YOSHE-Biology - Animal Survival-the need for food

Plus de détails

FOOD GROUPS

par KATERINA REN

Ask for and give direction

par Ruzana 3341

Energy Conservation

par Nadiehsda Anderson

Uses of Rivers

par Gurpreet Kaur

Biology - Animal Survival(the need for food)

chemical structure of food types

proteins

basic units they are built from-amino acids

elements present-carbon, oxygen, hydrogen, nitrogen

fats

basic units they are built from-fatty acids and glycerol

carbohydrates

basic units they are built from-glucose molecules

elements present-carbon, oxygen, hydrogen

chemical tests

for starch

2/ solution will turn blue/black if starch is present

1/ add 2 drops of brown iodine solution to food solution

for glucose

3/ if glucose is present, an orange precipitate will form

2/ heat in a water bath until it boils

1/ add a few drops of blue benedicts solution to food solution

main chemicals in foods

fats-store energy, insulation, make cell membranes

proteins-growth and repair

carbohydrates eg sugar and starch-provide energy

how organisms obtain their food

animals-eat plants or other animals

plants-make their own food by photosynthesis

why we need food-a source of raw materials for growth and as a source of energy.