BECE 2017 Integrated Science Past Question Paper Two


(a) The diagram below is an illustration of a longitudinal section of a canine tooth in humans.
Study the diagram carefully and answer the questions that follow.


(i) Name each of the parts labelled I, II, III, IV and V.
(ii) What is the function of each of the parts labelled I and III?
(iii) Which of the labelled parts could be affected by tooth decay?
(iv) State three ways by which tooth decay may be prevented.

(b) The diagram below is an illustration of a scientific phenomenon which occurs in nature.
Study the diagram carefully and answer the questions that follow.


(i) What phenomenon does the diagram illustrate?
(ii) Identify each of the parts labelled I, II, III, IV and V.
(iii) Explain why an object at the bottom of a pond appears closer to the surface than it actually is.

(c) The diagram below is an illustration of an experiment performed to separate the components of muddy water.

Study the diagram carefully and answer the questions that follow.


(i) Name each of the parts labelled I, II and III.
(ii) State the function of the part labelled II.
(iii) Name the substance obtained as the filtrate.
(iv) State three physical properties of the filtrate.
(v) Name two other materials that could be used in place
of the part labelled II.

(d) The diagram below illustrates a farmland on a sloppy area.

Study the diagram carefully and answer the questions that follow.


(i) What process is likely to occur on the farmland when it rains heavily?
(ii) State two farming practices that can also lead to the process mentioned in (i).
(iii) List four farming practices that could be used to control the process mentioned in (i).
(iv) Mention three soil resources that would be depleted from the farmland when it rains heavily.

I – Crown / Enamel
II – Dentine
III – Cement / Periodontal membrane
IV – Jaw bone / Root
V – Pulp Cavity

I – Protects teeth from harmful bacteria
– Enable teeth withstand pressure of chewing
– Cutting / chewing / protects dentine / protect pulp cavity
III – hold tooth firmly (in socket / Jaw bone)

(iii) V – Pulp cavity

(iv)  avoid using sharp-pointed objects
 avoid having dry mouth
 use water containing fluorides to wash teeth / mouth
 avoid smoking
 the teeth should be cleaned regularly after each meal / remove food particle from the teeth / flossing
 wash the mouth vigorously after each meal
 regular visit to the dentist
 avoid eating too hot foods
 avoid eating too much sugary food
 avoid eating too cold food / taking too cold drinks


(i) Refraction of light

(ii) I – Normal
II – Incident ray
III – angle of incidence / incident angle
IV – angle of refraction
V – refracted ray

(iii) Rays from the object at the bottom are bent away from the normal as they come out of the water. In a straight line, these rays appear to come from a point above the bottom


(i) I – Retort / clamp stand
II – filter paper
III – funnel

 to prevent the residue / solid / insoluble particles / mud from entering the filtrate
 to filter (solid / insoluble particles / residue)
 to separate the nud, solid / insoluble particles from the water

(iii) Water

(iv)  it has a density of 1 gcm –3 / 1000 kgm–3
 it boils at 100°C
 it freezes at 0°C (at 1 atm)
 it is colourless
 it is tasteless / insipid
 it is odourless
 it has a high surface tension, etc

 foam
 cotton wool
 glass wool
 Clean / white cloth


(i) Erosion

 Deforestation
 bush burning
 continuous cropping
 cultivation / ploughing along slope
 crop removal
 excessive use of chemical / inorganic fertilizers
 overgrazing

 planting cover crops
 terracing
 cultivating / ploughing across slope / contour
 heavy mulching
 constructing drainage channels
 planting trees beside farm
 strip cropping
 contour binding

 soil organisms
 nutrients (macro / micro) / mineral matter
 soil particles / mineral matter
 growing crops
 air
 organic matter / humus


 (a) An atom Y has atomic number 12. It loses two electrons in order to be stable.
(i) State the proton number of the atom before it loses electrons.
(ii) State the electron number of the atom:
(α) before it loses electrons.
(β) after losing electrons.

(iii) Name the type of ion formed by the atom when it loses two electrons.

(b) Name four farming systems used in crop production.

(c) (i) What is dispersal of seeds?
(ii) State two characteristics of seeds dispersed by wind.

(d) Explain the term forward bias of a p-n junction diode.

(a) (i) 12
(ii) (α) before it loses electrons – 12
(β) after losing electrons – 10

(iii) Cation / positively charged ion

 Land rotation
 Crop rotation
 Mixed cropping
 Mixed farming
 Organic farming
 Monoculture
 Mono cropping
 Shifting cultivation
 Ecological farming / Eco-farming

(c) (i) It is a process by which seeds are carried away from the parent plant

 seeds are very small
 they are very light
 they have hair
 they have wing-like structures / parachutes

(d) It is when the positive terminal of an electric source is connected to the p-type of the diode and the negative terminal of the source is connected to the n-type of the diode, resulting in the flow of charges / current.


(a) (i) What is an acid?
(ii) Give two differences between an acid and a base, in terms
of taste and feel.

(b) (i) Define pressure.
(ii) A force of 200 N is exerted on an area of 50 m2.
Calculate the pressure exerted by the force.

(c) Explain the following terms as associated with living organisms:
(i) unicellular;
(ii) multicellular.

(d) Give two reasons why soil air is important.

