Chemistry Study Notes

Topics: Digestion, Heart, Small intestine Pages: 37 (2897 words) Published: November 2, 2013
8A
8
A

Quick Quiz

On your answer sheet, write in or circle the correct letter for each question. 8Aa

3 Meats are a good source of which food
substance?

1 A food substance found in many foods is:
A carbohydrate.
C energy.

A fibre

D carbon dioxide.

B protein

C oxygen

B chalk.

D vitamins

4 Why do we need protein in our food?

2 What is used to test a food for starch?

A It is a good source of energy.

A iodine solution

B It is used for growth and repair.

B potatoes

C It is full of vitamins.

C Benedict’s solution
D Fehling’s solution
3 One of the ways in which water is used by
the body is as:
A a source of fibre.

D It helps food to pass through the gut
smoothly.
8Ac
1 Which organ is labelled X in the drawing
below?

B a source of energy.
C a solid.
D a solvent.
4 Fibre in your diet helps to stop:
A you lying.
B scurvy.
C constipation.
D digestion.

X

8Ab
1 You have a balanced diet when:
A the mass of all the food you eat in a
day adds up to 100 kg.
B the mass of all the food you eat one
day is equal to the mass you eat the
next day.

A small intestine
C liver

C you eat a wide range of different foods
to give your body all the things it needs.
D you only eat fish on Fridays.
2 Which of these people will need to eat the
most food in a day?
A a 3-year-old child

B stomach
D mouth

2 In the diagram above what does the organ
labelled X do?
A It mixes up food with acid and breaks
down proteins.
B It adds vitamins to the food.
C It takes the water out of the food.
D It stores waste food until it can be got
rid of.

B an 85-year-old woman
C a 35-year-old man, who works outside
cutting down trees
D a 25-year-old woman, who works in an
office using a word processor

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8A

Quick Quiz (continued)
3 The enzymes in humans work best at body
temperature. What temperature is this?

3 In digestion:
A soluble food substances are made into
insoluble ones.

A 37 °C

B insoluble food substances are broken up
into soluble ones.
C food is stored inside the body until it is
needed.
D waste food is removed from the body.

D 98 °C

4 The pH of the mouth is about pH7. The
conditions that enzymes in the mouth
work best at are:
B acidic.

C alkaline.

D basic.

8Ae

B salivas.

C digestifs.

C 100 °C

A neutral.

4 The main chemicals used to digest
foods are:
A vitamins.

B 0 °C

D enzymes.

1 When digested food is taken into the
blood it is said to be:

8Ad

A egested.

B ingested.

1 Which label shows the place where
digested food is taken into the blood?

C absorbed.

D insoluble.

2 Digested food is carried around the body
in the:
A digestive system.

A

B circulatory system.
C breathing system.
D nervous system.
3 What is the digested food used for inside
our bodies?
B

A to provide energy only
B to provide energy and chemicals to
make new substances

C

C to help us go to the toilet more easily
D to provide substances to make sure that
the blood does not become too runny

D

4 What job does an artery do?

2 The drawing shows a model gut. Which
part represents the inside of the small
intestine?

A carries water to be mixed with blood
B carries blood to the heart
C carries blood away from the heart
D carries blood to the brain only

A
B
C
D
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8
A

Word Sheets

8A

Word sheets that include new words from the ‘Focus on:’ pages are available on the Exploring Science website.

8Aa – On a diet
Word

Pronunciation

Meaning

constipation

con-stip-ay-shun

When the intestines get blocked up.

diet

The food that you eat.

fibre

feye-ber

Substance found in food which cannot be used by the body. It helps to...
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