Kuulchat - BECE SCIENCE 2014

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OBJECTIVE TEST

Which of the following type of teeth is used by mammals to tear food material?

Canines

Incisors

Molars

Premolars

The eclipse formed when the moon comes between the sun and the earth is known as……………

annular eclipse

lunar eclipse

solar eclipse

total eclipse

The element with the chemical symbol S is ……

silicon

silver

sodium

Sulphur

The term leaching in soils refers to .....

accumulation of organic matter

decomposition of plant material

fixation of nitrogen

removal of soil nutrients by water

Which of the following statements about plant cell is correct? It

does not have a nucleus

contains large vacuoles

is surrounded by the cell membrane only

does not have a definite shape

An example of a derived quantity is

length

mass

temperature

volume

Solid non-metals normally break into pieces when hammered because they are

brittle

ductile

lustrous

malleable

Young rabbits are called

bunnies

cubs

fingerlings

kids

Producers in an ecosystem are plants that

attract insects

feed on other plants

feed on dead materials

manufacture their own food

10.

The form of energy produced from the nucleus of an atom is termed

chemical energy

mechanical energy

nuclear energy

thermal energy

11.

Which of the following elements is a semi-metal?

Carbon

Nitrogen

Silicon

Sodium

12.

A system of farming that leads to continuous destruction of virgin forests is

mixed farming

mixed cropping

pastoral farming

shifting farming

13.

The by-products of respiration are

carbon dioxide and heat

carbon dioxide and water

oxygen and heat

oxygen and water

14.

Which of the following statements about a force are correct? It

I. is measured in newtons.

II. is measured in newton-metre.

III. can start a motion.

IV. can change the direction of a moving body.

I and II only

I and III only

I, III and IV only

I, II, III and IV

15.

Which of the following substances is a solid-gas mixture?

Lather

Bronze

Steel

Smoke

16.

Weeds on a by school farm could be controlled by

handpicking

mowing

ploughing

tilling

17.

An example of a non-living tissue used in osmosis experiment is

cellophane

filter paper

potato

polythene

18.

Kerosene is poured on the surface of a pond in order to

make it unsafe for human consumption

make it safe for animal consumption

increase the surface tension

break the surface tension

19.

Which of the following processes is used to separate insoluble solids from liquids?

Crystallization

Evaporation

Filtration

Sublimation

20.

The process of removing unproductive poultry birds from a flock is referred to as

candling

culling

dehorning

drenching

21.

Which of the following pairs of diseases can be spread easily when food is exposed to houseflies?

Dysentery and malaria

Malaria and tuberculosis

Dysentery and cholera

Cholera and tuberculosis

22.

The pressure in fluids

acts differently in all directions

acts upwards at any point

decreases with depth

increases with depth

23.

Which of the following processes involve a change in the state of matter from liquid to solid?

Evaporation

Freezing

Melting

sublimation

24.

Which of the following food items contains the highest amount of dietary fiber?

Beans

Bread

Cabbage

Egg

25.

An example of a disease vector is

earthworm

liver fluke

tapeworm

tick

26.

Which of the following devices is made of semiconductor?

Capacitor

Inductor

Resistor

Transistor

27.

Which of the following statements about the properties of water are correct? It

I. is colourless and tasteless

II. is neutral to litmus paper

III. turns red litmus paper blue

IV. is a universal solvent

I and II only

I and III only

I, II and IV only

I, III and IV only

28.

The study of the soil profile of an area helps the farmer to

control weed growth

determine the soil temperature

determine the types of crop to grow

know the pesticides to use

29.

When a green leaf is placed in a test tube containing ethanol and heated over a water bath the leaf

becomes soft

changes colour to brown

changes colour to blue-black

is decolorized

30.

Which of the following source(s) of energy is/are renewable?

I. Solar

II. Crude oil

III. Wind

I only

I and II only

I and III only

I, II and III

31.

Which of the following substances is a compound?

Hydrogen

Nitrogen

Oxygen

Water

32.

A disease-causing organism that is most difficult to control in crop production is

bacterium

fungus

nematode

virus

33.

Which of the following organisms is/are multicellular?

I. Amoeba

II. Paramecium

III. Onion

I only

III only

I and III only

II and III only

34.

In electronic circuits, LEDs are used to indicate the absence or presence of

emitter and collector

electric current

p-n junction

voltage source

35.

Steel is an alloy of iron and

aluminum

carbon

silicon

gold

36.

