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THE WEST AFRICAN EXAMINATIONS COUNCIL
GHANA

Basic Education Certificate Examination

SCIENCE 2004

THEORY QUESTIONS

PART II
[45 marks]


Answer anythreequestions from this section

  1. (a) (i) List four parts of a plant that are used for asexual reproduction
    (ii) Give two reasons why sexual reproduction is more advantageous than asexual reproduction.
    (b) (i) Explain why atoms are electrically neutral
    (ii) Write the systematic names of the following substances:
    (α) CuO,
    (β) SO2 [5 marks]
    (c) (i) What is dispersion of light?
    (ii) Draw and label a diagram of dispersion of light through a triangular glass prism. [4 marks]

  1. (a) (i) What is soil erosion? (ii) Give two types of soil erosion. (b) Write the name and chemical formula of the compounds formed when the following elements combine: ( i) zinc and oxygen (ii) calcium and chlorine (c) (i) Distinguish between heat and temperature. (ii) Draw and label the mercury-in-glass thermometer. (iii) What mode of heat transfer is involved in the use of a thermometer?

  1. (a)(i)What is a hormone? (ii)Copy and complete the following table.

    Name of Hormone Organ Secreting Hormone Function of Hormone
    Adrenalin Adrenal Glands Increases heart rate and energy availability in response to stress
    Thyroxin Thyroid Gland Regulates metabolism and growth
    Insulin Pancreas Regulates blood sugar levels by facilitating glucose uptake
    (b) Ammonia gas is prepared in the laboratory by heating ammonium chloride and calcium hydroxide.
    (i) Write a balanced equation for the reaction.
    (ii) How is ammonia gas tested in the laboratory?
    (iii) State one use of ammonia.
    (c)(i) Name four types of forces.
    (ii) A boy used a catapult to kill a bird which was on a tree and it fell to the ground. Give two forces involved in this process [3 marks]

  1. 5. (a) (i) Distinguish between a rhizome and a stem tuber
    (ii) Give one example each of a rhizome and a stem tuber [5 marks]
    (b) State the method which could be used to separate each of the following mixtures and explain your answer in each case:
    (i) salt and water,
    (ii) sawdust andiron filings,
    (iii) powdered charcoal and water [6 marks]
    (c) (i) Define density of a substance
    (ii) Explain how a body which sinks in water could be made to float. [4 marks]

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