Actual WASSCE Integrated Science Past Questions and Answers

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UPDATED WASSCE SYLLABUS FOR INTEGRATED SCIENCE AND DOCS FOR TEACHING INT. SCIENCE

Integrated Science : Active Transport, Diffusion, Osmosis, Practical Lesson SHS

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The integrated science papers are ;

Paper 1 Objectives

Paper 2 theory

Paper 3 Practical’s.

 

Students were asked to answer the questions on the Question paper.

You’ll be required to answer Four Questions only. 

Duration is usually 1 1/2 hours for the Paper 2.

2022 examination past questions and answers integrated science

1.  (a)    (i)  Name three substances that are excreted from human body

(ii)  Name two organs in humans which perform excretory functions

(b)    (i) what is grafting as used in crop production?

(ii)  State three benefits of Grafting

(c)      (i) Two ways in which scientific methods is important

(ii)  Give one reason for each of the following

a0   Do not wear rubber slippers to The laboratory

b0    Close all tabs before leaving the laboratory

c0    Spell liquids must be clean immediately

(d)          (i) Explain briefly the term earthing as used in household wiring

(ii) Name two sources of electric power generation

 

Answers

1.  (a)    (i)   Three substances that are excreted from human body

Carbon dioxide
Salt
Bile pigment
Urea

(ii)  Two organs in humans which perform excretory functions.

Liver

Skin

Lungs

Kidneys.

(b)    (i) Grafting as used in crop production?

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Grafting is a process in which part of different plants known as the shoot or Scion is connected or joined to another plant of the same species known as the stock to grow as one plant

(ii)   Three benefits of Grafting

Can be done under any weather condition

Easy method of Multiplication of plants

Can be use to produce varities of the same plant

Early Maturity

 

(c)      (i) Two ways in which scientific methods is important

Helps to identify Problems

Provides logical procedure at drawing valid conclusions

(ii)  one reason for each of the following

 

a0   Do not wear rubber slippers to The laboratory

To avoid slipping that may cause damage or hurt

b0    Close all tabs before leaving the laboratory

To Avoid flooding with water.

c0    Spill liquids must be clean immediately

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To Avoid slipping

(d)          (i) Explain briefly the term earthing as used in household wiring

It is the transfer of electrical charges from the atmosphere directly to the earth through a wire buried in the  ground.

(ii) Two sources of electric power generation

Solar, Wind, Biogas , Nuclear, Hydro/water , Diesel

Question 2

2.  (a)    (i) Give four reasons why farmers should be discouraged from using chemical fertilizers

(b)    (i) what is temporary hard water?

(ii) Write a chemical equation to show how the Temporary hard water can be softened  by heating.

(c)      (i) What is lever

(ii)Explain each of the following terms as applied to simple machines

a0   Mechanical advantage

b0  Velocity ratio

(d)          (i) what is food processing

(ii) State

a0  two advantages of food processing

b0  One disadvantage of food processing

 

Answers

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2.  (a)    (i) Four reasons why farmers should be discouraged from using chemical fertilizers

Are harmful to soil living organism

They are expensive

It increases the acidity of the soil

It can cause food poisoning

They are easily leached

(b)    (i) Temporary hard water

This is the hardness of water caused by hydrogen carbonates (bicarbonates) of calcium and magnesium  pg 37 Integrated science for senior high schools 2. gov text books.

(ii) Write a chemical equation to show how the Temporary hard water can be softened  by heating.

Ca(HCO3)2   – CaCO3  + CO2  + H2O   or  Mg(HCO3)2  – heat – MgCO3  + CO2  + H2O

(c)      (i) lever

Is a rigid bar which moves freely around a Pivot.

(ii)   a0   Mechanical advantage

Mechanical Advantage is the ratio of the loan to the effort applied to the machine.

b0  Velocity ratio

Is the ratio distance moved by the effort to the distance moved by the load.

(d)          (i) Food processing

Is the chemical operations on food in order to preserve it.