Soil aeration could be improved through

mulching

irrigation

soil drainage

fertilizer application

37.

Which of the following pairs of structures are parts of the respiratory system of humans?

Fallopian tube and alveoli

Pharynx and esophagus

Trachea and alveoli

Trachea and duodenum

38.

Which of the following effects is not a result of illegal connection of electricity?

It can

lead to fire outbreak

lead to frequent power cut-off

increase the flow of current in the supply chain

cause damage to electrical appliance

39.

Which of the following statements about the scientific method is/are correct? It provides

I. logical procedure for arriving at knowledge

II. knowledge that can be verified

III. knowledge that can never be changed

I only

I and II only

I and III only

II and III only

40.

An entrepreneur's decision as to what to produce is a/an

co-ordinating function

organizing function

planning function

supervising function

THEORY QUESTIONS

(a)

The diagram below represents the stages in the life cycle of a mosquito.

Study the diagrams carefully and answer the questions that follow.

(i)

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

(ii)

State how stage II obtains oxygen.

(iii)

State two methods of controlling each of the stages labelled III and IV.

(b)

The diagrams below are different laboratory set-ups used in the separation of mixtures.

Study the diagrams carefully and answer the questions that follow.

(i)

Name each of the parts labelled I, II, III, IV and VI.

(ii)

Name the separation method represented by each diagram.

(iii)

Which of the set-ups is used to obtain clear water from muddy water?

(iv)

Which of the set-ups is used to obtain salt from salt solution?

(c)

The diagrams below show some instruments used in the laboratory.

Study the diagrams carefully and answer the questions that follow.

(i)

Identify each of the instruments labelled I, II, III, IV and V.

(ii)

State one use of each of the instruments labelled I, II, III and IV.

(iii)

Read and record the volume of the liquid in the instrument labelled V.

(d)

The diagram below shows the digestive system of a class of farm animals.

Study the diagram carefully and answer the questions that follow.

(i)

Name each of the parts labelled I, II, III and IV.

(ii)

State one function each of the parts labelled II and IV.

(iii)

Name two farm animals that possess this type of digestive system.

(iv)

Mention two diseases which affect this class of farm animals.

Show Solution

(a)

(i)

I → (Raft of) eggs
II → Larva
III → Pupa
IV → (Adult) mosquito

(ii)

How the larva obtains oxygen

It takes oxygen from the atmosphere/surface of water through its breathing tubes.

(iii)

Methods of controlling pupa

1. Introducing predators such as fishes into stagnant water or pond water/use of biological methods of control
2. Pouring of oil/kerosene on surface of the water
3. Draining of stagnant water

Methods of controlling adult mosquito

1. Spray with/Use of insecticides to kill adult mosquito
2. Use of mosquito coil
3. Clearing of weeds/bushes around houses
4. Use of special electric bulbs
5. Use f special paints such as Inesfly
6. Use of treated mosquito net

(b)

(i)

I → Beaker
II → Evaporating dish
III → Bunsen burner
IV → Funnel
VI → Tripod stand

(ii)

Methods of separation of mixtures

A → Filtration
B → Evaporation
C → Sublimation

(iii)

Set-up A / Filtration

(iv)

Set-up B / Evaporation

(c)

(i)

I → Tape measure/Surveyor's tape/Measuring tape/Tape
II → Stop clock/Stop watch
III → Thermometer
IV → Weighing scale / Balance/ Top pan balance
V → Measuring cylinder

(ii)

Use of instruments labelled

I → For measuring lengths/distance
II → For measuring time
III → For measuring temperature
IV → For measuring weight or mass of objects

(iii)

The volume of the liquid in the measuring cylinder is 160 cm³

(d)

(i)

I → Oesophagus
II → Gizzard
III → Liver
IV → Crop

(ii)

Function of II (Gizzard)

It is for grinding food.

Function of IV (Crop)

It is used to temporarily store food.

(iii)

Farm animals that possess this type of digestive system

1. Fowl/chicken
2. Cattle/cow
3. Turkey
4. Goat
5. Ducks
6. Sheep
7. Guinea fowl
8. Horse

(iv)

Diseases which affect this class of farm animals

Monogastrics

1. Coccidiosis
2. Pullorum
3. Newcastle
4. Fowl pox
5. Gumboro
6. Bacillary diarrhea
7. Fowl cholera
8. Chronic respiratory disease
9. Bird/Avian flu

Ruminants

1. Foot and mouth disease
2. Anthrax
3. Cow pox/Vaccinna
4. Rinderpest
5. Goat pox
6. Pneumonia
7. Tryponosomiasis/Nagana
8. Tuberculosis

(a)

(i)

Name the two elements that combine to form water.

