BECE 2015 Integrated Science Past Question Paper Two

1

(a) The diagrams below are illustrations of three different organisms harmful to farm animals
Study the diagrams carefully and answer the questions that follow

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(i) Identify each of the organisms labelled I, II and III

(ii) Which of the organisms is/are:
(α) parasite(s)
(β) pest(s)

(iii) State one effect each of the following organism on farm animals
(α) I;
(β) II;
(γ) III.

(iv) State three methods of controlling the organism labelled III

(b) The diagram below illustrates a burning candle placed in front of a plane mirror MM′ and an image of the candle formed in the mirror.
Study the diagram

carefully and answer the questions that follow
2015-Integrated-Science-paper-2-question-1b-image

(i) Name the parts labelled I, II, III and IV
(ii) State the relationship between angles θ1 and θ2
(iii) Give three characteristics of IV in the diagram
(iv) Explain why IV is represented in broken lines

(c) In an experiment to investigate the reactivity of sodium, a piece of sodium metal was dropped in a beaker containing water. The experimental set-up is as illustrated below.
Study the set-up carefully and answer the questions that follow

2015-Integrated-Science-paper-2-question-1c-image

(i) State what would happen if a glowing splint was held at the mouth of the beaker
(ii) Name the gas evolved
(iii) Write a balanced chemical equation for the reaction that occurred
(iv) Name two other metals that can react in a similar ways as the sodium

(d) An experiment to investigate the conditions for germination of viable bean seeds was carried out. The diagrams below are illustrations of the different conditions in which the seeds were kept. The beakers labelled A, B and C containing the seeds were kept at room temperature.

Study the diagrams carefully and answer the questions that follow

 
2015-Integrated-Science-paper-2-question-1d-image

(i) State what would happen to the seeds in each of the beakers labelled A, B and C when the experiment was observed after five days. [3 marks]
(ii) Give reasons for each of your answers in (i)
(iii) Why was oil spread on the surface of the water in the beaker labelled C?

1. (a)
(i) Identify each of the organisms labelled I, II and III
I. – Louse
II. – Tsetse fly
III. – Tapeworm

(ii) Which of the organisms is/are:
(α) parasite(s)
Louse and tapeworm

(β) pest(s)
tsetsefly

(iii) State one effect each of the following organism on farm animals
(α) I: Sucks blood of animals, resulting in anaemia
(β) II: Infects animals with sleeping sickness, which can lead to death
(γ) III. feeds on the digested food nutrients in the body of animal, which affects the immune system and leads to weakness and ill-health

(iv) State three methods of controlling the organism labelled III
• Deworming,
• regualar checks by veterinary personnel
• Proper disposal of sewage
• clean grazing on low risk pasture

1(b)
(i) Name the parts labelled I, II, III and IV

I. – Incident ray
II. – Normal
III. – Reflected ray
IV. – Image

(ii) State the relationship between angles θ1 and θ2
Angles θ1 and θ2 are equal

(iii) Give three characteristics of IV in the diagram
 it is erect (upright)
 it is virtual
 It has the same size as the object
 Its distance to the mirror equals the distance of the object from the mirror
 It is formed behind the mirror

(iv) Explain why IV is represented in broken lines
IV is represented in broken lines because it is a virtual (not a real) image (cannot be captured on a screen)

1(c) (i) State what would happen if a glowing splint was held at the mouth of the beaker

The glowing splint would be ignited (become aflame / catch fire)

(ii) Name the gas evolved
Hydrogen

(iii) Write a balanced chemical equation for the reaction that occurred
2 Na + 2 H2O → 2 NaOH + H2

(iv) Name two other metals that can react in a similar ways as the sodium
Lithium, Potassium

1(d)
(i) State what would happen to the seeds in each of the beakers labelled A, B and C when the experiment was observed after five days. [3 marks]
Beaker A – Seeds do not germinate
Beaker B – Seeds germinate
Beaker C – Seeds do not germinate

(ii) Give reasons for each of your answers in (i)

 Seeds in beaker A do not germinate because there is no water / moisture present
 Seeds in beaker B germinate because all the conditions necessary for germination, namely, moisture, air, optimum temperature and viable seed are present.
 Seeds in beaker C do not germinate because there is no air present (due to layer of oil on water surface)

(iii) Why was oil spread on the surface of the water in the beaker labelled C?[2 marks]
To prevent air (atmospheric oxygen) from getting dissolved in the water and reaching the seeds

2

(a) (i) What is weather?
(ii) State two differences between weather and season

(b) State the composition of each of the following alloys;
(i) steel;
(ii) stainless steel

(c) List four benefits of vegetables to humans

(d) The diagram below is an illustration of life-cycle of a flowering plant.

