food

Question 1

give two reasons why food in necessary

Answer 1

1. cellular respiration

2. energy store

Question 2

what are five elements as dissolved salts?

Answer 2

• sodium
• magnesium
• chlorine
• potassium
• calcium

Question 3

give three trace elements

Answer 3

• iron
• copper
• zinc

Question 4

what is the importance of water for organisms?

Answer 4

• good solvent
• essential for life- 70-95% makes up cell mass
• good heat absorber
• participates in some chemical reactions
• source of minerals
• control of cell shape

Question 5

give two animal minerals

Answer 5

1. calcium

2. iron

Question 6

state a role of calcium in animals

Answer 6

forms strong bones and teeth

Question 7

give a deficiency of calcium in animals

Answer 7

osteoporosis

Question 8

sources of calcium in animals are:

Answer 8

• milk

- cheese

Question 9

give a role of iron

Answer 9

forms haemoglobin to transport o2

Question 10

name a deficiency of iron

Answer 10

anaemia

Question 11

give two sources of iron

Answer 11

• spinach

- red meat

Question 12

name two plant minerals

Answer 12

• calcium

- magnesium

Question 13

give a role of calcium in plants

Answer 13

forms the middle lamella

Question 14

state two calcium deficiency in plants

Answer 14

• stunted plant growth

- leaves turn brown

Question 15

what is the role of magnesium in plants

Answer 15

forms the chlorophyll

Question 16

deficiency of magnesium in plants:

Answer 16

chlorosis or the leaves turn yellow

Question 17

name a water soluble vitamin

Answer 17

vitamin c

Question 18

sources of vitamin c:

Answer 18

citrus fruit

Question 19

name a functions of vitamin c

Answer 19

• needed to absorb iron

- form and maintain connective tissue

Question 20

name a deficiency of vitamin c

Answer 20

scurvy

Question 21

name a fat soluble vitamin

Answer 21

vitamin d

Question 22

give two sources of vitamin d

Answer 22

milk , liver

Question 23

what is the function of vitamin d

Answer 23

absorb calcium

Question 24

name a deficiency of vitamin d

Answer 24

rickets in children

Question 25

name the protein elements

Answer 25

- carbon - hydrogen - oxygen - nitrogen

Question 26

how many common amino acids are there?

Answer 26

20

Question 27

where does photosynthesis occur

Answer 27

in the ribosome

Question 28

what are prions

Answer 28

proteins that do not fold correctly and cam cause disease like bse

Question 29

give two classification of protein

Answer 29

fibrous | globular

Question 30

give an example of a fibrous protein

Answer 30

keratin

Question 31

give an example of a globular protein

Answer 31

enzyme

Question 32

sources of protein are found:

Answer 32

red meat, fish, eggs, milk

Question 33

what is a monosaccharide?

Answer 33

carbohydrates made of single sugar units

Question 34

what is a disaccharide?

Answer 34

carbohydrates made of two sugar units joined together

Question 35

what is a polysaccharide

Answer 35

carbohydrates made of many sugar units joined together

Question 36

name sources of carbohydrates

Answer 36

potato, bread , rice , pasta

Question 37

what is fibre

Answer 37

indigestible cellulose

Question 38

what is a phospholipid

Answer 38

a fat-like substance where one fatty acid is replaced by a phosphate group

Question 39

what is the difference between fats and oil?

Answer 39

fats are solid at room temp | oil is liquid at room temp

Question 40

name a metabolic role for lipids in cells

Answer 40

energy store

Question 41

name the basic unit that makes up lipids

Answer 41

triglyceride

Question 42

name a polysaccharide in animals

Answer 42

glycogen

Question 43

name a structural role in lipids

Answer 43

membranes

Question 44

name a non-metallic element found in food that is not C, H , O, N

Answer 44

sulphur

Question 45

name a metabolic role of protein

Answer 45

enzymes

Question 46

name a structural role of protein

Answer 46

keratin

Question 47

what is the simplest unit of carbohydrates?

Answer 47

monosaccharide

Question 48

name 2 polysaccharide found in plants

Answer 48

- cellulose | - starch

Question 49

name a carbohydrate always found in dna

Answer 49

deoxyribose

Question 50

state two functions of minerals in organisms

Answer 50

- formation of soft tissue | - formation of fluid