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REVISION EXERCISE FORM 2
1. Diagram 1 shows the structures of the human skin.
DIAGRAM 1
(a) On Diagram 1, label the structures R, P and S.[3 marks]
(b) Name the system in Diagram 1.
______________________________________________________________________ _
[1 mark](c) State two functions of the organ in Diagram 1.
i) ________________________________________________________________
ii) ________________________________________________________________ [2 marks]
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2. Diagram 2.1 and Diagram 2.2 shows the visions of an animal and a human.
___________________ __________________ DIAGRAM 2.1 DIAGRAM 2.2
(a) In the spaces provided on Diagram 2.1 and Diagram 2.2 name the type of visions.
[2 marks](b) State the advantage of the vision in Diagram 2.1.
______________________________________________________________ [1 mark]
( c) State 2 characteristics of the vision in Diagram 2.2.
____________________________________________________________________
____________________________________________________________________ [2 marks]
(d) List two examples of animals with the vision of Diagram 2.1
____________________________________________________________________ [2 marks]
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3. Diagram 3 shows a human digestive system.
DIAGRAM 3
(a) Name the parts labelled P, Q, R, S, T, U and V.[2 marks]
(b) What is produced by part U?
_____________________________________________________________ [1 mark]
( c) Which part does digestion ends?
____________________________________________________________________ _
[1 mark]
(d) State the enzymes excreted in Q
i) _________________________________________________________________
ii) _________________________________________________________________
iii) _________________________________________________________________ [3 marks]
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4. Diagram 4 shows an experiment on the electrolysis of water.
DIAGRAM 4
(a) Name two elements of water [2 marks]
(b) Define electrolysis. [2 marks]
( c) Based on the above diagram,
(i) what is gas Y? [1 mark]
(ii) What will happen when gas X is tested with a burning wooden splinter? [1 mark]
(iii) What is the ratio of volume of gas X and Y collected at cathode and anode? [1 mark]
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5.
DIAGRAM 5
The above diagram shows a graph of solubility of solutes P, Q and R against temperature.
(a) What is solubility? [2marks]
(b) Based on the above graph,
(i) what happens at point S? [1 mark]
(ii) which solute has the lowest solubility at 15 oC? [1 mark]
(iii) which solute has the highest solubility at 75 oC? [1 mark]
(c) Give two factors beside temperature that affect the rate of dissolving a solute in a solvent?
(i)__________________________________________________________________________
(ii)
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[2 marks]
6.(a)
DIAGRAM 6
The above diagram shows some water is boiled in a metal tin. The tin is then sealedimmediately and placed under cold running water.
(i) What will happen to the metal tin? [1 mark]
(ii) Explain your answer in (a). [1 marks]
(iii) Give two applications of air pressure in our daily life. [2 marks]
(b)
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(i) Based on the above diagram, what will happen to the balloon when air is pumped outof the bottle? [1 mark]
(ii) Explain your answer in (a). [2 marks]
(iii) Beside temperature, what will affect the air pressure in a covered container? [2marks]
( c) Gases are usually stored in the form of liquid in cylinders and aerosol cans.
Give two examples of gases stored in gas cylinders. [2 marks]
7.(a) (i) Define work done. [1 mark]
(ii) A machine produces 15000 J of work in 30 seconds. Calculate the power produced by
the machine. [3 marks]
(b) A worker carries a box with a mass of 20 kg. He climbs up a flight of stairs of 30 steps in10 seconds. Each step is 25 cm high.
(i) Calculate the work done. [3 marks]
(ii) Calculate the power produced by the worker. [3 marks]
( c) (i) Define power. [1 mark]
(ii) A man with a mass of 50 kg pushes a car with a mass of 1500 kg against the wallfor 10 seconds. Calculate the work done. [1 mark]
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8.
(a) Study the animal in the below figure.
(i) Explain how this animal supports its body weight. [1 mark]
(ii) Land vertebrates like deer have hollow bones. Why? [1 mark]
(b) (i) State one similarity between land vertebrates and aquatic vertebrates.[1 mark]
(ii) How is the body weight of aquatic vertebrates being supported? [1 mark]
(iii) What will happen if a whale is washed ashore? Explain. [2 marks]
( c) Study the cross-section of the stem of a plant in the below figure.
(i) (i) Where does this plant grow? [1 mark]
(ii) Explain your answer in (a)(i). [1 mark]
(ii) What happen if the part labelled with X is removed? [1 mark]
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(iii) State two plants that have the same stem structure. [2 marks]
9.(a). (i) State what a lever consists of. [1 mark]
(ii) List all classes of lever and give an example for each of them. [3 mark]
(iii)
State the class of lever the above object belongs to. [1 mark]
(b) (i) Define moment of force. [2 marks]
(ii) State two factors that affect the moment of force. [2 marks]
(c)
The two children in the above diagram sit at an equal distance from the fulcrum.
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(i) State the class of lever of the above object. [1 mark]
(ii) Calculate the distance that the girl has to sit to make the seesaw balanced. 3 marks]
10. Diagram 10 shows an experiment to test the presence of starch in green leaf.[Pot of plant which has been kept in the day after few hours is tested for presence of starch.]
DIAGRAM 10
A
B
CD E
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(a) Based on your observation, what inference can be made.
- ______________________________________________________________________ [1 mark]
(b) State the variables involved in this experiment.
Constant variableManipulated variableResponding variable
[3 marks]
( c) State the purpose of each stages
Stage A Boil the leaf in water to ____________________________________ Stage B Boil the leaf in alcohol to __________________________________ Stage C Soak the leaf in hot water to ________________________________ Stage D Put a drop of iodine to _____________________________________
Stage E _______________________________________________________ [5 marks]
(d) Define photosynthesis.
_______________________________________________________________________
_______________________________________________________________________
__
[ 2 marks]
(e) Write the equation for photosynthesis.
[1 mark]
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11. Diagram 11 shows 8 animals, based on your observation, state one characteristic of
each animal
PQR STUVW
[8 marks]
(B) Classify them into 2 group based on their common characteristics
P R
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[4 marks]
P,Q,R,S,T,U,V,W
Common characteristics
Nameof animals