 
2015-Integrated-Science-paper-2-question-2d-image

Name each of the stages labelled I, II, III and IV

2. (a) (i) What is weather?
The atmospheric condition of a place at a particular time.
or
The state of the atmosphere at a particular place and time
or
The condition of the atmosphere of a place over a short period of time

(ii) State two differences between weather and season
WEATHER SEASON
Atmospheric condition of a place over a short period of time The average atmospheric condition of a place over a longer period of time within a year
Changes relatively quickly (lasts for a short time, usually about a day) Changes relatively slowly (lasts for a longer time, usually 3 or more months)
It is less predictable It is more predictable

(b) State the composition of each of the following alloys;
(i) steel;
iron and carbon

(ii) stainless steel
iron, carbon and chromium

(c) List four benefits of vegetables to humans
Provide mineral salts, which supports metabolic activities for proper functioning of the body
Provide vitamins for protection against diseases
Provide dietary fibre for easy bowel movement
Provide antioxidants, which fights stress and strengthen immune system
Makes our food tastier / more enjoyable

(d) Name each of the stages labelled I, II, III and IV
I. – Pollination
II. – Fertilization
III. – Dispersion / dispersal
IV. – Germination

3

(a) Explain how
(i) lithium atom becomes positively charged
(ii) oxygen atom becomes negatively charged

(b) (i) What is potential energy?
(ii) A coconut of mass 2 kg is on a tree 5 m tall. Determine the potential energy of the coconut at this height [Take g = 10 ms–2]

(c) State four causes of teenage pregnancy

(c) State four uses of soil in agriculture.

3. (a) Explain how
(i) lithium atom becomes positively charged
Lithium has 1 electron in its outermost shell, making it unstable. In order to become stable, it loses the electron on its outermost shell. As a result, the atom becomes positively charged, since there is now 1 more positive charge (proton) than negative charge (electron)

(ii) oxygen atom becomes negatively charged
Oxygen has 6 electrons in its outermost shell, making it unstable. In order to become stable, it gains 2 more electrons on its outermost shell to make it completely filled. As a result, the negative charges (electrons) become 2 more than the positive charges (protons), making the atom negatively charged.

(b) (i) What is potential energy?
The energy possessed by a body as a result of its position or state.

(ii) A coconut of mass 2 kg is on a tree 5 m tall. Determine the potential energy of the coconut at this height [Take g = 10 ms–2]

Potential energy = mass(m) × height(h) × acceleration due to gravity(g)
= 2 kg × 5 m × 10ms-2
= 100kgm2s-2
= 100 J

(c) State four causes of teenage pregnancy
(i) Indiscriminate / Casual sex
(ii) Irresponsible parenting
(iii) Lack of sex education in schools
(iv) Illiteracy
(v) Negative peer pressure
(vi) Lack of contraceptive use / rejection of family planning methods
(vii) Wrong application of birth control measures
(viii) Unemployment
(ix) Poverty
(x) Streetism

(d) State four uses of soil in agriculture.
• It serves as a support to agricultural crops
• It serves as a habitat (home) for several micro-organisms, which are important for plant growth.
• It holds water for the use of agricultural crops and animals.
• It contains mineral salts which are used by crops for healthy growth.
• It supports grass and other plants, which farm animals feed on for their sustenance
• It helps maintain suitable temperature for the development of plant roots and micro-organisms.

4

(a) Give four health benefits of water to humans

(b) (i) State two ways in which crop rotation is important in crop production
(ii) Distinguish between mixed cropping and mixed farming

(c) (i) What is a fuse?
(ii) Name the colour code of the wire on which a fuse is placed in a three-pin plug
(d) (i) In a tabular form, state three differences between osmosis and diffusion
(ii) State one way in which osmosis is similar to diffusion

4. (a) Give four health benefits of water to humans
• It helps with easy bowel movement (Prevents constipation)
• It helps with the metabolic activities of the body
• It can relieve stress
• It can relieve headaches
• It promotes healthy and radiant skin
• It helps to maintain optimum blood pressure
• It helps to maintain suitable body temperature.
• It supports the proper functioning of the cells/ tissues/ organs of the body.

