(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)

The three states of matter

Solid, liquid and gas.

(ii)

Methods by which one state can be converted to another

1. Melting
2. Boiling
3. Evaporation
4. Freezing
5. Condensation
6. Sublimation

(i)

Labelled parts of the side view of a body fish

(ii)

How the fish takes in oxygen

1. Water enters the mouth and passes over the gills
2. The blood in the gills absorbs the oxygen dissolved in the water

(iii)

i)

Photosynthesis is the process by which green plant produces their own food/carbohydrate/glucose/starch using carbon dioxide and water with the presence of sunlight and chlorophyll.

ii)

Importance of digestive system

It breaks down food so that it can be used by the body for energy/cell growth or repair

i)

Systematic Names

ii)

Element is a simple substance that cannot be broken down into smaller parts or changed into another substance or a substance whose atoms are of the same kind

iii)

The name given to a solid mixture is an alloy

i)

Hormones are chemical substances produced by special endocrine/ductless glands in the body to enable certain organs function properly.

ii)

i)

2NH₄Cl + Ca(OH)₂ → CaCl₂ + 2NH₃(g) + 2H₂O

ii)

How to test for ammonia gas

1. Ammonia turns moist red litmus paper blue
2. Ammonia produces white fumes when it reacts with concentrated hydrochloric acid (HCl)

iii)

Uses of ammonia

1. For preparation of ammonium nitrate/fertilizers
2. Used in the textile industry
3. Used as a laboratory reagent

i)

Types of forces

1. Force of gravity
2. Weight
3. Magnetic force
4. Electrostatic force
5. Frictional force
6. Centripetal force
7. Viscous force
8. Tensional/Elastic force
9. Adhesion
10. Cohesion
11. Centrifugal force

ii)

1. Tensional/Elastic force
2. Force of gravity
3. Frictional force

(i)

Bedwetting is the unconscious release of urine while asleep.

(ii)

Diseases that may result from bedwetting

1. Skin rashes
2. Yaws
3. Eczema
4. Sores

(i)

Hard water is water that does not lather easily with soap while impure water contains other dissolved substances/foreign materials/bacteria and not good for human consumption.

(ii)

Stages involved in the treatment of water for a community

1. Filtration by passing water through gravel beds
2. Sedimentation by adding alum
3. Chlorination by adding chlorine (to kill germs)
4. Aeration by exposing water to air to remove odour/improve taste
5. Storage and/or distribution

(i)

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

Volume = Final volume - Initial volume

Volume = 90 cm³ - 60 cm³
Volume = 30.0 cm³

Density = $\frac{\mathrm{36.0\; g}}{30.0{cm}^3}$

Density = 1.2 gcm^-3

(ii)

The stone will float in the liquid because the density of the stone is less than that of the liquid.

i)

Female sexual characteristics of a human being

1. Vagina
2. Ovaries
3. Womb/uterus
4. Fallopian tubes
5. Cervix
6. Vulva
7. Breast

ii)

Sense organs in mammals

1. Eyes
2. Ears
3. Nose
4. Tongue
5. Skin

iii)

Function of the sense organs

1. Eyes → for sight
2. Ears → for hearing
3. Nose → for smelling
4. Tongue → for tasting
5. Skin → for feeling and excreting sweat

i)

A compound is the substance formed as a result of the chemical combination of two or more elements.

OR

A compound is a substance which is made up of two or more elements chemically combined.

ii)

A mixture is what is formed when two or more substances are combined physically

OR

A mixture is the substance formed as a result of the physical combination of two or more substances which can be separated by physical means.

i)

An orange falls from a tree to the ground

Potential energy → Kinetic energy → Sound energy + Heat energy

ii)

A carpenter hits a nail with a raised hammer

Potential energy → Kinetic energy → Sound energy + Heat energy