BECE 1995 Integrated Science Paper 2

    

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BECE 1995 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) Explain each of the following terms:

(i) Diffusion

(ii) Surface tension

(iii) Capillarity



(b) Why does water wet glass?


(c) (i) State the composition of blood

    (ii) List three functions of blood



(d) (i) Describe how ions are formed from atoms

        (ii) State two differences between a proton and an electron.

        (iii) Write the chemical symbol for each of the following: (α) an atom of Lithium

                (β) a molecule of chlorine

                (γ) an atom of oxygen


2. (a) Make a labelled diagram of the human eye.

(b) (i) Name two defects of the eye.

(ii) State how each of the defects you have named above can be corrected.

(c) (i) What is a satellite?

(ii) State one difference between a natural and an artificial satellite.

(iii) State two uses of artificial satellites.


(d) Write down the names of the new substances formed when each of the following substances react with dilute hydrochloric acid.

    (i) Ammonia

    (ii) Sodium hydroxide

    (iii) Calcium carbonate


3. (a) In each of the activities listed below state whether the changes that occur are physical or chemical. Explain your answers.

        (i) An egg is boiled for five minutes

        (ii) A piece of bread is chewed in the mouth for two minutes

        (iii) A piece of meat is chewed in the mouth for two minutes

        (iv) A piece of wood is burnt to ashes
    


(b) Define each of the following
        (i) A machine

        (ii) Mechanical advantage of a machine

        (iii) Velocity ratio of a machine

(c) A system of levers is used to overcome a resistance of 3,000 N when an effort of 150 N is applied to it. Calculate the mechanical advantage of the system.

(d) (i) List three general causes of diseases

     (ii) State four ways by which diseases can be prevented.


4. (a) Distinguish between sexual reproduction and asexual reproduction.

 (b) State the vegetative part that can be used to propagate each of the following plants:

        (i) cassava

        (ii) onion

        (iii) banana

        (iv) yam

        (v) ginger

        (vi) pineapple

(c) (i) Define density of a substance.

      (ii) Describe how you would determine the density of a sample of soil in the laboratory.

(d) State one solvent for each of the following substances

        (i) Common salt

        (ii) Paint

        (iii) Coal tar

        (iv) Sucrose

        (v) Chlorophyll

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