Bio - Section 1: Living organisms

Question 1

What are the characteristics of living organisms?

Answer 1

Nutrition, Respiration, Excretion of waste, Response to surroundings, Movement, Control of internal conditions, Reproduction, Growth and development

Question 2

How do plants respond to their surroundings?

Answer 2

By growing in the direction of light or gravity.

Question 3

Name the 3 main chemical elements that are found in carbohydrates.

Answer 3

Carbon, hydrogen and oxygen

Question 4

What type of biological molecules are made up of:
a) fatty acids and glycerol?
b) amino acids

Answer 4

a) lipids
b) proteins

Question 5

Describe the biuret test for proteins.

Answer 5

Add biuret solution to the sample and gently shake the mixture. If protein is present in the sample, the solution will go from blue to pink or purple. If not, the solution will stay blue.

Question 6

Describe the test for starch.

Answer 6

Add a few drops of iodine solution to the food sample. If starch is present, the colour will change from brown-orange to blue-black. If not, the colour will remain brown-orange.