BECE 1996 Integrated Science Paper 2

    

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BECE 1996 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) Define the following terms:

        (i) erosion

        (ii) reproduction

        (iii) parasite

        (iv) excretion


(b) Give one example each of erosion and parasite.


(c) Draw and label a diagram of the female reproductive organ in a human being.


(d) (i) Define the term work.

(ii) An amount of 300.0 J of work is done when a force moves through a distance of 10.0 m in the direction of the force. Calculate the value of the force.

(e) Write down the names of the following compounds:

    (i) NH4Cl

    (ii) HCl

    (iii) CuSO4

    (iv) FeCl3

(f) Explain how sulphur can be obtained from a mixture of powdered sulphur and iron filings.


2. (a) Draw and label a diagram to show how the eclipse of the sun is formed.

    (b) (i) What is a lever?

        (ii) Classify the following as first class lever, second class lever or third class lever by copying and completing the table below:

Beam balance, crowbar, wheel barrow, a pair of scissors, claw hammer, sugar tong, human fore-arm and bottle opener. 

First class lever	Second class lever	Third class lever

 
(c) (i) What is pollination?

    (ii) Give two agents of pollination.

(d) Name three excretory organs and the products they excrete.

(e) (i) What is an alloy?

    (ii) What are the compositions of each of the following alloys? Bronze, Brass, Steel and Duralumin.


(f) Sodium chloride is prepared by the reaction between dilute hydrochloric acid and sodium hydroxide solution. Write down the equation for this reaction.


3. (a) An atom has an atomic number of 8 and a mass number of 16. State the number of each of the following in the atom:

(i) Protons

(ii) Electrons

(iii) Neutrons


(b) (i) Draw the structure of the atom in (a) above

    (ii) If the atom in (a) above gains two electrons what will be the charge of the ion?


(c) State the end-product of the following food substances:

    (i) Carbohydrates

    (ii) Proteins

    (iii) Fats


(d) (i) What is the preservation of food.

    (ii) List four methods of food preservation.

Explain why one of the methods you have listed is used for food preservation.

 

(e) (i) An object is placed in front of a plane mirror. Draw a ray diagram to show how the image of the object is formed.

(ii) State two characteristics of an image formed by a plane mirror.



4. (a) (i) Give the names of organisms which cause the following diseases:

Sleeping sickness, Cholera, Malaria, Bilharzia


        (ii) Which part of the following crops does a farmer usually grow?

            Banana, cocoyam, tomato, ginger, yam, cassava


(b) Name the organs used by the following organisms for respiration:

(i) Tilapia

(ii) Toad


(c) (i) What happens to the temperature of water that is boiling in an open container?

     (ii) Give two characteristics of a liquid.

     (iii) Name the three processes by which heat is transmitted.

     (iv) State two applications of the expansion of solids in everyday life.


(d) Explain the following terms:

    (i) Physical change

    (ii) Chemical change


(e) State whether each of the following is a physical or a chemical change

    (i) rusting of iron

    (ii) freezing of water

    (iii) burning of wood

    (iv) fermentation

    (v) grinding of chalk

    (vi) dissolving sugar in water

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