(i)

A vector is an agent/organism that transmits/spreads disease causing organisms/pathogens from diseased organisms to healthy ones.

(ii)

(i)

Systematic name of CaCo₃

Calcium trioxocarbonate (IV)

(ii)

Systematic name of FeS

Iron (II) sulphide

(iii)

Systematic name of NaCl

Sodium chloride

(iv)

Systematic name of NaOH

Sodium hydroxide

(i)

Properties that are common to all states of matter

1. Matter occupies space/has volume
2. Matter has weight/mass

(ii)

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

Mass = 60 g

Volume = Final Volume - Initial Volume

Volume = 75 cm³ - 60 cm³
Volume = 15 cm³

Density = $\frac{\mathrm{60\; g}}{\mathrm{15 }{\mathrm{cm}}^3}$

Density = 4 gcm^-3

i)

Properties of water

1. Made up of hydrogen and oxygen
2. Tasteless/insipid
3. Odourless
4. Boils at 100^oC
5. Density: 1,000 kg/m³ or 1g/cm³
6. Colourless
7. Freezes at 0^oC
8. A universal solvent
9. Neutral/pH 7
10. Exist as solid/liquid/gas
11. Polar
12. Expands anomalously/irregularly

ii)

Why clothes are washed with soft water

1. Use less soap
2. Clothes remain soft
3. Will be able to completely rinse the soap out of the clothes
4. Clothes keep their colour/brightness

(i)

The gas which is used in both rusting and burning is oxygen

(ii)

Ways in which rusting can be prevented in everyday life

1. Painting
2. Galvanizing (electroplating)
3. Greasing
4. Oiling
5. Alloying

(i)

Green grass → grasshopper → bird

OR

Green grass → goat → man

(ii)

Diseases that can be controlled by immunization

1. Tuberculosis
2. Measles
3. Poliomyelitis
4. Whooping cough
5. Diphtheria
6. Tetanus
7. Yellow fever
8. Cholera

(i)

Potential energy → Kinetic energy → Sound energy → Heat energy

(ii)

Appliances which use electromagnets in their operation

1. Telephone receivers
2. Loudspeakers
3. Electric bells
4. Burglar alarms
5. Microphones

(iii)

Ways in which a magnet can lose its magnetism

1. Heating the magnet in fire
2. Striking the magnet continuously with a hammer
3. Placing it in a solenoid through which an alternating current flows

(i)

Reactions between:

(ii)

Hazard that could be prevented when protective materials are used in the laboratory

(i)

Area of a cuboid = Length x Breadth

Area = 5 cm x 10 cm = 50 cm²

(ii)

Pressure = $\frac{\mathrm{100\; N}}{\mathrm{50\; }{\mathrm{cm}}^2}$ = 2 Ncm^-2

(i)

Mixed farming is the growing of crops as well as livestock, animal husbandry,etc all on same farm or land at the same time.

(ii)

Advantages of mixed farming

1. Animal droppings are used as manure for cultivating crops
2. Crops residue is used to feed the animals
3. Land is effectively used
4. Labour is effectively used throughout the year
5. Animals may provide power on the farm
6. Reduces risk of losing everything when diseases strikes or bad weather
7. Brings reliable sources of income
8. Reduces dependency on external inputs and costs
9. It enhances the productivity of the farmland

i)

Use of rain gauge

It imeasures the amount of rainfall

ii)

Use of hygrometer

It measures humidity/relative humidity

iii)

Use of anemomoter

It measures wind speed.

i)

Types of transistors

1. NPN transistor
2. PNP transistor

ii)

Circuit symbols of NPN transistor

Circuit symbols of PNP transistor

i)

The stone displayed water

OR

The stone occupied space

OR

The volume of the stone was added to the water

ii)

The cork would float

OR

The stone acts as a sinker

iii)

The cork will move up again

OR

The cork will float

iv)

Volume = Final Volume - Initial Volume

v)

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

Density of cork = $\frac{\mathrm{Mass\; of\; cork}}{\mathrm{Volume\; of\; cork}}$

Mass of cork = 4 g

Volume of cork = 2 cm³

Density of cork = $\frac{\mathrm{4\; g}}{2{\mathrm{cm}}^3}$

Density of cork = 2 gcm^-3

vi)

To avoid splashing/spilling of water

i)

I → Volumetric flask
II → Beaker
III → Funnel
IV → Stirring rod/Stirrer
V → Wash bottle

ii)

I → Used to prepare standard solution or prepare solution of known/given volume

II → Used to dissolve the solute/It could also be used to hold solution.

III → Transfer liquid/solution into the flask

IV → To stir or mix the solution

V → The water it contains is used to top solutions up to required level without exceeding the level/It can be used to wash solution stuck to containers for effective titration experiments

i)

I → Terminal bud II → Flower III → Leaf IV → Leaf stalk/petiole/node V → Stem VI → Root

ii)

Functions of I (Terminal bud)

1. Protects the growing regions
2. Develops into flower

Functions of II (Flower)

1. For reproduction
2. Fruit formation
3. For pollination

Functions of III (Leaf)

1. For photosynthesis/absorption of sunlight
2. For transpiration
3. For exchange of gases between the atmosphere and the plant

Functions of V (Stem)

1. Holds leaves/flowers to perform their functions
2. Transports/conducts water to parts of plant
3. For Storage of food

Functions of VI (Root)

1. Absorption of nutrients/water from the soil
2. Holds/Anchors plant firmly in the soil
3. Stores excess food in some plants

iii)

Main parts of a flowering plant

Shoot (system)
Root (system)

i)

Rabbit

ii)

I → Ear/Pinna
II → Cleft lip
III → Belly
IV → Hind limb
V → Tail
VI → Rump

iii)

Hutch

iv)

Breeds of rabbit

1. Dutch
2. Chinchilla
3 Rose
4. English
5. Beveren
6. Belgian
7. New Zealand
8. Chin Ginganta
9. Flenish Giant
10. Polish
11. New Zealand Red
12. Angora
13. California White
14. Florida White
15. Havana
16. Lilac
17. Lop
18. Rex
19. Spanish (Giant)
20. Continental Giant
21. Cinnamon
22. Silver

v)

Management practices to be adopted in order to control diseases and pests in the rearing of rabbit

1. Regular vertinary services
2. Provide good drinking water
3. The hutch should be cleaned regularly
4. The feeder should be washed
5. Disinfectant should be used
6. Dry feed should be given to the animal
7. Recommended pesticides should be used to control pests
8. Separate/isolate sick animals from healthy ones