Required Practicals

Question 1

What substance is used to test for sugars (starch)?

Answer 1

Iodine - solution will turn black or blue-black

Question 2

What substance is used to test for sugars (glucose)?

Answer 2

Benedict solution - solution will turn green, yellow or brick red

Question 3

What substance is used to test for lipids ?

Answer 3

Sudan III - solution will turn red stained and float on the surface

Question 4

How does the osmosis experiment work?

Answer 4

• Measure out three different test tubes each two with different amounts of sugar and one without sugar
• E.g. 0.5m, 0.25m and 0m
• Put potato in each test tube and leave overnight
• In the morning, measure the mass of each potato

Question 5

How does the photosynthesis experiment work?

Answer 5

• A plant is underwater in a test tube
• The light is tested at different ranges
• Measure the amount of bubbles per minute with the light source at different distances