Sandy did a study on the reproduction of two animals, A and B. She then recorded her observation in the graphic organizer below.
Which one of the following sets of animals did Sandy study?
|ANIMAL A||ANIMAL B|
Mei Mei conducted an experiment to find out how bean sprouts grow under certain conditions. The steps she took were:
Step 1: She filled 2 similar containers with damp cotton wool.
Step 2: She placed 3 bean sprouts in each container.
Step 3: She placed one container near a window and the other in a dark cupboard.
Step 4: She watered the two containers with an equal amount of water every day.
Mei Mei was trying to find out whether been sprouts need ______________ to grow well.
Study the pictures of some fruits.
How are the fruits above dispersed?
Wind and animals play an important role the reproduction of plants. Which of these processes make use of the wind or animals?
B: seed dispersal
A, B and C only
The cell shown below performs a function that results in the formation of a baby.
In which of the following systems does the cell shown above fuse with another?
A mechanic adds oil to the wheel of a pulley to ensure that it turns smoothly. How does oilng the wheel help the worker?
It reduces friction between the worker's hands and the rope.
Study the two gears below.
Gear A has 20 teeth ad Gear B has 10 teeth. When Gear A makes three complete rounds, how many rounds does Gear B make?
Linda measured the effort required to raise a load along a plank, changing the angle of the slope with each try. Study the diagram and the table below carefully.
|Angle of slope||35||45||55||65|
Which of the following variables did she keep the same?
A: The load used
B: Length of the plank
C: The angle of the slope
D: The surface of the pank
Refer to the previous question.
What could Linda conclude from this experiment?
In which one of the simple machines is the force used less than 8 kg?
A and C only
The diagram above shows the arrangement of load, fulcram and effort of the wheelbarrow. Which of these machines have the same arrangement as the above?
Jason is on a see-saw with two younger boys A and B.
If Jason wants to balance the see-saw again, where should he sit?
Which of the wheels requires the least effort to raise a 5 kg load?
Rayson used a simple machine to move a load. He plotted the following graph to show the relationship between the distance moved by the load and the effort.
Which of the following simple machines would produce results as shown in the graph above?
Mary used a simple machine to lift a load. She then drew the concept map above.
What kind of simple machine is the concept map about?
The diagram below shows how Plant P reproduces.
(a) Is Plant P a flowering or a non-flowering plant?
(b) Give a reason to support your answer in (a).
(c) State two ways in which Plant P reproduces.
The diagram shows the process of reproduction in a chicken.
(a) What must happen to the egg before it can develop into a chick?
(b) How does the rooster and the hen pass on their characteristics to the chick?
An onion bulb left on the kitchen table was cut into four pieces, A, B, C and D as shown in the diagram below.
(a) Which one of the four pieces can reproduced?
(b) An onion bulb cannot make food. Where do the young plants get their food and water from?
Daniel wanted to find out how to reduce the effort needed to move a load using a wheel and axle.
(a) Which two of the wheel and axles, A, B or C should Daniel use for the experiment?
(b) Fill in the blanks with the words 'greater than', 'less than' or 'the same as'.
(i) Effort needed in Set-up B is ___________________ than A.
(ii) Effort needed in Set-up C is ___________________ than A.
The figures below show two machines, A and B. An effort is applied on each machine to move a load of 100g.
State two similarities about the effort applied in A and B.
The diagram shows a ramp set up to test how the length of the ramp affects the lifting of a load.
(a) Which variables must be kept the same or changed to ensure that the test is a fair one?
Weight of load
Height of ramp
Length of ramp
Type of surface of ramp
(b) What measuring instrument will you use to measure the force needed to lift the load?
The diagram shows a system of pulleys and gears.
(a) If the Driver wheel X rotates in the clockwise direction as indicated, state the direction in which the other gears will rotate.
(i) A: ___________________
(b) What change can be made to the system to increase the speed of the rotation of the other gears A, B and C?
The picture below shows a screwdriver.
(a) Which part of the screwdriver works on the principle of the inclined plane?
(b) A screwdriver can be used as a lever or a wheel and axle. Give a situation in which a screwdriver is used as
Wheel and axle:________________________________________________
(a) Flowering plant.
(b) The adult plant produces seeds, which come from the fruit.
(c)Seeds and Underground Stem
(a) It must be fertilised.
(b) The sperm must fuse with the egg.
(b) Fleshy leaves
(a) A and B
(b) (i) less than; (ii) greater than
Less effort is used to lift the load.
Both machines change the direction of the force.
|Weight of load||
|Height of ramp||
|Length of ramp||
|Type of surface of ramp||
(b) Spring Balance
D: anti -clockwise
(b) Gear X can be swapped for a bigger gear.
(i) Prying open a tin of biscuits
(ii) Drive screws into something
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