BECE 2012 Integrated Science Past Question Paper Two

1

 (a) The diagrams below are illustrations of an experiment in the laboratory using a piece of stone, a
cork of mass 4.0 g and other necessary materials.

2012-Integrated-Science-paper-2-question-1a-image

The initial volume of water in A was read and noted. A string was attached to a piece of stone
and the stone lowered gently into the water as shown in B. The volume was again read and noted. Finally, the cork of mass 4.0 g was attached to the stone and both materials lowered gently into the water as shown in C. The volume was read and noted.

(i) Why did the level of the water rise when the stone was lowered gently into it as shown in diagram B?
(ii) Why was it necessary to attach the stone to the cork before lowering it gently into the water as shown in diagram C?
(iii) What would have happened if the cork alone were lowered gently into the water?
(iv) What is the volume of the
(a) stone?
(ß) cork?
(v) Calculate the density of the cork.

1B. A salt solution was prepared in the laboratory using the set of apparatus illustrated below.
Study the illustrations carefully and use them to answer the questions that follow.

2012-Integrated-Science-paper-2-question-1b-image

(i) Name each of the apparatus labeled I, II, III IV and V.
(ii) State one function of each of the apparatus labeled I, II, III, IV and V.

1(c) The diagram below is an illustration of the external features of a flowering plant.

Study it carefully and use it to answer the questions that follow

2012-Integrated-Science-paper-2-question-1c-image

(i) Name the parts labeled I, II, III, IV, V and VI
(ii) State one function of each of the parts labeled I, II, III, V and VI
(iii) State the two main parts of a flowering plant

1D. The diagram below is an illustration of a small farm animal.
Study it carefully and use it to answer the questions that follow

 
2012-Integrated-Science-paper-2-question-1d-image

(i) Identify the animal
(ii) Name each of the parts of the animal labeled I, II, III, IV, V and VI
(iii) Name the structure in which the animal is kept
(iv) Mention three breeds of the animal.
(v) State two management practices to be adopted in order to control diseases and pests in the rearing of the animal.

1. (a) (i) Why the level of water rose
The additional volume of the stone caused the water to be displaced upwards
Or: due to the space occupied by the stone

(ii) Why it was necessary to attach the stone to the cork
In order for the cork to be totally submerged in the water
Or:
in order for the cork to stay under the water.

(iii) What would have happened if the cork alone was lowered
It would have risen back up and floated on the water
Or:
it would not have been able to stay under the water.

(iv) (a) Volume of the stone = 2nd reading – 1st reading
= 38 cm3 – 20 cm3
= 18 cm3

(ß) Volume of the cork = 3rd reading – 2nd reading
= 40cm3 – 38cm3
= 2cm3

(v) Density of the cork = mass of cork/ volume of cork
= 4g/2cm3 = 2g/cm3 or 2gcm-3

(vi) Why the materials were lowered gently

To prevent the water from splashing which could change the volume of the water

Or: In order not to change the first reading (of the initial volume of water)

(b) (i) I – Measuring flask / volumetric flask / graduated flask
II – Beaker
III – funnel
IV – Stirrer
V – wash bottle

(ii) Functions

ApparatusFunctions

I

§ Holding a specific volume of liquid

§ Preparation of standard solutions

II

§ Measuring volumes of liquids

§ Holding a liquid substance

III

§ Transferring liquids from one container into another container (with

§ a small neck or opening)

§ ü  Pouring liquids without spilling

IV

§ For stirring a mixture to make it uniform / homogeneous

§ For stirring to dissolve a solute in a solvent

V

§ Adding water (or other liquid) to mixtures /solutions / substances

§ Rinsing laboratory equipment / apparatus

(c) (i) I – bud
II – flower
III – leaf
IV – leaf stalk / petiole
V – stem / internode
VI – roots

(ii)

Part

Function(s)

I

§  Gives rise to a new flower or leaf or shoot

II

§  Pollination (transfer of pollen grains from an anther to the stigma of

§  the flower)

§  Sexual reproduction (fusion of the male and female sex cells)

§  Fruit and seed(s) production after fertilization has occurred

III

§  Photosynthesis (manufacturing food using water, carbon, sunlight

§  and chlorophyll)

§  Transpiration (loss of water vapour through stomata)

§  Gaseous Exchange

§  Food storage in some plants

V

§  Supports / holds the branches and leaves of the plant

§  Transports food from the leaves to other parts

§  Transports water and mineral salts from the soil to other parts

§  Stores extra food

VI

§  Holds the plant firmly in the ground

§  Absorbs water and mineral salt from the soil for the plant’s use.