(b) (i) State two ways in which crop rotation is important in crop production
• It helps in maintaining soil fertility
• The legumes included in crop rotation fix atmospheric nitrogen in the soil,
• The growing of cover crops helps check soil erosion
• The system of rotation helps check pests and diseases
• There is a reduced risk of losing yield, in case of pest or disease attack.

(ii) Distinguish between mixed cropping and mixed farming

Mixed cropping – Different types of crops are grown on the same piece of land
Mixed farming – Crops are grown and farm animals are reared at different sections of the same piece of land.

(c) (i) What is a fuse?
An electrical safety device containing a piece of a metal that melts if the current running through it exceeds a particular level, thereby breaking the circuit
or
a safety device consisting of a strip of wire that melts and breaks an electric circuit if the current exceeds a safe level

(ii) Name the colour code of the wire on which a fuse is placed in a three-pin plug
Red/ brown

(d) (i) In a tabular form, state three differences between osmosis and diffusion
OSMOSIS DIFFUSION
It involves the movement of only solvent or water molecules It involves movement of solute molecules /particles
Semi-permeable membrane present No semi-permeable membrane
Applies in only liquids (solvent molecules) Applies in solids, liquids and gases
Movement of solvent molecules from lower to higher concentration Movement of solute particles from a higher concentration to a lower concentration

(ii) State one way in which osmosis is similar to diffusion
• They both involve the movement of molecules
• The particles / molecules move to cause equality in the concentrations of the regions
• presence of a concentration gradient

5

(a) (i) What is a balanced ration in animal nutrition?
(ii) State two benefits of balanced ration to poultry
(b) List four hazards that may be encountered in teaching and learning of science
(c) Name the parts of the circulatory system of humans
(d) (i) What is a simple machine?
(ii) State two methods of overcoming friction in everyday activities

5. (a) (i) What is a balanced ration in animal nutrition?
The feed allowed for a given animal during a 24-hour period which contains all the essential nutrients to the animal in the right proportion and amount .

(ii) State two benefits of balanced ration to poultry
It ensures healthy and strong birds
It increase the quality of the eggs produced
It increases the quantity of eggs produced
It increases the rate of growth

(b) List four hazards that may be encountered in teaching and learning of science
 Corrosion of one’s skin by corrosive chemicals
 Burns from open flame or explosives
 Injuries sustained from falling as a result of slippery floor
 Health risk from inhaling of poisonous gases
 Health risk from ingestion of toxic chemicals
 Skin irritation from contact with irritants
 Health risks from Electrical shocks
 Eye irritation from strong light or radiation or irritants

(c) Name the parts of the circulatory system of humans
 Heart,
 blood
 Blood vessels (arteries, veins, capillaries )

(d) (i) What is a simple machine?
A mechanical device that makes work easier and/ or faster

(ii) State two methods of overcoming friction in everyday activities
Applying lubricants such as grease / oil
Smoothening the contact surfaces
Using wheels / rollers

6

(a) (i) What is a magnetic field?
(ii) To which class of mixture does each of the following belong?
(α) Smoke
(β) Air
(γ) Bronze
(b) (i) What is plaque in human dentition?
(ii) State the function of chlorophyll in photosynthesis
(c) Identify the scientific principle underlying the operation of each of the following industries
(i) kenkey production
(ii) salt smoking
(iii) fish smoking
(iv) biogas production
(d) (i) What is plant parasite?
(ii) Give one example of a plant parasite

6. (a) (i) What is a magnetic field?
A region of space surrounding a magnet or current-carrying circuit in which the resulting magnetic force can be detected

(ii) To which class of mixture does each of the following belong?
(α) Smoke – solid-gas mixure
(β) Air – gas-gas mixture
(γ) Bronze – solid-solid mixture

(b) (i) What is plaque in human dentition?
A sticky, colorless deposit of bacteria that is constantly forming on the tooth surface
OR
A sticky, colorless film of bacteria that constantly forms on our teeth and along the gum line

(ii) State the function of chlorophyll in photosynthesis
It traps/absorbs sunlight, which provides energy for the manufacture of food

(c) Identify the scientific principle underlying the operation of each of the following industries
(i) kenkey production – fermentation
(ii) salt making – evaporation
(iii) fish smoking – food preservation
(iv) biogas production – fermentation

(d) (i) What is plant parasite?
A plant that derives some or all of nutrients and water from another living organism

(ii) Give one example of a plant parasite
dodder, mistletoe, the corpse flower, cactus mistletoe

End Of Paper

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