(ii)

Write a balanced chemical equation to show how the water is formed from the named elements.

(b)

State two ways of maintaining a balance in an ecosystem.

(c)

(i)

What is a fertile soil?

(ii)

State two factors that cause loss of soil fertility.

(d)

Classify the following items as magnetic or non-magnetic substance: wood, steel blade, rubber and glass jar.

Show Solution

(a)

(i)

Elements that combine to form water

1. Hydrogen
2. Oxygen

(ii)

2H₂ + O₂ → 2H₂O

H₂ + $\frac{1}{2}$ O₂ → H₂O

(b)

Ways of maintaining a balance in an ecosystem

1. Avoid overgrazing
2. Pollution of environment must be avoided
3. Avoid deforestation or re-planting of trees/aforestation
4. Indiscriminate hunting of animals should be avoided
5. Farmers should be educated and closely monitored on the use of agro-chemicals
6. Fishermen should use right fishing net for fishing
7. Encroaching on wetlands or forests by people should be avoided
8. Mining activities should be modernized to avoid destruction habitat for organisms
9. Avoid bush burning

(c)

(i)

Fertile soil is a soil that has essential nutrients to support the growth/development of crops.

Fertile soil is a soil that has an abundance of plant nutrients/minerals orgamic matter to support plant growth.

Fertile soil is a soil which contains all the major nutrients for basic plant nutrition as well as others to support plant growth.

Fertile soil is a soil which is able to provide all essential plant nutrients in available forms and in a suitable balance to support plant growth.

(ii)

Factors that cause loss of soil fertility

1. Soil erosion
2. Leaching
3. Bush burning
4. Continuous cropping or monoculture
5. Deforestation
6. Overgrazing
7. Illegal mining
8. Soil acidification/salinization/alkanization
9. Inefficient soil management practices
10. Soil pollution/indiscriminate use of agro-chemicals

(d)

Classification of items as magnetic or non-magnetic substance

Wood → Non-magnetic
Steel blade → Magnetic
Rubber → Non-magnetic
Glass jar → Non-magnetic

(a)

(i)

What is germination of seed?

(ii)

State two conditions necessary for the germination of seed.

(b)

State four methods used in identifying farm animals.

(c)

Explain why it is easier to cut a piece of yam with a sharp knife than with a blunt knife.

(d)

State three differences between a metal and a non-metal.

Show Solution

(a)

(i)

Germination of seed is the sprouting/growth/development of the embryo/seed to produce a new plant/seedling.

(ii)

Conditions necessary for the germination of seed

1. Nature of seed coat
2. Water/moisture
3. Air/Oxygen
4. Suitable/optimum temperature/warmth
5. Viability of the seed
6. Enzymes
7. Sunlight/light
8. Dormancy period

(b)

Methods used in identifying farm animals

1. Tattooing
2. Banding
3. Ear tagging
4. Clipping
5. Leg tagging
6. Dyeing
7. Ear notching/punching
8. Implantation of microchips/radio transmitter

(c)

Why it is easier to cut a piece of yam with a sharp knife than with a blunt knife

Pressure is inversely proportional to the surface area.

Pressure = $\frac{Force}{Area}$

Pressure ∝ $\frac{1}{Area}$

With the same force, the smaller the surface area, the greater the pressure.

A sharp knife has a smaller surface area than a blunt knife. The same force used on each knife, will give greater pressure on the sharp knife than the blunt knife (smaller pressure) making cutting easier.

(d)

Differences between a metal and a non-metal

#	Metal	Non-metal
1.	Normally solid	Can be solid or liquid or gas
2.	Corrosive	Non corrosive
3.	Attracted by magnet	Not attracted by magnet
4.	Conducts electricity	Does not conduct electricity/poor conductor of electricity
5.	Conducts heat/good conductor of heat	Does not conduct heat/poor conductor of heat
6.	Malleable	Not malleable
7.	Ductile	Not ductile/Brittle
8.	High density	Low density
9.	High melting point	Low melting point
10.	Has shinning/lustre surface	Has dull surface
11.	Gives out electrons (forms cations) as reducing agent	Receives/accepts electrons (forms anions) as oxidizing agent
12.	High tensile strength	Low tensile strength

(a)

(i)

What is debeaking?

