The temperature of the water

• The size of the pond weed

How does moving the lamp closer to the pond weed affect the rate of photosynthesis?

• Decreases the rate

• Increases the rate

• Has no effect

• Stops the process

What is the independent variable in the photosynthesis practical?

• The type of pond weed

• The temperature of the water

• The number of bubbles per minute

• The distance between the lamp and the pond weed

Which of the following is a control variable in the photosynthesis experiment?

• The distance between the lamp and the pond weed

• The number of bubbles per minute

• The type of pond weed

• The time of day

Why might an LED lamp be used in the photosynthesis practical?

• To increase the heat

• To reduce the heat

• To change the color of light

• To make the setup more complex