i)

Identification of labelled parts

I → womb(wall)/uterus
II → fallopian tube/oviduct
V → ovary
VI → vas deferens/sperm duct
VII → penis
VIII → testis

ii)

Function of III(Cervix)

Contracts/relaxes during child birth/protects foetus

Function of IV(Vagina)

1. Receives the penis/semen/sperm during sexual intercourse/for sexual intercourse
2. Passage of foetus
3. Passage of menstrual fluid

Function of VII(Penis)

Passage of sperm/semen/for sexual intercourse

iii)

Name of part where

iv)

Common infectious diseases that affect both the male and female reproductive system

1. Syphilis
2. Herpes (simplex virus)
3. Chancroid
4. Chlamydia
5. Gonorrhea/gonorrhoea
6. Candidiasis/whites/thrush

i)

Common name of devices

Garden/farm tools/farm implements/farming tool

ii)

Name of labelled devices

A → Mattock
B → Peg
C → Hand fork

iii)

Uses of A (Mattock)

1. Removing of stump roots/for stumping
2. Cutting off exposed plant roots

Use of B (Peg)

For making spots on land (for correct spacing of plants)

Uses of C (Hand fork)

1. For removing weeds on garden beds
2. To loosen hard soil surface/for stirring
3. For mixing fertilizers around plants

iv)

Effects of the use of the device C (Hand fork) on the soil

1. Improves aeration
2. Improves water entry/circulation in soil
3. Improves structure of soil

v)

Ways of prolonging the usefulness of the device labelled A (Mattock)

1. Clean tool after use
2. Use it for the right work/purpose
3. Repair broken handle
4. Keep in a cool dry place
5. Oil metallic part before storage
6. Sharpen cutting edges
7. Ensure metallic blade is tightly fitted to wooden handle
8. Keeping tools in termite free area

i)

Symbols of electronic components

ii)

Circuit diagram showing forward biasing

iii)

Effects of resistor on diode and LED

Resistor limits current in the circuit and thereby protects diode and LED from burning off.

i)

Observations made in laboratory activities

ii)

Suggested aim for the experiment

1. To demonstrate the method of preparation of mixtures
2. To determine whether a homogeneous mixture/solution or heterogeneous mixture/solution would be formed
3. To prepare a mixture/solution
4. To determine if the solute will dissolve/mix with the solvent/water to form a solution/mixture

iii)

Differences between activity I and III

iv)

Method of separation for the activity carried out in II

Use of separating funnel

i)

Importance of a fuse in an electrical appliance

1. To protect electrical equipment from excessive current
2. It is used as safety measures to prevent any hazards to humans

ii)

Household appliances that have fuse

1. Lamps
2. Televisions
3. Wall socket
4. Computers
5. Kettle
6. Dishwasher
7. Fridges/freezers
8. Electric fan
9. Electric iron/iron
10. Microwave

i)

Teenage pregnancy is when a girl under age 20 conceives/takes seed.

OR

Teenage pregnancy is when female/girls under the age of 20 get pregnant.

OR

Teenage pregnancy is when a female/girl under the age of 20 engages in sexual activity and becomes pregnant either intentionally or unintentionall.

ii)

Causes of teenage pregnancy

1. Poverty
2. Single parenthood
3. Rape
4. Peer pressure, etc.

i)

Practices that destroy waterbodies

1. Deforestation/clearing vegetation along the river banks
2. Bush burning
3. Farming near water bodies
4. Galamsey/surface mining activities
5. Dumping of solid/liquid waste into water bodies
6. Use of chemicals for fishing
7. Excessive use of chemical fertilizers
8. Defecation into water bodies, etc.

ii)

Methods of conserving water bodies

1. Use of organic materials for composting
2. Use of appropriate methods of fishing
3. Education on effects of galamsey activities
4. Education on defecation into water bodies
5. Use of erosion-control methods in farming
6. Afforestation, etc.

i)

Aerobic respiration is the process of cellular respiration that takes place in the presence of oxygen gas to produce energy from food.

OR

Aerobic respiration is the breakdown/oxidation of organic food substance/glucose in the presence of oxygen to release large amount of energy, water and carbon dioxide as by-products.

ii)

Aerobic respiration requires oxygen while anaerobic respiration does not require oxygen.

OR

In aerobic respiration oxygen is used while in anaerobic respiration oxygen is not used.

i)

Potential difference also known as voltage, is the external work needed to bring a charge from one location to another location in an electric field.

