BECEzone

THE WEST AFRICAN EXAMINATIONS COUNCIL
GHANA

Basic Education Certificate Examination

SCIENCE 2012

THEORY QUESTIONS

PART II
[60 marks]


Answer all of Question 1

      1. What is technology?

      2. State one use of technology in communication.

    2. Write and balance each of the following chemical equations:

      1. Fe + O2 → Fe2O3;

      2. Na + Cl2 → NaCl;

      3. H2 + O2 → H2O.

    3. State one function of each of the following components of a typical cell:

      1. nucleus;

      2. chloroplast;

      3. mitochondrion.

    4. Mention four cultural practices in vegetable crop production.

    5. Name two agencies in food safety and quality assurance in Ghana.

    1. Explain why a tomato plant is likely to wilt if too much fertilizer is applied to it.

      1. Give two differences between electrical insulators and electrical conductors.

      2. State two effects of illegal electrical connections in the home.

    3. Explain each of the following terms as used to describe change of state of matter:

      1. condensation;

      2. freezing.

      1. State two diseases of the circulatory system in humans.

      2. Mention two ways in which each of the diseases you have stated in (d)(i) can be prevented.

      1. What is a transistor?

      2. Give two uses of a transistor.

    2. Mention the suitable solvent for each of the following solutes:

      1. grease;

      2. ink stain;

      3. starch;

      4. cube sugar;

      5. oil paint;

      6. iodine.

      1. What is a respiratory organ?

      2. Name two structures of the respiratory system of humans.

      1. What is an agricultural chain?

      2. Name two types of agricultural chain.

      1. What are stars?

      2. Arrange in order, starting from the sun, the first four planets in the solar system.

    2. State

      1. two differences between plants and animals;

      2. two similarities between plants and animals.

    3. Explain each of the following farming systems:

      1. pastoral farming;

      2. ecological farming.

    4. State the properties of water in terms of

      1. odour,

      2. taste,

      3. effect on litmus.

    1. What are

      1. annual plants?

      2. perennial plants?

    2. Mention one danger involved in each of the following activities in the laboratory:

      1. eating or drinking water in the laboratory;

      2. washing hands with unknown liquid in a beaker;

      3. walking barefooted.

      1. What is a digestive enzyme?

      2. Give two examples of digestive enzymes in humans.

    4. Give two differences between conduction and radiation of heat.

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