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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