(a) (i) It is a proton donor
A substance or compound that produces excess hydrogen ion (H+) in water
A substance that contains replaceable hydrogen









Non slippery / stinging

Slippery / soapy

(b) (i) It is the force acting (normally) per unit area
Pressure = F/A .
where F = Force
A = Area

(ii) Pressure = F/A
= 200 / 50
= 4 Pa OR 4 Nm–2

(c) (i) Unicellular –
(Very small) living organisms that consist of only one cell.

(ii) Multicellular –
(Large) living organisms that consist of (many) cells

(d) It enhances the absorption of mineral salts / nutrients by plant roots
 It enhances the absorption of water by plant roots
 It makes oxygen available for seed germination
 Presence of aeration prevents the formation of toxic / acidic substances in the soil by micro organisms.
 Plant roots use soil air for respiration / metabolism / growth
 Soil micro organisms use soil air for respiration
 Air is required for the decomposition of organic matter.
 Aeration is required to prevent development of plant diseases


 (a) (i) Explain the following terms as applied to machines:
(α) work input;
(β) work output.

(ii) State one factor that limits work output for a given work input in a simple machine.

(b) (i) What is chloroplast?
(ii) Differentiate between aerobic respiration and anaerobic respiration.

(c) (i) State the colour change that would occur when blue litmus paper is dipped into a solution of:
(α) vinegar;
(β) wood ash.

(ii) Name the products formed when hydrochloric acid reacts with sodium hydroxide.

(d) List two benefits of vegetables to humans.

(a) (i) (α) work input – It is total energy / work applied to a machine for it to be able to work

(β) work output – It is the total energy / work obtained by using machines to do work


 friction / wear and tear
 age of machine / period of usage
 weight of machine parts

(b) (i) It is an organelle / structure found only in (plant) cell and it contains chlorophyll / green pigment.


Aerobic Respiration

Anaerobic Respiration

Requires oxygen

Does not require oxygen

Produces large amount of energy

Produces small amount of energy

Water is produced

Ethanol / lactic acid is produced

(c) (i) (α) vinegar; – changes to red
(β) wood ash. – there is no colour change / remains the same

(ii) Sodium chloride and water

 Prevents constipation
 supply roughage for easy digestion of food.
 to garnish / decorate food
 provide humans with vitamins / proteins / mineral salts / carbohydrates / food nutrients / food
 source of medicine


(a) (i) Differentiate between egestion and digestion in nutrition.
(ii) What is the end-product of digestion?

(b) Give one example of a chemical compound used in:
(i) medicine;
(ii) agriculture
(iii) industry

(c) (i) Define the term soil profile.
(ii) State two ways in which soil profile is important in crop production.

(d) (i) State two steps used by scientists in doing their work.
(ii) Give two subjects that may be considered as applied sciences.

a (i) Egestion is the removal of undigested food / semi-solid / waste / faeces from the anus while digestion is the breaking down of food into smaller building blocks / components that can be absorbed into the blood stream.

(ii)  glucose / simple sugar
 amino acids
 fatty acids and glycerol

(b) (i) medicine;
Drugs / other pharmaceutical products, etc

(ii) agriculture;
Insecticides, pesticides, fertilizers, etc

(iii) industry.
Hydrochloric acid, sodium chloride, ethanol, ammonia, nitric aced, etc

(c)(i) It is the vertical section of the land showing the various horizons / layers and their composition

 helps to know the type of tools to choose
 helps to select good soil for the crop
 to determine depth at which tillage implements must be set
 to know soil management practices to adopt
 helps to determine fertility of soil
 helps to determine type of crop to grow
 helps to know the water holding capacity of the soil.
 helps to determine the type of fertilizer to use / apply

(d) (i)
 Identifying the problem
 Observation
 Experimenting
 Analyzing data
 Drawing conclusions
 Hypothesis
 Collection of data


 Engineering
 Medicine
 Agriculture
 Pharmacy
 Electronics
 etc


 (a) (i) What is an alloy?
(ii) State two causes of corrosion of metals.

(b) (i) What is a planet?
(ii) Name two planets between the Sun and the Earth.

(c) State four functions of the circulatory system in humans.

(d) (i) Define the term crop rotation.
(ii) Give one example of a chemical method of controlling pests on crop farms.

(a) (i) It is a uniform mixture of a metal and another metal or non-metal or two or more metals

 Presence of oxygen / air
 Presence of moisture / water
 Presence of alkali
 Presence of salt
 Presence of acid

(b) (i) It is a heavenly body that moves round the sun / star

 Mercury
 Venus

 Transports blood
 Transports hormones / drugs / chemical
 Transports oxygen to cells / tissues / organs of the body
 Transports nutrients / glucose to organs
 Carries away excretory products / CO2 / waste materials / urea.
 Regulates body temperatures / transport
 Consists of / transports white blood cells / antibodies / attack foreign bodies.
 Transports blood platelets to clot blood
 responsible for pumping blood / erection of penis / clitoris

(d) (i)
It is a system of farming where different types of crops are grown on the same piece of land but on different plots in a definite order / cycle / sequence from season to season.


It is a system of farming where variety of crops are grown on the same piece of land in a repeated cycle


 spraying of recommended / appropriate pesticides
 placement of recommended / appropriate pesticides

End Of Paper

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