BECE 2003 Integrated Science Paper 2

    

BECE PAST QUESTIONS AND ANSWERS

BECE 2003 INTEGRATED SCIENCE

ESSAY - Paper 2

Answer three questions only from this section.

Illustrate your answers wherever possible, with large, clear and fully labelled diagrams. Credit will be given for clarity of expression and orderly presentation of material.

All questions carry equal marks

1. (a) (i) Define photosynthesis

(ii) Give two ways in which photosynthesis is important to animals

                                                                                [5 marks]

(b) Name three sources of chemical energy
                                                                            [3 marks]

(c) Describe how you would separate a mixture of sodium chloride and sand

                                                                                                        [4 marks]

(d) Complete and balance the following chemical reaction:

CaCO3 + HCl →

                                                                                                          [4 marks]

(e) Two dry cells, a switch and a bulb are connected in series. Draw and label a circuit diagram of the arrangement

                                                                                                        [4 marks]



2. (a) State two precautions that should be taken to prevent the spread of each of the following diseases:

            (i) cholera

            (ii) smallpox
                                                                                                          [4 marks]


(b) Describe how you would test for starch in a leaf.
                                                                                                           [6 marks]

(c) Draw and label the structure of an atom containing three electrons. Indicate the charges of the particles.
                                                                              [6 marks]



(d) (i) Explain why an inclined plane is classified as a machine

(ii) Give two reasons why the output energy of a machine is always less than the input energy.
                                                                          [4 marks]

3. (a) Name the two processes that lead to the formation of seeds in a flowering plant
                                                                                                                     [2 marks]

  (b) (i) Give five components of blood

      (ii) State three functions of blood
                                                                    [8 marks]


(c) (i) What is an electrical insulator?

    (ii) Mention three examples of insulators

    (iii) Give two characteristics of an insulator that explain its behaviour
                                                                                          [7 marks]

(d) Classify the following substances under the three states of matter: petrol, palm oil, soap, carbon dioxide, corn flour, smoke
                                                                                 [3 marks]


4. (a) (i) What is a deficiency disease?

           (ii) Give two deficiency diseases and their causes.
                                                                                                      [6 marks]

  (b) (i) State the importance of excretion in living organisms.

      (ii) Name two excretory organs of the human body and the substances they excrete.
                                                                                                    [6 marks]

  (c) (i) Explain why gases are more compressible than solids.

       (ii) Give two areas where the compressible nature of a gas is applied
                                                                                            [4 marks]


(d) A piece of stone is dropped from a height to the ground.

State the energies possessed by the stone

(i) just before it was released from the maximum point;

(ii) midway between the fall;

(iii) just before it hit the ground. 

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