BECE 2023 Integrated Science Paper 2

 

BECE 2023 

Integrated Science Paper 2

Essay

[100 marks]

The paper is in two sections: A and B. Answer Question 1 in section A and any other four questions in section B.

Answer all the questions in your answer booklet.

Credit will be given for clarity of expression and orderly presentation of material.

SECTION A

[40 marks]

Answer all of Question 1.

(a) The diagram below are illustrations of a set-up used to study the conditions for seed germination. The flasks were kept at 25° during the experiment. Study the diagrams carefully and answer the questions that follow.

   
(i) What conclusions can be drawn from the results of flask 1 and flask 2? 

(ii) What conclusion can be drawn from the results of flask and flask 3?

(iii) The seedlings in flask 2 died after 2 weeks. What can be the reasons for this occurrence?

(iv) A candidate concluded that light was an important factor for the germination. Did the candidate make the correct conclusion?

(v) 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.

(b) The diagrams below are illustrations of an experimental setup. Study the diagrams carefully and answer the questions that follow.

(i) Name the measuring instrument that is in: 

        (a) parallel: [1 mark] 

        (b) series with the resistor R. [1 mark]

(ii) What quantity does each of the named instruments in (i) measure? [2 marks]

(iii) Read and record the values as indicated on: 

        (a) A in amperes. [2 marks] 

        (b) V in volts. [2 marks]

(iv) Use the values read in (iii) to calculate the value of R. [3 marks]

(v) State one precaution to be taken in performing this experiment. [1 mark]

(c.) The diagrams below are illustrations of different types of soil. Study the illustrations carefully and answer the questions that follow.

(i) Identify each of the soil types labeled A, B, and C. [3 marks]

(ii) Describe each of the soils under the following properties: 

        (a) particle size; [2 marks] 

        (b) air space; [2 marks]

(iii) Suggest two ways of improving soil type B for vegetable cultivation. [4 marks]

(d). The diagrams below are a set-up for preparation of common salt in the laboratory. Study the diagram carefully and answer the questions that follow.

(i) Name each of the parts labelled IV, V, and VI. [3 marks] 

(ii) Name two possible solutions that can react to produce salt. [2 marks]

(iii) Name the process that takes place when the two solutions named in (ii) react. [1 mark] 

(iv) Name the process that takes place in the set-up B. [1 mark] 

(v) Write a balanced chemical equation for the reaction between the two solutions named in (ii). [2 marks]

SECTION B

(50 marks)

Answer four questions only from this section.

2. (a) State what happens when photosynthesis occurs in a leaf. What is photolysis? [3 marks]

(b) Explain briefly why the mass of lumpy charcoal remains unchanged when ground to powder but the mass of the same lump changes when heated to burn.

(c.) (i) What is a physical quantity?

     (ii)  State two physical quantities. [4 marks]

(d) State two importance each of: 

            (i) light; 

            (ii) temperature; 

            (iii) reproduction. [4 marks]

3. (a) (i) What is hardness of water? 

               (ii) Give one example each of a natural source of water that is: 

                            (α) hard water; 

                           (β) soft water. [4 marks]

       b.) What is the end product of digestion of each of the following food substances?

                (i) Meat; 

                (ii) Cassava;

                (ii) Palm-oil

    (c.) Give one effect of each of the following factors considered in vegetable crop production.

            (i) soil type;

            (ii) nearness to market;

            (iii) nearness to source of water.

    (d) (i) Explain briefly why an eclipse occurs.

            (ii) Name the two types of eclipse.

4. (a) (i) Explain the term convection as applied to heat transfer.

            (i) Give two reasons why convection does not occur in solids.

   (b) Give two effects of each of the following soil physical properties on maize cultivation

            (i) texture;

            (ii) water holding capacity.

(c.) Use any three of the following organisms to construct a food chain:

            Hawk, grasshopper, man, grass, toad, grasscutter.

(d) (i) Consider the following elements and state which element(s) is/are metals:

                        ₁₁Na, ₇N, ₆C, ₃Li 

        (ii) Explain briefly what is observed when pieces of each of the following metals are dropped into two separate test tubes each containing dilute hydrochloric acid:

                 (α) magnesium 

                  (β) silver

5. (a) State two important components each of the soil that helps:

            (i) crops to grow well;

            (ii) to maintain good soil structure.

(b) (i) Explain how energy in a windmill is obtained.

        (ii) State one source of renewable energy.

(c.) (i) Explain why steel is preferred to iron in building construction.

      (ii) State two ways of preventing rusting.

(d.) State three ways of preventing indigestion.

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