BECE 1998 Integrated Science Paper 2

    

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BECE 1998 INTEGRATED SCIENCE

Essay - Paper 2

 Answer three questions only from this section.

Illustrate your answers wherever possible, with large, clear and fully labelled diagrams. Credit will be given for clarity of expression and orderly presentation of material.

All questions carry equal marks

 

 1. (a) State two differences between a planet and a star. 

 

     (b) (i) What is surface tension.

(ii) State one way in which surface tension can be useful to man. 

 

    (c) (i) Give one example each of a rhizome, a corm, a stem tuber, a bulb and a sucker.

(ii) State two reasons why a rhizome, a corm and a stem tuber are considered as stems. 

 

    (d) Name the compounds formed when the following elements combine:

(i) zinc and oxygen

(ii) calcium and chlorine

(iii) sodium and bromine

(iv) potassium and iodine

 

2. (a) (i) What is a fertile soil?

        (ii) Name four of the most important nutrients in mineral salts which plants use to form food.


(b) (i) Define density of a substance.

       (ii) Describe briefly how you would determine the density of an irregular piece of stone.

        (iii) A box with volume 1200.0 m3 is filled with sand to the brim. If the density of the sand is

1.95 kgm-3, calculate the mass of the sand contained in the box. 

 (c) (i) Define an atom.

     (ii) Why are atoms electrically neutral?

 

3. (a) Explain the following

        (i) Crackling noises are heard from a metal sheet when the weather becomes very hot.

        (ii) Railway tracks are laid with gaps in between their ends.

        (iii) A fitting mechanic washes his greasy hands with petrol and not with water.

 

(b) What observation will be made if a piece of blue litmus paper is dropped in each of the following:

        (i) sodium hydroxide solution

        (ii) dilute hydrochloric acid

        (iii) lime juice

        (iv) distilled water

        (v) rain water

 
(c) State any three ways in which constipation could be avoided.

 

(d) What are the end products of the digestion of each of the following food substances?

    (i) Carbohydrates

    (ii) Proteins

    (iii) fats

 

4. (a) State four ways by which plants are able to protect themselves against animals.

    (b) (i) Define pollination.

        (ii) List four features of insect pollinated flowers.

   (c) An atom has three protons and three neutrons.

        (i) How many electrons are there in this atom?

        (ii) Draw a labeled diagram to show the arrangement of all the particles in the atom.


(d) A body of mass 12.0 kg is placed on an orange tree 20.0 m above the ground

        (i) Calculate its potential energy with respect to the ground

        (ii) If the body is released from this height, what will be its kinetic energy just before it hits the ground.

                                        [g = 10 ms-2]

 

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