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Yr 9 biology > Food Test And Digestion > Flashcards

Food Test And Digestion Flashcards

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1
Q

What is the test for starch

A

Add iodine
if starch present goes from yellow-brown to blue-black

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2
Q

What is the food test for sugar

A

Add Benedicts AND heat.
If sugar present goes from blue to green to brick red

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3
Q

What is the test for protein

A

Add Biuret
If protein present goes from blue to Purple

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4
Q

What is the test for fat

A

Add ethanol and water
Mix
If cloudy emulsion fat present

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5
Q

If food is burnt and energy release it can be used to heat water.
The equation to calculate energy in 1 g of food is:

Rise in temperature x volume of water x 4.2

If l burnt 5g of crisps and the temperature of 100cm3 of water went from 20 to 90 degrees C. How much energy in 1 g?

A

5g of crisps
Temperature rise = 70

Rise in temp x volume x 4.2 =
70 x 100 x 4.2 = 29400J in 5 g
In 1g of crisp then 29400/5 = 5880J

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6
Q

What is the unit for energy

A

Joule (J)

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7
Q

What is the hard outside part of the tooth called

A

Enamel

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8
Q

What is the name of the part of tooth that contains blood vessels and nerves

A

Pulp cavity

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9
Q

What is the living part of tooth found just below enamel

A

Dentine

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10
Q

What is the part of the tooth found above gums

A

Crown

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11
Q

What forms plaque

A

Plaque formed from bacteria in mouth reacting with food especially sugar
Will produce acid that burns a hole through enamel

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12
Q

What 2 food nutrients needed for strong teeth

A

Calcium and vitamin D

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13
Q

What do we need carbohydrates in diet for

A

Energy

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14
Q

What is protein needed for

A

Growth and repair

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15
Q

What is fat needed for

A

Energy store
Insulation

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16
Q

What is fibre needed for

A

Prevent constipation

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17
Q

What food are rich in starch

A

Potatoes
Pasta
Rice
Bread

18
Q

What foods are rich in sugar

A

Sweets
Fizzy drinks
Honey

19
Q

What foods are rich in protein

A

Fish
Meat
Eggs
Milk

20
Q

What foods contain fat

A

Oil
Butter
Sausages

21
Q

What is the name given when food enters the mouth

A

Ingestion

22
Q

What is digestion

A

Breaking down large insoluble molecules to small soluble molecules

23
Q

What is found in the stomach and what is it’s job

A

Acid (hydrochloric acid) to kill bacteria

24
Q

What is the wave like movement of material down the oesophagus called

A

Peristalsis

25
Q

What happens in the small intestine

A

Food is broken down (digested) by enzymes and then passes into the blood

26
Q

What 3 enzymes are used in digestion

A

Amylase, protease, lipase

27
Q

What do amylase break down

A

Breaks down starch to sugars

28
Q

What does protease break down

A

Protein to amino acids

29
Q

What does lipase break down

A

fats to fatty acids and glycerol

30
Q

What in the smallintestine helps make a large surface area for absorption of food into blood

A

Villi

31
Q

What food group will end up in the large intestine

A

Fibre

32
Q

What material gets absorbed into blood from large intestine

A

Water

33
Q

What is the name for removal of waste from digestive system

A

Egestion

34
Q

What are the front teeth called and their function

A

Incisors
To cut food

35
Q

What are the linty teeth called and job

A

Canine
Used to tear food

36
Q

What are the large teeth at back called

A

Premolars and molars - used to crush and grind food

37
Q

What is used in chemical digestion of food

A

Enzymes

38
Q

What is used in mechanical digestion of food

A

Teeth, tongue and stomach

39
Q

What adaptations do small intestine have to allow absorption of food

A

Thin walled
Villi to increase surface area
Good blood supply

40
Q

Balanced diet

A

Eating the right amount of each food group

41
Q

Unbalanced diet

A

Not eating the right amount of each food group

Yr 9 biology (3 decks)

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