Q8 Revision Quiz

Which reagent is used to test for the presence of starch?

• Biuret reagent

• Benedict’s solution

• Iodine

• Sudan III

What is the expected result of the lipid test on butter using brown paper?

• 
  Brown colour change

• Translucent spot

• Blue-black colour change

• Purple color change

What reagent is used to test for the presence of protein?

• Iodine

• 
  Biuret reagent

• 
  Benedict’s solution

• 
  Ethano

Which food test requires the use of a water bath?

• Starch test

• Lipid test

• 
  Reducing sugar test

• Protein test

What colour change indicates the presence of reducing sugars with Benedict’s solution?

• Blue to green

• Blue to brick red

• Brown to black

• Clear to purple

Why is water used as a control in food tests?

• To increase the reaction speed

• 
  To compare with a substance lacking the tested nutrient

• To react with the reagent

• To dilute the food sample

What is the purpose of using iodine when preparing a plant cell slide?

• 
  To dissolve the cell wall

• To stain the nucleus for visibility

• 
  To make the cell membrane clearer

• To enhance the cell wall visibility

Which part of the microscope is used for fine focusing?

• Coarse focus knob

• Fine focus knob

• Objective lens

• Eyepiece lens

What structure is stained dark brown in a prepared onion epidermis cell?

• 
  Nucleus

• Cytoplasm

• Chloroplast

• Ribosome

What magnification is achieved with a 10x eyepiece lens and a 40x objective lens?

• 10x

• 50x

• 400x

• 40x