Y9

Question 1

What are the raw materials needed for photosynthesis?

Answer 1

Carbon dioxide and water

Question 2

Where in the cell does photosynthesis occur?

Answer 2

In the chloroplasts

Question 3

What is the main product of photosynthesis?

Answer 3

Glucose

Question 4

What is the by-product of photosynthesis?

Answer 4

Oxygen

Question 5

What gas is taken in during photosynthesis?

Answer 5

Carbon dioxide

Question 6

What is the role of chlorophyll in photosynthesis?

Answer 6

It absorbs light energy

Question 7

What is the word equation for photosynthesis?

Answer 7

Carbon dioxide + water → glucose + oxygen

Question 8

What process in animals and plants adds carbon dioxide to the air?

Answer 8

Respiration

Question 9

What process removes carbon dioxide from the air?

Answer 9

Photosynthesis

Question 10

Name two human activities that increase carbon dioxide levels.

Answer 10

Combustion and deforestation

Question 11

What is the difference between an element and a compound?

Answer 11

Elements have one type of atom; compounds have two or more chemically combined

Question 12

What is a mixture?

Answer 12

Two or more substances not chemically combined

Question 13

What method is used to separate soluble solids from liquids?

Answer 13

Evaporation or Distillation

Question 14

Which method separates substances based on boiling points?

Answer 14

Distillation

Question 15

What is the name of the technique used to separate ink colours?

Answer 15

Chromatography

Question 16

What are the three main states of matter?

Answer 16

Solid, liquid, gas

Question 17

What is the particle arrangement in a solid?

Answer 17

Tightly packed in fixed positions

Question 18

What causes a substance to change state?

Answer 18

Adding or removing heat

Question 19

What is diffusion?

Answer 19

The movement of particles from a high to low concentration

Question 20

What is force measured in?

Answer 20

Newtons (N)

Question 21

What device is used to measure force?

Answer 21

A newton meter

Question 22

What is gravity?

Answer 22

A force that pulls objects towards the Earth

Question 23

What causes friction?

Answer 23

Contact between surfaces

Question 24

What is air resistance?

Answer 24

A type of friction acting against objects moving in air

Question 25

What is the difference between mass and weight?

Answer 25

Mass is the amount of matter; weight is the force of gravity on it

Question 26

What is energy measured in?

Answer 26

Joules (J)

Question 27

What is the energy in moving objects called?

Answer 27

Kinetic energy

Question 28

What energy is stored in raised objects?

Answer 28

Gravitational potential energy

Question 29

What is thermal energy?

Answer 29

Energy stored in warm or hot objects

Question 30

What is respiration?

Answer 30

A process that releases energy from glucose

Question 31

Where does respiration happen in cells?

Answer 31

Mitochondria

Question 32

What is the word equation for aerobic respiration?

Answer 32

Glucose + oxygen → carbon dioxide + water

Question 33

What is the function of the lungs?

Answer 33

To exchange gases between air and blood

Question 34

What happens to your breathing during exercise?

Answer 34

It becomes faster and deeper

Question 35

What is the main function of red blood cells?

Answer 35

To carry oxygen

Question 36

What is the role of white blood cells?

Answer 36

To fight infections

Question 37

What is the function of the heart?

Answer 37

To pump blood around the body

Question 38

What type of blood vessel carries blood away from the heart?

Answer 38

Artery

Question 39

What type of blood vessel allows exchange of gases and nutrients?

Answer 39

Capillary

Question 40

What is the reactivity series?

Answer 40

A list of metals ranked by how reactive they are

Question 41

Which metals react quickly with acids?

Answer 41

Alkali Metals

Question 42

What gas is produced when metals react with acid?

Answer 42

Hydrogen

Question 43

How can you test for hydrogen gas?

Answer 43

With a lit splint – it makes a squeaky pop

Question 44

What is displacement in chemistry?

Answer 44

A more reactive metal replaces a less reactive one from its compound

Question 45

Why is gold found as a pure metal in nature?

Answer 45

Because it is very unreactive

Question 46

What is corrosion?

Answer 46

The breakdown of metals due to chemical reactions

Question 47

What is rusting?

Answer 47

The corrosion of iron

Question 48

How can rusting be prevented?

Answer 48

Painting, oiling, or galvanising

Question 49

What is the product when iron reacts with oxygen and water?

Answer 49

Iron oxide (rust)

Question 50

What is the purpose of waxy layer in a leaf?

Answer 50

Prevent leaf cells from drying out

Question 51

What is the purpose of the upper and lower epidermis?

Answer 51

Protect the cells in the leaf

Question 52

What is the purpose of vein in a leaf?

Answer 52

Transport water to cells in the leaf

Question 53

What is the purpose of the spongy layer?

Answer 53

have air pockets to facilitates the exchange of gases essential to photosynthesis

Question 54

What is the purpose for palisade layer?

Answer 54

Contains cells that do most of the photosynthesis

Question 55

What is the purpose of stoma/stomata?

Answer 55

A hole in lower epidermis, allow gas exchange

Question 56

Factors of photosynthesis

Answer 56

Carbon dioxide, Light, Light intensity, Minerals, Chlorophyll, Water availability, Temperature

Question 57

What colour does a leaf turn to if it contains starch?

Answer 57

Blue-Black

Question 58

What colour does a leaf turn to if it DOES NOT contains starch?

Answer 58

Brown

Question 59

What is the purpose of Magnesium in fertilizer?

Answer 59

Produces chlorophyll

Question 60

What is the purpose of Nitrate in fertilizer

Answer 60

Convert carbohydrates into proteins