BECE 1994 Integrated Science Paper 2
BECE PAST QUESTIONS AND ANSWERS
BECE 1994 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) Distinguish between the following terms:
(i) Physical change and chemical change
(ii) Solution and suspension
(b) Classify the following as either a physical or chemical change
(i) Common salt in water
(ii) Burning of charcoal
(iii) Melting of ice
(iv) Hydrochloric acid in sodium hydroxide solution
(c) (i) What is a parasite?
(ii) Give two examples of parasites and their hosts.
(d) Give the chemical symbols of the following elements
(i) Oxygen
(ii) Chlorine
(iii) Aluminium
(iv) Calcium
(e) (i) Explain the term self-pollination
(ii) Name four agents of pollination
(iii) State the function of the brightly coloured petals in insect pollination
2. (a) (i) Explain the term digestion
(ii) State the end products of digestion of each of the following food substances
(α) carbohydrates;
(β) proteins;
(γ) fats and oils
(iii) Name the enzyme present in saliva and state its function
(b) (i) By what process does the heat of the sun reach the earth?
(ii) An aluminium bowl placed on a table is filled with hot water. Name the processes by which heat is lost by the bowl.
(iii) Give one reason why wood is used as a handle for some cooking utensils.
(c) List separately the vegetative parts and reproductive parts of a flowering plant
(d) (i) What are alloys?
(ii) Give two examples of alloys and state their constituents
3. (a) (i) Explain the term friction
(ii) Give two methods of reducing friction
(iii) A rigid bar is used to lift a stone
(α) Draw a diagram showing the effort, pivot and load positions
(β) If the length of the bar is 100 cm and the pivot is placed 80 cm from the effort, calculate the load distance
(b) (i) Explain the term excretion
(ii) State the organs in human beings which excrete the following waste products: (α) Sweat
(β) Carbon dioxide (γ) Urine
(c) (i) What is a food chain?
(ii) Draw a food chain using the following organisms:
Hawk, cassava leaf, lizard and grasshopper
(d) State three conditions necessary for the germination of seed.
(e) (i) Name two diseases which can be transmitted sexually
(ii) Give two features which can be passed on from parents to children
4. (a) (i) List the various planets of the solar system in the order they occur starting with the planet nearest the sun
(ii) State one difference between the eclipse of the sun and the eclipse of the moon.
(b) (i) Define the term force
(ii) State three types of force
(iii) A box is pulled by a force of 20 N through a distance of 8m along a smooth floor. Calculate the work done by the force.
(c) Draw simple electrical circuits showing the following arrangements:
(i) A switch and a light bulb in series with two dry cells in series
(ii) A switch and a light bulb in series with two dry cells in parallel
(d) Name two diseases that can be controlled by immunization
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