Life Processes

Question 1

Name the nutrients and the functions.

Answer 1

CARBOHYDRATES - fuel for body, uses glucose for energy. starch and sugar.
PROTEIN - growth and repair of tissues, muscles and bones.
LIPIDS - fats used as energy stores.
VITIMENS - vital nutrients. scurvy = deficiancy
MINERALS
FIBRE - help food move through digestive system. deficiancy = heart disease, constipation etc.
WATER - 70% of body is made of water, all chemical reactions take place. deficiancy = dehydration.

Question 2

Test for sugar?

Answer 2

Benedicts solution (blue) sample.
Heat in hot water.
If sugar is present, solution will turn green if a little sugar, yellow if more, red if lots.

Question 3

Test for starch?

Answer 3

Iodine solution sample.
Put on leaf.
If starch is present, will change from orange to blue-black.
If not it will stay orange.

Question 4

Test for Lipids

Answer 4

Add ethanol and water
shake
if lipids are present it will go cloudy white.

Question 5

Test for Proteins

Answer 5

Add the biuret.
If protein present will turn purple.