End Of Year Exams Yr 8

Question 1

Ecosystem

Answer 1

The interaction between plants, animals and their habitat in a particular location

Question 2

Community

Answer 2

The collection of the different types of organisms present in an ecosystem

Question 3

Habitat

Answer 3

The area of land where organisms live and it has all the resources that an organism needs to live

Question 4

Niche

Answer 4

A particular place or role that an organisms has in an ecosystem

Question 5

What is protein needed for

Answer 5

Growth and repair

Question 6

What is needed for warmth and insulation and energy

Answer 6

Lipids

Question 7

What is carbohydrates

Answer 7

They are needed for energy

Question 8

Vitamins are needed for ….

Answer 8

Preventing deficiency diseases

Question 9

What are minerals used for

Answer 9

Key chemicals in your body

Question 10

What happens if you lack vitamin D ?

Answer 10

Rickets

Question 11

What happens if you lack vitamin C

Answer 11

Scurvy

Question 12

What happens if you lack calcium

Answer 12

Bone and tooth decay

Question 13

What is bile?

Answer 13

Bile is made in the liver and stored in the gall bladder it helps to break down stomach acid and emulsify lipids

Question 14

Why does the small intestine have a large surface area?

Answer 14

This is because of the villi, they provide a large surface area for maximum absorption of nutrients into the blood stream

Question 15

What does smoking do to you

Answer 15

It damages your lungs with tar and weakens the alveoli which leads to ling cancer

Question 16

What can smoking do to your heart?

Answer 16

It can block arteries which can cause death

Question 17

What does carbon monoxide do in a cigarette

Answer 17

It stops the blood from carrying oxygen, instead it clings to them

Question 18

What does a depressant do

Answer 18

It slows down your reaction time and relaxes you, an example is alcohol

Question 19

What does a stimulant do

Answer 19

It helps your reaction time and keeps you awake, an example it coffee or cocaine

Question 20

What do hallucinogens do

Answer 20

They make you hear, see and think things that aren’t really there, an example is marijuana or LSD

Question 21

What do pain killers do

Answer 21

They help stop or relieve pain from someone, an example is heroine and aspirin

Question 22

What do enzymes do

Answer 22

Enzymes are special molecules that break down large molecules of nutrients into smaller ones so they can be digested more easily

Question 23

Explain the journey that food takes from the mouth to the anus

Answer 23

Mouth, oesophagus, stomach, small intestine, large intestine, rectum, anus

Question 24

What is the rectum

Answer 24

The last place where the faeces is stored

Question 25

What happens in the large intestine

Answer 25

Only the food that cannot be digested is here, all the water is removed and goes back into the body leaving a solid lump of food called faeces

Question 26

What happens in the stomach

Answer 26

The food mixes with digestive juices and hydrochloric acid

Question 27

What happens in the oesophagus

Answer 27

Food is pushed through the gullet by contracting muscles

Question 28

What is protease

Answer 28

Protease is an enzyme that breaks down protein into amino acids, this happens in the stomach and small intestine

Question 29

What is carbohydrase

Answer 29

It is the enzyme that breaks down carbohydrates into sugar molecules called glucose, this happens in the mouth, stomach and small intestine

Question 30

What is lipase

Answer 30

Lipase breaks down lipids ( fat ) into fatty acids and glycerol, this happens in the small intestine and is helped by bile

Question 31

What is the reactivity series

Answer 31

``` Polite- potassium Spotted- sodium Leopards- lithium Can- calcium Meet- magnesium Affectionate- aluminium Zebras- zinc Into- iron Tender- tin Loving- lead Care- copper Single- silver Girls- gold Please- platinum ```

Question 32

What classes a metal as a metal?

Answer 32

Is it a good conductor of heat and electricity, shiny, solid at room temperature (expect mercury), density, strong but maleable, can they be magnetic, they ring when hit

Question 33

Whats the definition of an element?

Answer 33

Ask mrs

Question 34

Why do plants need nitrates?

Answer 34

Nitrates help growth and repair and without then plants have poor growth, weak stem and upper leafs pail

Question 35

Why is phosphates needed in plants?

Answer 35

Respiration and making roots as well as stoping the plant turning purple

Question 36

How does potassium effect plants?

Answer 36

Needed for respiration and photosynthesis and leaves with yellow spots

Question 37

Magnesium deficiency

Answer 37

Help make chlorofiel without yellow leafs

Question 38

What does co - exist mean

Answer 38

Animals that live together

Question 39

What do the guard cells do

Answer 39

Open and close the stomata

Question 40

What do the cells in the palisade layer do

Answer 40

They are the main site of photosynthesis

Question 41

What does the waxy layer do

Answer 41

It reduces the amount of water evaporated

Question 42

What does the stomata do

Answer 42

Open to absorb sunlight but close if water levels are low