BECEzone

THE WEST AFRICAN EXAMINATIONS COUNCIL
GHANA

Basic Education Certificate Examination

SCIENCE 2021

THEORY QUESTIONS

ESSAY

This paper is in two parts: I and II. Answer Question 1 in part I and any other four question in part II


PART I
[40 marks]


Answer all of Question 1

    1. The diagrams below are illustrations of a set-up used to study the conditions for seed germination. The flasks are kept at 25 oC during the experiment.

      Study the diagrams carefully and answer the questions that follow.

      1. What conclusion can be drawn from the results of flask 1 and flask 2?

      2. What conclusion can be drawn from the results of flask 2 and flask 3?

      3. The seedings in flask 2 died after two weeks. What can be the reasons for this occurrence?

      4. A candidate concluded that light was an important factor for the germination. Did the candidate make a correct conclusion?

      5. Give a reason for the answer stated in (iv) and state which of the flasks in the experiment could be used to support your answer.

    2. The diagram below are illustrations of an experimental set-up. Study the diagrams carefully and answer the questions that follow.

      1. Name the measuring instrument that is in:

        α) parallel;

        β) series;

        With the resistor R

      2. What quantity does each of the named instruments in (i) measure?

      3. Read and record the values as indicated on:

        α) A in amperes;

        β) V in volts.

      4. Use the values read in (iii) to calculate the value of R.

      5. State one precaution to be taken in performing this experiment.

    3. The diagrams below are illustrations of soil

      Study the illustrations carefully and answer the questions that follow.

      1. Identify each of the soil types labelled A, B, and C.

      2. Describe each of the soils under the following properties:

        (α) Particle size

        (β) Air space

      3. State two ways of improving soil type B for vegetable cultivation.

    4. The diagrams below is a set-up for preparation of common salt in the laboratory.

      Study the diagrams carefully and answer the questions that follow.

      1. Name each of the parts labelled IV, V and VI.

      2. Name two possible solutions that can react to produce salt.

      3. Name the process that takes place when the two solutions named in (ii) react.

      4. Name the process that takes place in the set-up B.

      5. Write a balanced chemical equation for the reaction between the two solutions named in (ii).

BackSECTION B