OR

Is the work done in moving a unit of positive electric charge from one point to another.

ii)

Potential Difference (V) = Current x Resistance

V = IR
Where V = potential difference, I = current and R = resistance

Potential difference = 250 V
Resistance = 100 Ω

250 = I x 100

Divide both sides by 100 to solve for I.

I = $\frac{250}{100}$ = 2.5 A

The current flowing through the resistor is 2.5 A

i)

Cocoa

ii)

Causative organism of the swollen shoot disease

Virus/Cacoa swollen shoot virus

iii)

Method of spread of the swollen shoot disease

Virus transmitted by nymphs of mealy bugs from infected plant to healthy plants.

iv)

Ways of preventing the spread swollen shoot disease

1. Destroy infected trees
2. Regular inspection of seedlings/planting materials
3. Use of quarantine/cordin sanitaire (leaving 10m wide cocoa free zone around area
4. Barrier cropping
5. Using partly tolerant hybrids/using resistant varieties
6. Removing host free species

i)

Electronic configuration for Y = 2:7

ii)

X⁺/L⁺

Note: The ion formed is cation. It can lose the one electron in its last shell to be make it more stable with only two electrons.

i)

Power is the rate of doing work

OR

Power is the rate at which work is done/energy is used

OR

Power is energy used up/work done per unit time.

OR

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

ii)

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

Work done = Force x Distance
Force = Mass x Acceleration due to gravity

Mass of the packing case = 50 kg
Acceleration due to gravity = 10 m^-2

Force = 50 kg x 10 m^-2 = 500 N

Distance = 10 m

Work done = 500 N x 10 m = 5000 J

OR

Work done = potential energy = Mass x Acceleration due to gravity x Height (mgh)

Work done = 50 x 10 x 10 = 5000 J

Time = 30 s

Power = $\frac{\mathrm{5000\; J}}{\mathrm{30\; s}}$ = 166.67 W/166.7 W

i)

The two elements that combines to form ammonia gas

1. Nitrogen
2. Hydrogen

ii)

Balanced chemical equation for the formation of ammonia

N₂ + 3H₂ → 2NH₃

i)

Galaxy is a group of stars.

OR

Galaxy is a system of stars,gases,dust/dark matter held together in the heavens/space.

OR

Galaxy is a collection of billions of stars that show a common gravitational link.

ii)

Relationship between stars and galaxies

Galaxies are held together by gravitational attraction much like a solar system while stars in the solar systems combine to form galaxies

OR

Stars makes up the galaxies

OR

Galaxies are made up of several billions of Stars

iii)

Milky way is the galaxy that contains the solar system and the earth.

OR

Milky way is a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye.

i)

Effects of soil erosion on the growth of crop plants

1. Loss of soil nutrients or nutrient imbalance or poor crop growth or yield
2. Destruction/death of crops
3. Increased cost of production or high doses of fertilizer needed to replenish soil
4. It is difficult to move farm machinery due to gullies
5. It causes siltation of dams or irrigation channels
6. Degradation of soil structure
7. Loss of rooting depth
8. Poor/stunted growth
9. Shows deficiency disease
10. Lodging of crop plants

ii)

Method of controlling soil erosion

1. Terracing
2. Strip cropping
3. Contour ploughing
4. Wind breaks/afforestation/planting
5. Mulching
6. Cover cropping
7. Crop rotation
8. Application of ogranic manure
9. Minimum/zero tillage
10. Afforestation

i)

Science related businesses

1. Blacksmithing
2. Gari processing
3. Soap making
4. Salt production
5. Kenkety production
6. Biogas production
7. Fish smoking

ii)

State the principles underlying the operation of each of the businesses named

1. Blacksmithing → forging/shrinking/bonding/malleability
2. Gari processing → fermentation
3. Soap making → saponification
4. Salt production → evaporation
5. Kenkety production → fermentation
6. Biogas production → decomposition
7. Fish smoking → dehydration/drying

i)

How the female Anopheles mosquito transmits malaria to humans

1. It bites an infected person, takes in blood infected with the malaria parasite
2. The parasite grows and matures in the mosquito's gut, then travels to the salivary glands
3. When the mosquito bites another person, it releases the parasites into the victim's body

ii)

Chemical method of controlling mosquitoes

1. Adding oil/kerosene on surface of stagnant water
2. Spraying with insecticide
3. Using treated mosquito nets
4. Use of mosquito coil

i)

Fundamental units of measurement

1. Metre
2. Second
3. Kilogram
4. Degree celcius/kelvin

ii)

Physical quantity that the units named in (i) measures

1. Metre → length
2. Second → time
3. Kilogram → mass
4. Degree celcius/kelvin → temperature