Year 7 EOY Revision
1.
The diagram shows two dodgem cars at a fairground. The circuit symbols for the motor and
pedal for each dodgem car are shown on the diagram.
pick-up wire
connection
to wire mesh
wire
mesh
power
supply
connection
to metal
floor
metal floor
metal wheel
(a)
Complete the following sentence.
Each dodgem car is connected to the power supply through the
......................................... which is in contact with the wire
mesh, and through the ......................................... which is
in contact with the metal floor.
1 mark
(b)
Dodgem cars are connected using parallel circuits.
Complete the circuit diagram below for the two dodgem cars.
Use two motor symbols,
M
, and two switch symbols,
.
The power supply for the circuit has been drawn for you.
connection
to wire mesh
power
supply
connection
to metal
floor
2 marks
(c)
Even when the power supply is switched on, the dodgem car will not move until the
pedal is pressed. Give the reason for this.
.....................................................................................................................
.....................................................................................................................
1 mark
(d)
A man looks after the dodgem cars during the rides.
Why does the man not get an electric shock as he walks across the metal floor?
.....................................................................................................................
.....................................................................................................................
1 mark
(e)
During one ride, the two dodgem cars are running. The pick-up wire on one car snaps
off. Describe how this affects:
(i)
the dodgem car with the broken pick-up wire;
.............................................................................................................
1 mark
(ii)
the other dodgem car.
.............................................................................................................
1 mark
Maximum 7 marks
2. The diagram shows a section through the female reproductive system.
oviduct
(fallopian tube)
uterus
ovary
cervix
vagina
(a)
(i)
What happens at fertilisation?
.............................................................................................................
.............................................................................................................
1 mark
(ii)
In which labelled part of the female reproductive system does fertilisation
normally take place?
.............................................................................................................
1 mark
(iii)
In which labelled part of the female reproductive system does the foetus
develop?
.............................................................................................................
1 mark
(b)
Some women have blocked oviducts.
How do blocked oviducts prevent fertilisation taking place?
.....................................................................................................................
.....................................................................................................................
1 mark
(c)
When a baby is born it is pushed out of the mother's body.
Describe what happens in the wall of the uterus to push the baby out.
.....................................................................................................................
.....................................................................................................................
1 mark
Maximum 5 marks
3. The diagram below shows a single-cell organism called Chlamydomonas. It lives in pond water.
cell wall
cytoplasm
red, light–sensitive spot
chloroplast
starch grain
nucleus
cell membrane
Use the information in the diagram to help you answer the questions below.
(a)
Give two features of Chlamydomonas which show that it is more like a plant cell than
an animal cell.
1. ......................................................................................................................
2. ......................................................................................................................
2 marks
(b)
Chlamydomonas makes a sugar called glucose.
(i)
Give the name of the process in which Chlamydomonas makes glucose.
.................................................................................................................
1 mark
(ii)
Chlamydomonas produces starch grains from glucose.
Suggest what will happen to the number of starch grains in the cell if
Chlamydomonas is kept in the dark.
.................................................................................................................
1 mark
(c)
The diagram below shows another single-cell organism called Amoeba.
It also lives in pond water. Amoeba traps a Chlamydomonas and digests it.
not to scale
Starch is a carbohydrate. Amoeba's digestive enzymes break down the starch in the
Chlamydomonas.
Suggest what substance is produced from the starch and what it is used for.
..........................................................................................................................
..........................................................................................................................
..........................................................................................................................
2 marks
Maximum 6 marks
4. Jessica was investigating the rusting of iron. She set up five experiments as shown
below, and left the test-tubes for three days.
A
B
iron nail in distilled water
D
C
iron nail in tap water
which has been boiled to
remove dissolved gases
iron nail and a chemical
to absorb water vapour
E
iron nail in sea water
iron nail in vinegar
Jessica wrote the following results in her book.
Test–tube
(a)
observation
A
nail slightly rusty
B
nail still shiny
C
nail still shiny
D
nail very rusty
E
nail slightly rusty, bubbles of gas seen
Explain why the nails had not rusted in test-tubes B and C.
in test-tube B ……………………………………………………………………….
………………………………………………………………………………………..
in test-tube C ……………………………………………………………………….
………………………………………………………………………………………..
2 marks
(b)
In test-tube E the iron nail reacted with the vinegar.
(i)
Is vinegar acidic, alkaline or neutral?
………………………………….
1 mark
(ii)
When the iron reacted with the vinegar, bubbles of gas were formed.
What gas was formed?
………………………………….
1 mark
(c)
Before putting the iron nail in test-tube D, Jessica weighed the nail.
After three days she dried and weighed the nail and the rust which had formed.
(i)
How did the total mass of the nail and rust compare to the mass of the nail
at the beginning?
…………………………………………………………………………………
1 mark
(ii)
Give the reason for your answer.
…………………………………………………………………………………
…………………………………………………………………………………
1 mark
(d)
Jessica concluded that the presence of salt in the water made the nail rust more
quickly.
Explain why she drew that conclusion from her experiments.
………………………………………………………………………………………..
………………………………………………………………………………………..
………………………………………………………………………………………..
1 mark
Maximum 7 marks
5.
The drawing shows some of the animals which live at the bottom of the North Sea.
prawn
starfish
hunting
for clams
tube worms
clam feeding on
plant remains in
the sediment
sediment
containing
the remains
of plants
not to scale
WWF - UK Data Support For Education Service
(a)
Suggest two advantages clams get from living in the sediment.
1. …………………………………………………………………………………….
……………………………………………………………………………………….
2. …………………………………………………………………………………….
………………………………………………………………………………………..
2 marks
(b)
Part of a food web in the North Sea is shown below.
Herring, sandeels and cod are types of fish. Puffins are sea birds.
cod
puffins
herring
sandeels
tiny 'animals'
tiny 'plants'

Herring lay eggs in the gravel on the seabed.

Sandeels live where the seabed is covered with sand.
Millions of cubic metres of gravel and sand are removed from the bottom of the
North Sea every year for roads and buildings.
(i)
Give one way removing some of the sand and gravel might cause the
numbers of herring and cod to decrease.
herring ……………………………………………………………………….
……..………………………………………………………………………….
..……………………………………………………………………………….
1 mark
cod ..………………………………………………………………………….
..……………………………………………………………………………….
..……………………………………………………………………………….
1 mark
(ii)
Explain why removing some of the sand has led to a decrease in the
number of puffins.
..……………………………………………………………………………….
..……………………………………………………………………………….
..……………………………………………………………………………….
2 marks