(ii) a0  two advantages of food processing

Increases the commercial value of food

improves the shelf life of food products

Makes food available for easy marketing

Allows the addition of food nutrients to improve it quality

 

b0  One disadvantage of food processing

Loss of nutrient

Food may not taste well

Frequent intake may lead to serious health issues.

 

 

Question 3

3.  (a)    (i) Mention three benefit that Ghana could derived from nuclear energy.

(ii) List two types of nuclear radiation

(b) State the scientific principle involved in each of the following local industry

a0 Kenkey production
b0 Soap production
c0 Salt production
d0 Vegetable oil production
e0 Gari processing

 

(c)      (i) list two micronutrients in the soil

(ii) Differentiate between broadcasting and side dressing method of fertilizer application

 

(d)          (i) Differentiate between conductors and semiconductors

(ii) Name two appliances in a home which use semiconductors

Answers

3.  (a)    (i) Three benefit that Ghana could derived from nuclear energy.

Generation of Electricity

For the treatment of Cancer

For Research

For the Production of nuclear weapons

(ii) Two types of nuclear radiation

Alpha particles

Beta Particles

Gamma rays

(b) scientific principle involved in each of the following local industry

a0 Kenkey production    Fermentation 
b0 Soap production       Saponification 
c0 Salt production           Evaporation 
d0 Vegetable oil production    Fermentation / Chemical extraction
e0 Gari processing             Fermentation / Evaporation 

 

(c)      (i) Two micronutrients in the soil

Chloride

Iron

Boron

Copper

Nickel

(ii) Difference between broadcasting and side dressing method of fertilizer application

Broadcasting methods of fertiizer application involved the use of hand to spread the fertilizer over the soil Whilst  side dressing is when the fertilizer is placed in one particular spot near the plant or the the roots of grain crops

(d)          (i) Difference between conductors and semiconductors

Conductors are materials which allow electrons to pass through them (seekersnewsgh) Whilst  Semi-conductors are solid materials which electrons are held in covalent bond or materials whose conductivity lies between conductors and insulators.

(ii) Name two appliances in a home which use semiconductors

Solar panel

LED Bulbs

Microwave

Central Processing Unit CPU

Washing Machines

Radio Sets

TV sets

Question 4

4.  (a)    (i) state three conditions to be considered when selecting viable seeds for planting

(ii) State two characteristics of good seeds

(b)    (i) state ohm’s law

(ii) A resistor has a resistance of 12.5 ohms. If a current of 10 Amperes passes through the resistor, calculate the potential difference across a resistor.

(c)      (i) Differentiate between a pandemic and an an epidemic

(ii) state two roles of the world health organisation  (seekersnewsgh) in a management of the COVID-19 disease

 

(d)          (i) Name two instrument used for measuring the volume of liquids accurately

(ii) Give three reasons why a crate measurement is necessary

Answers

4.  (a)    (i) Three conditions to be considered when selecting viable seeds for planting

Cost of Seed

Desired Colour

Moisture content of the seed

Seed must be free from infection

only whole seed must be selected

(ii) Two characteristics of Good seeds

Free from Dirt

Disease  Free

Free from Pest

Free from holes

(b)    (i) Ohm’s law

States that the current flowing through a conductor is directly proportional to the potential difference across the conductor, provided the temperature  and other physical properties remains constant.

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(ii) A resistor has a resistance of 12.5 ohms. If a current of 10 Amperes passes through the resistor, calculate the potential difference across a resistor.

V = IR

V = 10 x 12.5

V = 125V

(c)      (i) Difference between a pandemic and an an epidemic

Pandemic is a disease occurring world wide over wide area crossing international boundaries which usually effects a large number of people Whilst Epidemic is a disease that affects a large number of people within a community or population/region.

(ii) Two roles of the world health organisation in a management of the COVID-19 disease

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Establishes a Respond fund

Research

Distribute very important medical supplies

Provide education on the disease

Advices countries on critical interventions

(d)          (i) Two instrument used for measuring the volume of liquids accurately

Pipette

Burette

Volumetric Flask

Calibrated Beaker

(ii) Three reasons why a crate measurement is necessary

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To prevent cheating

To prevent Wastage

To avoid error

Avoid over dose and under dose of medicine

 

Question 5

5.  (a)    (i) Give three examples of endoparasites of cattle

(ii) Enumerate two method of controlling pest of cattle

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(b)    (i) What is a formula mass of a compound?

