Science Revision

Question 1

What is the function of a flower.

Answer 1

Male-Stamen-The male reproductive part of flower
Anther- Produces pollen grains which develop sperm
Filament-Supports the Anther
Female-Pedel- The female reproductive part of flower
Stigma-Sticky pollen receptive part of pedal
Style-The stalk of the pedal down which the pollen tube grows
Ovary-Contains the Ovules and becomes a fruit.

Question 2

What is a physical change

Answer 2

A change that does not result in a new substance being formed

Question 3

What’s is a chemical change

Answer 3

A change that does result in a new substance being formed

Question 4

What is an atom

Answer 4

The smallest building blocks of matter

Question 5

What is matter made up of

Answer 5

Matter is made up of atoms

Question 6

Know the layers that form the Earth

Answer 6

Inner core- Earth’s innermost part. It is primarily a solid ball with a radius of about 1,220 kilometres, which is about 70% of the Moon’s radius. It is composed of an iron–nickel alloy and some other elements.
Outer Core- The outer core of the Earth is a fluid layer about 2,400 km thick and composed of mostly iron and nickel that lies above Earth’s solid inner core and below its mantle. Its outer boundary lies 2,890 km beneath Earth’s surface.
Mantle- The layer of the Earth between the crust and the core.
Crust- The crust is the outermost solid shell of a rocky planet, dwarf planet, or natural satellite. It is usually distinguished from the underlying mantle by its chemical makeup; however, in the case of icy satellites, it may be distinguished based on its phase.

Question 7

Know some chemical elements

Answer 7

Au- Gold, Ag- Silver, Pb- Lead, Sn- Tin, He- Helium, C- Carbon, O- Oxygen, Al- Aluminium, S-Sulfur, Br- Bromine, H- Hydrogen, Ca- Calcium, Fe- Iron, Ni- Nickel, Co- Colbalt, Cu- Copper,
Zn- Zinc, Hg- Mercury

Question 8

What is the oviduct

Answer 8

The through which an ovum or egg passed through from an ovary.

Question 9

What elements are found in our human body

Answer 9

The human body is mad up of 6 elements. These are oxygen (65%), carbon (18%), hydrogen (10%), nitrogen (3%), calcium (1.5%) and phosphorus (1%).

Question 10

How many days does it take for a fertilised egg to reach the womb

Answer 10

5-6 days

Question 11

What is the function of the anther in a flower

Answer 11

Produces pollen grains which develop sperm

Question 12

What is the function of the stigma in a flower

Answer 12

Sticky pollen receptive part of pedal

Question 13

Know a molecule

Answer 13

A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

Question 14

Know an element

Answer 14

Substances made up of only one type of atom

Question 15

Know what a lattice is

Answer 15

How metals are arranged in a structural format

Question 16

Properties of metals

Answer 16

• Tend to be shiny or can be polished to make them shiny. This is referred to as being lustrous
• Are solid at room temperature (except mercury, which is a liquid)
Are good conductors of heat and electricity. This means that they allow heat and electricity to flow easily through them.
Can be bent and hammered into sheets. This is referred to as being malleable .
Can be stretched into wires. This is referred to as being ductile.

Question 17

Properties of non-metals

Answer 17

• tend to be dull (not shiny).
do not conduct heat or electricity. Non-metals are insulators for electricity and heat.
break or crumble when you bend them. Non-metals are referred to as being brittle

Question 18

What is asexual reproduction

Answer 18

Reproduction that only involves one parent

Question 19

What are exothermic and endothermic reactions

Answer 19

Exothermic- When heat or light is given off in any given reaction.
Endothermic- When heat or light is absorbed in any given reaction.

Question 20

Properties of minerals

Answer 20

Hardness- Is assessed by comparing minerals using Mohs scale. This is used to find what can scratch an unknown mineral, and which mineral can be scratched by the unknown mineral.
Lustre- Is how shiny a mineral is. Lustre can be useful when you are out prospecting for minerals. Lustre divides different minerals into categories according to their shine. Some common lustres are adamantine (sparkles like diamonds), pearly (glows like pearl), greasy (looks like oil or grease) and silky (like silk).
Colour- Colour is very useful when searching for minerals. For example, gold shows up as a yellowish colour in rock and soil.
Streak Colour- Streak is the colour left behind when you try to scratch an unglazed white tile with the mineral. The streak is often different from the colour of the mineral itself.
Flame Colour- Flame tests are chemical tests that provide another way of identifying a mineral. In these tests, minerals are first ground into powders or dissolved. Some of the powdered or dissolved mineral is then put into a hot flame. The mineral glows and gives the flame a characteristic colour that may then be used to identify the mineral