BECE 1991 Integrated Science Paper 2

 

BECE PAST QUESTIONS AND ANSWERS

BECE 1991 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) What is the difference between self-pollination and cross-pollination?

        (ii) Name two agents of cross-pollination.


(b) A ray of light strikes the surface of a plane mirror at an oblique angle. Draw a ray diagram to show each of the following:

        (i) the normal

        (ii) the incident ray

        (iii) the reflected ray

        (iv) the angle of incidence

        (v) the angle of reflection

(c) Give one property of the image formed by a plane mirror.

(d) (i) Carbon dioxide is prepared in the laboratory by pouring some dilute hydrochloric acid on calcium carbonate. Give a balanced equation for this reaction.

    (ii) How would you test for carbon dioxide?

    (iii) Give one use of carbon dioxide.


2. (a) Define the following processes:

        (i) Excretion

        (ii) Respiration

        (iii) Name one organ in man which is responsible for each of the processes in 2(a) (i) and (ii) above

    (b) Mention three ways of protecting people from infection during an outbreak of cholera.


(c) Write down the chemical names of the following compounds.

        (i) MgCl2

        (ii) FeS

        (iii) CuSO4

        (iv) NH4OH


(d) List the names of the planets in order of their distances away from the sun; starting with the one nearest to it.


3. (a) (i) What is a solution?

        (ii) Write down balanced chemical equations for the preparation of the following substances.

                 (α) Sodium Chloride: Prepared from a reaction between Sodium hydroxide and dilute hydrochloric acid

                (β) Ammonia: Prepared from a reaction between nitrogen and hydrogen.

 

(b) Classify the following under voluntary and involuntary actions:

        (i) Laughing

        (ii) Blinking of the eyes

        (iii) Sneezing

        (iv) Eating



(c) (i) State four characteristics which are common to all living things.

     (ii) Write down one function of each of the following: 

                (α) Leaves

                (β) Roots

(d) (i) Mention two main defects of the human eye.

    (ii) How are these defects corrected in each case?

 

4. (a) (i) Name the gas which is used in both rusting and burning.

        (ii) State two ways in which rusting can be prevented in everyday life.


(b) Classify each of the following items as element, compound, mixture or colloid:

        (i) Sodium chloride

        (ii) Sugar solution

        (iii) Fog

        (iv) Hydrogen

        (v) Sulphur


(c) (i) Use any three of the following to form a food chain:  Man, bird, green grass, goat, grasshopper

     (ii) Name two diseases that can be controlled by immunization.


(d) (i) A boy throws a stone vertically up into the air. What are the energy changes that take place as the stone falls to the ground?

    (ii) Give two appliances which use electromagnets in their operation

    (iii) List two ways in which a magnet can lose its magnetism.


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