i)

Functions of nucleus

1. Controls life activities of cells
2. Controls cell reproduction/division
3. Contains heredity units (called genes)

ii)

Functions of chloroplast

1. Contains chlorophyll
2. Absorbs light energy
3. For photosynthesis

iii)

Functions of mitochondrion

For the production of energy/serves as site for respiration

(i)

Condensation is the change from the gas state to the liquid state.

(ii)

Freezing is the change from the liquid state to the solid state.

i)

Differences between plants and animals

ii)

Similarities between plants and animals

1. They are made up of cells
2. They feed
3. They respire
4. They move
5. They are sensitive to stimuli
6. They reproduce
7. They excrete
8. They grow

(a)

Living cell is the smallest basic unit of a plant or animal/living organism

(b)

(c)

Arrangement of molecules in a solid

Arrangement of molecules in a liquid

Arrangement of molecules in a gas

i)

Why gases are more compressible than solids

The particles/molecules of gases are far apart whereas in solids they are more compact.

ii)

Areas where the compressible nature of a gas is applied

1. Pumping of lorry tyres/football
2. Putting gas in bottled minerals
3. Blowing of balloons
4. Putting gas in bottles/gas cylinders

(i)

Observable features of an animal cell

1. Mitochondrion
2. Cytoplasm
3. Nuclear membrane
4. Lysosome
5. Irregular shape

(ii)

Functions of a nerve cell

1. Release chemical regulators
2. Respond to physical and chemical stimuli
3. Transmits electrical impulses/messages

(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)

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)

Unicellular is a living organism that consists of only once cell.

ii)

Multicellular, living organisms that consist of many cells.

i)

Matter is anything that has mass/weight and can occupy space.

ii)

States of matter

1. Solid
2. Liquid
3. Gas
4. Plasma

i)

ash → solid

ii)

carbon dioxide → gas