BECEzone

THE WEST AFRICAN EXAMINATIONS COUNCIL
GHANA

Basic Education Certificate Examination

SCIENCE 2005

THEORY QUESTIONS

ESSAY

This paper is in two sections, A and B
Answer Question 1 in Section A and any other three questions in Section B.
Credit will be given for clarity of expression and orderly presentation of material


PART I
[40 marks]


Answer all of Question 1

    1. a diagram of magnetization

      In an experiment, a pupil took two empty Milo tins and made holes in their sides as shown in the diagram above.The pupil then filled the Milo tins with water.

      1. Draw and label the diagrams to show what the pupil will observe in set-up A and set-up B

      2. Explain the observations in set-up A and set-up B

      3. What is the aim of set-up A?

      4. What is the aim of set-up B?

    2. In an experiment, equal volumes of dilute hydrochloric acid (solution A) and dilute sodium hydroxide (solution B) are mixed together to form solution C.

      1. What is the volume of solution C?

      2. Red litmus paper and blue litmus paper are dipped in turns into solutions A, B, and C. State the observations you will make in all six cases.

      3. Give the name of the reaction that took place between solution A and solution B.

      4. Identify solution C.

      5. State what will happen when solution C is heated.

    3. The table below gives the steps that were followed in an experiment to test for starch in a green leaf freshly taken from a tree.

      Stages in the Test for Starch
      I. Leaf is put into boiling water for 1 minute
      II. Leaf is dipped in alcohol warmed in a hot water bath
      III. Leaf is washed in cold water
      IV. Leaf is dipped into iodine solution

      1. State the reason for carrying out each of the activities in stages I, II, and III.

      2. What happens when the leaf is dipped in iodine solution?

      3. Give the colour changes of the leaf from the beginning of the experiment to the end of the experiment.

      4. Why is the alcohol warmed indirectly in a water bath?

      5. Explain what will be observed if the test is carried out on a leaf taken from a plant kept in a dark room for 1 day.

BackSECTION B