(i)

Functions of the skin

1. It excretes waste substances/urea/water/salts/sweat
2. It protects the body from injury
3. It regulates body temperature
4. It gives sense of touch

(ii)

Functions of the lung

1. Gaseous exchange occurs in the lungs/there is intake of oxygen and output of carbon dioxide and water vapour in the lungs
2. Excretion of carbon dioxide and water vapour takes place in the lungs

(iii)

Functions of the kidney

1. It excretes urea/water and salt
2. Urine formation

(iv)

Function of the testis

Sperm production

(i)

Vegetative reproduction is a form of reproduction whereby plants produce young ones from growing parts/buds of the parent plant.

(ii)

Plants which reproduce vegetatively

1. Potato
2. Yam
3. Cocoyam
4. Canna lily
5. Onion
6. Plantain
7. Banana
8. Ginger
9. Pineapple
10. Bryophyllum
11. Sugar cane
12. Cassava
13. Fern
14. Elephant grass
15. Tiger nuts
16. Garlic

(i)

Work is said to be done when the point of application of a force moves an object through a distance in the direction of the force.

OR

Work is said to be done when a force moves a body through a distance in the direction of the force.

OR

Work is the product of force and the distance moved in the direction of the force.

OR

Work = Force x distance moved in the direction of the force

(ii)

Power is the rate of doing work.

OR

Power is the rate at which energy is dissipated

OR

Power = $\frac{\mathrm{Work\; done}}{\mathrm{Time\; taken}}$

(i)

akpeteshie (alcohol) → Distillation

(ii)

common salt → Evaporation/crystallisation

(iii)

tap water → Filtration/sedimentation/coagulation

(i)

An ion is an electrically charged atom

OR

An ion is an atom or group of attoms which have lost or gain electron(s).

(ii)

Examples of ions

1. Potassium ion (K⁺)
2. Sodium ion (Na⁺)
3. Chlorine ion (Cl^-)
4. Magnesium ion (Mg²⁺)
5. Hydroxide ion (OH^-)
6. Sulphate ion (SO₄^2-)
7. Aluminum ion (Al³⁺)
8. Calcium ion (Ca²⁺)
8. Copper (I) ion (Cu⁺)
9. Copper (II) ion (Cu²⁺)
10. Hydrogen ion (H⁺)
11. Iron (II) ion (Fe²⁺)
12. Iron (III) ion (Fe³⁺)
13. Lead (II) ion (Pb²⁺)
14. Lithium ion (Li⁺)
15. Silver ion (Ag⁺)
16. Tin (II) ion (Sn²⁺)
17. Zinc ion (Zn²⁺)
18. Bromide ion (Br^-)
19. Fluoride ion (F^-)
20. Iodide ion (I^-)
21. Nitride ion (N^3-)
22. Oxide ion (O^2-)
23. Sulfide ion (S^2-)
24. Ammonium ion (NH₄⁺)
25. Carbonate ion (CO₃^2-)

(i)

Capillary action is the rise or fall of liquids in small/narrow tubes/columns as a result of adhesion and surface tension forces.

(ii)

Processes which use capillary action

1. Kerosene moving up the wick in a lamp
2. Water moving from the soil into roots of plants
3. Blotting of ink with blotting paper
4. A sponge absorbing water
5. Placing a straw into a glass of water

(i)

A lever is a simple machine which consists of a rigid bar/rod free to turn about a fixed turning point called the fulcrum/pivot.

(ii)

Examples of second class levers

1. Wheel barrow
2. Nut cracker
3. Bread knife
4. Bottle opener
5. Paper cutter
6. Staplers
7. Doors or gates
8. Nail clippers

(i)

Okro leaves → grasshopper → toad

OR

Okro leaves → grasshopper → man

OR

Cassava → rat → hawk

OR

Cassava → rat → man

(ii)

Ways of keeping the teeth healthy

1. Brushing of teeth/chewing stick/removal of food particles in between teeth
2. Avoid taking too much sweets
3. Avoid eating too hot or cold food
4. Visit the dentist regularly
5. Chew roughage to exercise teeth
6. Do not misuse teeth for example using it to open bottle tops
7. Avoid using sharp objects to remove particles in-between teeth
8. Take in food containing calcium/vitamins/phosphorous

(i)

Digestion of a morsel of kenkey in the mouth

1. The morsel of kenkey is chewed, mixed with saliva so that it can be easily swallowed
2. The ptyalin/enzyme in saliva acts on the starch present in the kenkey and changes it to maltose

(ii)

The parts of the digestive system of humans listed in order

Mouth → oesophagus/gullet → stomach → duodenum → ileum → colon → rectum → anus

(i)

The name of the compound formed

Iron sulphide/Iron (II) sulphide

(ii)

The chemical equation of the reaction

Fe + S → FeS

(iii)

Methods of preventing iron from rusting

1. Painting
2. Galvanization
3. Greasing/oiling/lubricating
4. Tin plating
5. Alloying
6. Plastic coating
7. Electroplating
8. Sacrificial protection/cathodic protection

(i)

Work done = Force x Distance

Force = 15 N
Distance = 5 m

Work done = 15 N x 5 m = 75 J

(ii)

(i)

Reasons which indicate that respiration and burning are similar processes

1. Both processes require oxygen/air to function
2. Both release energy whenever they occur
3. Both are chemical changes/involve the use of energy

(ii)

Cross-pollinationis the transfer of pollen grains from the anther of a flower to the stigma of another flower on another plant of the same species.

(iii)

Methods by which cholera can be controlled and prevented

1. Drinking of pure/boiled water
2. Burying/destroying/covering of excreta/faeces (of cholera patients)
3. Covering of food/keeping food in safes
4. Avoid eating raw vegetables or fruits which have not been washed properly
5. Eating hot foods or avoid eating cold foods
6. Washing hands after attending nature's call
7. Immunization/vaccination

(i)

Three coldest planets

1. Uranus
2. Neptune
3. Pluto

(ii)

The planets are cold because they are far away from the sun.

(iii)

Density = $\frac{\mathrm{Mass}}{\mathrm{Volume}}$

Mass = 150 g
Volume = 250 cm³

Density = $\frac{\mathrm{150\; g}}{250{\mathrm{cm}}^3}$

Density = 0.6 gcm^-3

(i)

Suitable solvents for grease

1. Kerosene
2. Petrol

(ii)

Suitable solvents for oil paint

1. Kerosene
2. Turpentine
3. Petrol

(iii)

Suitable solvent for alcohol

Water

(iv)

Suitable solvent for sugar

Water