(ii) An atom Q has 12 neutrons and 11 protons

a0 Calculate its mass number

b0 Write its electron configuration

c0 What type of ion will Q for me no compound

(c)      (i) state two ways by which humans could be protected from harmful effects of radioactivity

(ii) Give three uses of radioisotopes

a0   Do not wear rubber slippers to The laboratory

b0    Close all tabs before leaving the laboratory

c0    Spell liquids must be clean immediately

(d)          State five effects of climate change on humans

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Answers

5.  (a)    (i) Three examples of Endoparasites of cattle

Tapeworm

Liver Flukes

Round worm

Pin Worm

(ii) Two method of controlling pest of cattle

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Dipping / Oral method

Hand picking

Quarantine

Good Farm sanitation

Using recommended repellants

(b)    (i)Formula mass of a compound?

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Integrated Science : Active Transport, Diffusion, Osmosis, Practical Lesson SHS

It is the sum of relative atomic mass of atoms that constitute a chemical formula

(ii) An atom Q has 12 neutrons and 11 protons

Number of protons + number of neutrons = 11 + 12  = 23

b0 Write its electron configuration

2, 8, 1

c0 Type of ion will Q form in  a compound

Cation

(c)      (i) Two ways by which humans could be protected from harmful effects of radioactivity.

Minimize time of exposure

Move far away from source of radiation

By using protective clothing

(ii) Three uses of radioisotopes

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For food preservation

Pest Control

Crop improvement

Sterilization of equipment

Use as a fuel in nuclear reactor

To establish ages of various objects

(d)          Five effects of climate change on humans

Change in rainfall  affects farming /food availability

It can lead to shortage of food /rise in hunger

River overflow their banks affecting crops

Frequent flooding displaces people

Drought can lead to scarcity of water for humans.

It leads to hotter or warmer temperature which increases heat related illness

Question 6

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6.  (a)    (i) What are alkanoates ?

(ii) state three uses of alkanoates

(b)    (i) Explain the term weathering

(ii) State three ways of maintaining soil fertility on a sloppy land

(c)      (i) Give two reasons why genetic variation is important in living organisms

(ii) Give three examples of genetic variations in humans

(d)          (i) State Archimedes principles

(ii) A box of volume 200 M3 float on Sea water of density 10.30 kg per cubic metre.
Calculate the Upthrust of the sea water on the boat [g = 10 ms-2 ] Name two sources of electric power generation

Answers

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6.  (a)    (i) What are alkanoates ?

They are products /esters / salts formed  when an organic acid reacts with an alcohol

(ii) State three uses of alkanoates

Use as perfume

use as solvent

Use in the production of plastics / Polymers

Use in making glycerol

 

(b)    (i) Explain the term weathering

Is the breakdown of rocks into smaller into smaller particles to form soil.

(ii) Three ways of maintaining soil fertility on a sloppy land

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Cover cropping

Strip Cropping

Terracing

Countour ploughing

Land rotation

(c)      (i) Two reasons why genetic variation is important in living organisms

Prevents  extinction of species

Helps in disease resistance in organism

It ensures the survival of the species

(ii) Three examples of genetic variations in humans

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Skin colour

Hair Colour

Blood type

Baldness

Sickling

Dimples

Colour blindness

Albinism

Height

Rhesus factor

(d)          (i) State Archimedes principles

A body wholly or partially immersed in a fluid experiences an upward force called upthrust  which is equal to the weight of fluid displaced.

(ii) A box of volume 200 cubic metre  float on Sea water of density 10.30 kg per cubic metre.
Calculate the Upthrust of the sea water on the boat [g = 10 metre per second squared ]

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Upthrust  = Volume x density x gravity

Upthrust  =200 x 10.30  x 10

Upthrust = 20, 600 N

Learn More

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