§  Stores extra food

(iii) Sexual Reproductive part and vegetative part

(d) (i) rabbit

(ii) I – ear
II – whiskers
III – belly
IV – hind limb / leg
V – tail
VI – rump

(iii) hutch

(iv) Alaska, American White, Chinchilla, Polish, Rose, English, Flemish giant, Dutch, Beveren, etc,
[any three]

(v) Practices to control diseases and pests
? Provision of clean drinking water and healthy feed
? Keeping the hutch clean, well ventilated and at a suitable temperature at all times
? Regular veterinary examination / services of the rabbits
? Separating unhealthy or infected animals from the healthy ones
? Vaccination against infections / diseases [any two]

2

 (a) (i) What is technology?
(ii) State one use of technology in communication

(b) Write and balance each of the following chemical equations:
(i) Fe + O2 -> Fe2O3;
(ii) Na + Cl2 -> NaCl;
(iii) H2 + O2 -> H2O

(c) State one function of each of the following components of a typical cell:
(i) nucleus;
(ii) chloroplast;
(iii) mitochondrion

(d) Mention four cultural practices in vegetable crop production

(e) Name two agencies in food safety and quality assurance in Ghana.

(a) (i) Technology
The use of scientific knowledge to solve problems in everyday life
Or
The application of scientific knowledge and methods to make life / work easier, faster and more comfortable
Or
The study, development, and application of devices, machines, and techniques for manufacturing and productive processes

(ii) Uses of technology in communication
? Making telephone calls
? Sending a text messages
? Sending a fax
? Sending an e-mail
? Online chatting (on social networks)
? Searching for information on the internet
? Typing and printing documents
? Photocopying documents
? Scanning documents
[any one]

(b) (i) 4Fe + 3O2 -> 2Fe2O3
(ii) 2Na + Cl2 -> 2NaCl
(ii) 2H2 + O2 -> 2H2O

(c)

 

Component

Function

(i)

Nucleus

§    Controls the life activities of the cell

§    Contains the genes (for hereditary traits)

§    Controls cell reproduction

(ii)

Chloroplast

§    Contains chlorophyll, which absorbs energy

from sunlight /light

(iii)

Mitochondrion

§    Generate chemical energy for cell functions

§    Control cell cycle / cell growth and death

(d) Cultural practices in vegetable crop production

? Weeding
? Stirring (the soil)
? Watering / irrigation
? Earthing up
? Mulching
? Thinning out
? Pruning
? Staking
? Supplying-in
? Application of fertilizer

(e) Agencies in food safety and quality assurance
? Food and Drugs Board
? Ghana Standards Board
? Ministry of Food and Agriculture
? Ministry of Health

3

 (a) Explain why a tomato plant is likely to wilt if too much fertilizer is applied to it.

(b) (i) Give two differences between electrical insulators and electrical conductors.
(ii) State two effects of illegal electrical connections in the home.

(c) Explain each of the following terms as used to describe change of state of matter:
(i) condensation;
(ii) freezing

(d) (i) State two diseases of the circulatory system in humans
(ii) Mention two ways in which each of the diseases you have stated in (d) (i) can be prevented.

3. (a) Why a tomato plant is likely to wilt if too much fertilizer is applied to it.
Nitrogen-rich fertilizers encourage top growth of tomato plants at the expense of root formation. Once hot weather begins, the root system is insufficient to transport the water needed to keep the top green growth alive, and the plant wilts.

(b) (i) Differences

Electrical Insulators

Electrical Conductors.

Does not allow electricity to flow through

Allows electricity to flow through

Has no free electrons

Has free electrons

Has a wide forbidden energy gap

Has no forbidden energy gap

Electrons are firmly bound to the nucleus

Electrons are loosely bound to the nucleus

(ii) Effects of illegal electrical connections in the home.
? Improper working of electrical appliances
? Fire outbreaks
? Destruction of electrical appliances
? Power cuts
? Financial waste

(c) Explanation as used to describe change of state of matter:
(i) Condensation;
The change of the physical state of matter from gaseous state into liquid state
Or
The process by which a vapour loses heat and changes into a liquid

This happens because the vapour molecules slow down due to the heat loss and the distances between molecules reduce.

(ii) Freezing
The change of the physical state of matter from the liquid state to the solid state
Or:
The process by which a liquid loses heat and changes into a solid

This happens because the liquid molecules slow down and stop moving about randomly due to the heat loss and the distances between molecules reduce.

(d) (i) State two diseases of the circulatory system in humans
? Haemorrhoid
? High blood pressure
? Low blood pressure
? Leukemia
? Arteriosclerosis
[any two]

(ii) Ways in which the diseases stated in (d) (i) can be prevented.

DISEASES

PREVENTION

Haemorrhoid

§   Drinking lots of water

§   Eating a lot of fruits and vegetables

§   Freeing the bowels as frequently as possible

§   Exercising the body regularly

§   Using hygienic and soft toilet paper

High blood pressure

§   Reducing salt intake

§   Avoiding drinking alcoholic beverages

§   Avoiding smoking

§   Exercising regularly

§   Reducing emotional stress

§   Reducing fat intake

§   Increasing fruits and vegetable intake

§   Having enough sleep

Leukemia

§   Avoiding exposure to certain radiations

§   Avoiding exposure to certain chemicals

§   Avoiding smoking

Arteriosclerosis

§   Exercising the body regularly

§   Reducing the intake of animal fat

§   Taking more fruits and vegetables

§   Avoiding smoking

4

(a) (i) What is a transistor?
(ii) Give two uses of a transistor

(b) Mention the suitable solvent for each of the following solutes:
(i) grease;
(ii) ink stain
(iii) starch
(iv) cube
(v) sugar
(vi) oil
(vii) paint
(viii) iodine

(c) (i) What is a respiratory organ?
(ii) Name two structures of the respiratory system of humans.