(ii)

Give two reasons why debeaking in poultry birds is important.

(b)

(i)

A steel needle carefully placed on the surface of water floats. What type of force made the steel needle to float?

(ii)

Name three substances that could be added to the water to make the steel needle to sink.

(c)

(i)

Explain why gold is preferred to iron in the making of jewelleries.

(ii)

State one way of preventing rusting.

(d)

(i)

State two elements of climate.

(ii)

Name the equipment used to measure each of the elements stated in (i) above.

Show Solution

(a)

(i)

What is refraction of light?

(ii)

Sketch a diagram to show the path of a light ray when it travels from air to glass.

(b)

Explain why it is difficult to separate iron and sulphur mixture after strong heating.

(c)

(i)

Give two examples of digestive enzymes produced in humans.

(ii)

For each of the enzymes given in (i), name the part of the human body where the enzyme is produced.

(d)

List four methods of applying fertilizers to crops.

Show Solution

(a)

Consider the substances listed below: carbon dioxide, gold, bronze, iron, oxygen and ink. From the list, select the substance that:

(i)

supports burning;

(ii)

is used as jewellery;

(iii)

is used for making statues.

(b)

(i)

Name two diseases associated with the circulatory system of humans.

(ii)

State one way of preventing each of the diseases named in (i).

(c)

Give two examples of each of:

(i)

major plant nutrients;

(ii)

minor plant nutrients.

(d)

(i)

State two properties of a good thermometric liquid.

(ii)

Give two examples of a good thermometric liquid.

Show Solution

(a)

(i)

supports burning → Oxygen

(ii)

is used as jewellery → Gold

(iii)

is used for making statues → Bronze

(b)

Name of disease	Prevention
High blood pressure (Hypertension)	1. Regular exercise 2. Low intake of salt 3. Reduce intake of fatty food 4. Avoid smoking 5. Control physical/emotional stress 6. Reduce intake of alcoholic drinks 7. Eat fruits/vegetables 8. Take in more water 9. Avoid overeating/obesity/reduce weight
Low blood pressure (Hypotension)	1. Regular exercise 2. Eating a balanced diet 3. Drinking a lot of water 4. Adopting a healthy lifestyle 5. Eat fruits/vegetables 6. Take coffee/caffeine
Piles/Haemorrhoids	1. Eat a lot of fruits/vegetables 2. Drink plenty water after meal 3. Use hygienic/soft toilet paper 4. Avoid retaining stool for long periods
Leukaemia/Blood cancer	1. Avoid smoking 2. Avoid exposure to intense ultraviolet radiation and certain chemicals like benzene
Varicose vein	1. Regular exercise 2. Avoid crossing legs when sitting 3. Avoid raising legs when sitting 4. Avoid eating too much salt 5. Avoid wearing tight clothing 6. Eat food rich in vegetables/fruits
Arteriosclerosis	1. Regular physical exercise 2. Reduce intake of animal fat 3. Avoid cigarette smoking 4. Eat more fruits/vegetables

(c)

(i)

Examples of major plant nutrients

1. Nitrogen (N)
2. Phosphorus (P)
3. Calcium (Ca)
4. Magnesium (Mg)
5. Sulphur (S)
6. Potassium (K)

(ii)

Examples of minor plant nutrients

1. Copper (Cu)
2. Iron (Fe)
3. Zinc (Zn)
4. Manganese (Mn)
5. Boron (B)
6. Chlorine (Cl)
7. Cobalt (Co)
8. Molybdenum (Mo)

(d)

(i)

Properties of a good thermometric liquid

1. It does not wet/cling to the glass tube
2. It has a large temperature range within which it remains a liquid
3. It expands and contracts regularly/uniformly
4. It does not vaporize/condense in the tube
5. It is visible/opaque

(ii)

Examples of a good thermometric liquid

1. Mercury
2. Ethanol/Alcohol

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i	Elements of climate	ii	Equipment used for measurement
Temperature		Thermometer
Rainfall		Rain gauge
Humidity		Hygrometer
Wind direction		Wind vane
Wind speed		Anemometer
Intensity of light/sunlight		Photometer/Light meter
Atmospheric pressure		Barometer

Name of enzyme	Part of the human body where it is produced
Ptyalin	Salivary gland
Amylase	Pancreas/Small intestine
Pepsin	Stomach
Rennin	Stomach
Lipases	Pancreas/Small intestine
Trypsin	Small intestine

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OBJECTIVE TEST

THEORY QUESTIONS

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