The Egyptian British International School

Science year 7Revision

Name:…………………………………………….

Class:………………………………………………

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1. The diagram shows a helicopter in the air.

The arrows show the directions of the four forces which can act on it.

Two of the forces must be equal for the helicopter to stay at the same height.

a. Which two forces? ................... and ...................

The next diagram shows the sizes of the four forces at a different stage in its flight.

(b) Draw an arrow on this diagram to show which direction the helicopter

will move.

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(c) The helicopter is now on the ground and the engine is turned off.

It is on level ground and there is no wind blowing.

The next diagram shows the direction of one force, C, acting on the

helicopter.

(i) Write down the name given to force C.

...........................................................................................................................

(ii) One other force is acting on the helicopter when it is on the ground.

Draw an arrow on the diagram to show the direction of this other

force.

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2. Photosynthesis takes place in green leaves.

(a) Complete the word equation for photosynthesis.

Use the information in the diagram to help you. (b) Which of these statements are correct?

Tick (√ ) the boxes next to the two correct statements.

All plant cells carry out photosynthesis.

All animal cells carry out photosynthesis.

Photosynthesis is carried out by plants.

Photosynthesis takes place in chloroplasts.

Photosynthesis is the same as respiration.

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(c) Tomas knows light is needed for photosynthesis. He wants to find out what happens to photosynthesis in different coloured light.

He uses this equipment.

Bubbles of gas are produced during photosynthesis.Tomas counts the number of bubbles produced in a minute.Here are his results.

Light color Number of bubbles per minuteBlue light 7Red light 5

Green light 2

(i) How could Tomas make his results more reliable?

………………………………………

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(ii) Draw a bar chart to show Tomas’ results.Remember to add labels.

(iii) What conclusion can you make from his results?………………………………………………………………………….

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3.The diagram shows a plant cell.

(a) Which two named parts are present in plant cells but not in animal cells?

1………………………

2………………………

(b) Choose words from the list to complete the sentences below.

Membrane wall chloroplast cytoplasm nucleus

1. The …………. is a structure that contains genetic information.

2.The …………. is a structure in which photosynthesis takes place

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4. Some students are investigating falling objects.

(a) Each object is dropped from a height of 2 metres.

Their results are shown in the table below.

(i) Which object travelled the fastest?

Write the correct letter.

……………………………….

(ii) All the objects have the same mass.

What might be different about the objects to make some fall faster

than others?

……………………………………

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5. A boy is investigating the properties of materials. He puts four rods in a

beaker of boiling water.

After 3 minutes, he tests the temperature of each rod by touching the top.

(a) Which rod will feel hottest?

……………………………………………………………….

(b) Give one reason why plastic could be unsuitable as a stirring rod.

………………………………………………………………..

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6. Some students are planning an investigation to find which is the best

fertilizer for growing plants.

They have two fertilizers called ‘Flora’ and ‘Grofast’.

They also have the equipment in the diagram.

Before they start their investigation, the group of students talk about it.

Read what each student said about the investigation and then answer the

questions.

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(a) (i) Which student suggested using a fair test?

………………………………………………………………………

(ii) Explain why it would be a fair test.

………………………………………………………………………..

(b) To do this investigation, the students have to measure several things.

(i) State one thing that they could measure.

………………………………………………………………………..

(ii) Describe how they would measure it.

…………………………………………………………………………..

(iii) Explain why they would need to measure it.

…………………………………………………………………………..

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7. Materials have properties that are useful. Draw a line from the box with thepicture in to the box with the most important property. The first one has beendone for you.

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10. Suzanah sits on a large ball.The ball is filled with air

(a) A force acts downwards on Suzanah.

What is the force called?

……………………………………………………..

(b) Several of Suzanah’s friends climb on the ball with her.

It does not burst.

What happens to the ball?

………………………………………………………..

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11. Different materials are used for making different objects.

Draw a line from each picture to connect it to the property that is the most

important for the use shown

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12. The diagram shows what a root hair cell looks like when viewed with a

microscope.

(a) Identify the structures labelled A and B on the diagram.

A……………………

B ………………….

(b) Describe one way you can tell that this is a plant cell and not an

animal cell.

...................................................................................................

(c) Which cell structure, usually found in plant cells, is missing from root

hair cells?

…………………………………………………………………….

(d) Write down one function of a root hair cell.

……………………………………………………………………..

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13 . (a).Metals allow heat to pass through them easily. This is because

metals are

A conductors.

B ductile.

C insulators.

D malleable.

(b)What is the force of gravity on Earth?

A 100N per 1 kg

B 10N per 1 kg

C 1N per 1 kg

D 0.1N per 1 kgv

(c)Malleable means a metal is able to

A conduct heat.

B react with oxygen.

C be hammered flat.

D conduct electricity

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(d). The gravitational force on an object is stronger if the object

A has more mass.

B has less mass.

C is further away.

D moves slower.

(e) Which of these are forces?

1. friction 2. mass 3. heat 4. magnetic repulsion

A 1 and 2

B 1 and 4

C 1, 3 and 4

D 2 and 4

(h). James has a mass of 40 kg on Earth.

What is his weight on Earth?

A. 40 N

B. 400 N

C. 4 kg

D. 400 kg

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14. (a) The diagrams below show an animal cell and a plant cell.

(i) The lines from the boxes show the positions of two of the parts that

are present in both cells.

In the boxes, write the names of these two parts.

(ii) Give the names of two parts that are present in plant cells but

not in animal cells.

1…………………….

2…………………….

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.

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15.

(i)in the diagram above, which change of state takes place as clothes

dry?

A B C D

(ii)Which changes of state involve heat energy being added?

Tick the correct box.

A and B

B and C

C and D

D and A

17.Iron and steel will rust if they come into contact with water and air.

(a) What gas in the air combines with the iron to form rust?

………………………..

(b) Name two things that you could do to a steel fence to prevent it from

rusting.

1…………………….

.2 …………………………

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16.

18. student investigated the growth of two baby mice, one male and one

female.

She measured the length of each mouse’s tail each week starting when the

mice were 3 weeks old.

The diagram shows how the tails were measured.

The table shows her results. One measurement is missing.

(a) Use the information in the diagram to fill in the missing measurement.

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(b) The student drew this graph using the results for the female mouse.

Finish the graph using the results for the male mouse.

Draw in the graph of results for the male mouse on the same axes.

(c) How does the growth of the male mouse differ from the growth of the

female mouse?

………………………………………………

(d) The student thought she had a result which did not fit the pattern.

Do you agree? Explain your answer.

……………………………………………………………………….

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