(d) (i) What is agricultural chain?
(ii) Name two types of agricultural chain

4. (a) (i) A transistor
A small low-powered solid-state electronic device consisting of a semiconductor and at least three electrodes, the emitter, the base and the collector

(ii) Uses of a transistor
– As current amplifiers
– As current rectifier
– As an electronic switch in integrated circuits
– As a regulator – to regulate current, voltage or power.
– Used in oscillator circuits

5

(a) (i) What are stars?
(ii) Arrange in order, starting from the sun, the first four planets in the solar system.

(b) (i) State two differences between plants and animals;
(ii) two similarities between plants and animals

(c) Explain each of the following farming systems:
(i) pastoral farming
(ii) ecological farming

(d) State the properties of water in terms of
(i) odour,
(ii) taste,
(iii) effect on litmus

5. (a) (i) Stars
Stars are heavenly bodies that are made up mostly of burning gases

(ii) The first four planets in order
Mercury, Venus, Earth, Mars

(b)
(i) Differences

PLANTS

ANIMALS

Manufacture their own food

(photosynthesis)

Do not manufacture their own food

Cannot move freely from place to place

Able to move freely from place to place

Most plants do not respond quickly to

stimuli

Respond quickly to stimuli

Have a cell wall

Do not have a cell wall

Have chloroplasts, which contain

chlorophyll

Do not have chloroplast

Excess carbohydrates are stored as starch

Excess carbohydrates are stored as

glycogen

Absorb carbon dioxide for photosynthesis and release oxygen as waste product

Inhale oxygen for respiration and release carbon dioxide as waste product

Cells have large and permanent vacuoles

Cells have small temporary vacuoles

Growth takes place at specific parts

Growth takes place at all parts

(ii) Similarities between plants and animals
? Both plants and animals are living things / organisms
? Both plants and animals respire
? Both plants and animals grow
? Both plants and animals reproduce
? Both plants and animals feed
? Both plants and animals excrete
[any two]

(c) Explanation
(i) Pastoral farming
A farming system in which farm animals such as cattle and sheep are moved from place to place in search of food and water. The animals feed on natural vegetation and drink water from water bodies such as streams, rivers, ponds, etc

(ii) Ecological farming
A method of farming in which the natural vegetation and animals and their environment are preserved
Chemicals and heavy machinery are not used. The soil is fertilized using organic manure, such as animal droppings. Pests and diseases are controlled biologically, ie, using
resistant crops and animals

(d) Properties of water
(i) Odour – Water is odourless (it has no odour / smell)
(ii) Taste – Water is tasteless (it has no taste)
(iii) Effect on litmus
– Water has no effect on litmus paper
OR
– There is no colour change of the litmus paper
OR

6

(a) What are
(i) annual plants?
(ii) perennial plants?

(b) Mention one danger involved in each of the following activities in the laboratory:
(i) eating or drinking water in the laboratory;
(ii) washing hands with unknown liquid in a beaker;
(iii) walking barefooted.

(c) (i) What is a digestive enzyme?
(ii) Give two examples of digestive enzymes in humans.

(d) Give two differences between conduction and radiation

6. (a) (i) Annual plants
Plants that complete their life cycle in one season or one year

(ii) Perennial plants
Plants that continue to live for several years (usually three or more)

(b) Dangers involved in
(i) Eating or drinking water in the laboratory;
? The food or drink can get contaminated by toxic substances, which could lead to poisoning
? The food or drink can spill or drop into other substances in the laboratory, which could lead to accidents and injuries.

(ii) Washing hands with unknown liquid in a beaker;
? The unknown liquid could be toxic, which will cause fatal injuries or even death.
? The unknown liquid could be harmful or irritant, which could cause severe harm or injuries or irritation to the hands or body

(iii) Walking barefooted.
? One could step on a slippery substance and slip or fall, causing injuries to the body
? One could step on a toxic or irritant substance, which could cause severe harm or injuries or irritation to the feet or body

(c) (i) Digestive enzyme
A biological catalyst which speeds up the digestion of food substances in the body of an animal
Or
A complex chemical, produced in the body of an animal, which speeds up the process of digestion

(ii) Examples of digestive enzymes in humans.
Ptyalin, pancreatic amylase, trypsin, pepsin, rennin, lipase, maltase
[any two]

(d) Differences

Conduction

Radiation

Requires a material medium

Does not require a material medium

Process is relatively slow

Process is relatively very fast

Heat is transferred by contact of

molecules or atoms.

Heat is transferred by waves or rays

End Of Paper

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