Year 8 Term 2

Question 1

Where are carbohydrase found ?

Answer 1

Mouth, pancreas, small intestine

Question 2

Where are protease found ?

Answer 2

Stomach, pancreas, small intestine.

Question 3

Where are lipase found ?

Answer 3

Pancreas, small intestine.

Question 4

What is produced from carbohydrase ?

Answer 4

Sugar molecules

Question 5

What is produced from protease ?

Answer 5

Amino acids

Question 6

What is produced from lipase ?

Answer 6

Glycerol and fatty acids

Question 7

What happens in the gullet/oesophagos ?

Answer 7

Food passes down this tube

Question 8

What happens in the mouth ?

Answer 8

Food is chewed and mixed with saliva.

Question 9

What happens in the stomach ?

Answer 9

Food is mixed with digestive juices and acids.

Question 10

What happens in the large intestine ?

Answer 10

Water passes back into the body leaving feces.

Question 11

What happens in the small intestine ?

Answer 11

Digestion is completed and nutrients pass Ito the blood.

Question 12

What does Benedict solution test for ?

Answer 12

Sugar

Question 13

What does oil and water test for ?

Answer 13

Oil

Question 14

What does iodine test for ?

Answer 14

Starch

Question 15

What does biuret solution test for ?

Answer 15

Protein

Question 16

How do you turn a food into a colourless testable solution ?

Answer 16

Bring it with water and filter through muslin.

Question 17

What are the key nutrients in addition to water that we need are ?

Answer 17

Carbohydrates, protein, fats, fibre, minerals and vitamins.

Question 18

What type of diet do we need ?

Answer 18

A balanced/varied diet.

Question 19

What is the method of test for Benedict solution ?

Answer 19

Put sugar/solution and Benedict solution together in 90 degree water.

Question 20

What is the method of test for oil and water ?

Answer 20

Put one drop of oil and water on a piece of filter paper.

Question 21

What is the method of test for iodine ?

Answer 21

Starch/solution with 2 drops of iodine.

Question 22

What is the method of test for biuret ?

Answer 22

Add biuret to egg/ solution.

Question 23

What is a positive result of Benedict solution ?

Answer 23

Went from Blue to Brick red

Question 24

What is a positive result of oil and water ?

Answer 24

A greasy transparent mark will be left on paper from the oil.

Question 25

What is a positive result of iodine ?

Answer 25

Went from yellow to dark blue.

Question 26

What is a positive result of biuret ?

Answer 26

Went from blue to purple

Question 27

What is one negative effect on health of high sugar foods ?

Answer 27

It can lead to obesity

Question 28

When food is burned what is transferee to its surroundings ?

Answer 28

Energy

Question 29

What is the experiment to investigate the energy of food content ?

Answer 29

Burn food under a test tube of water with a thermometer and the higher temperature the higher energy in food.

Question 30

What is energy measured in ?

Answer 30

Joules, kilojoules or calories.

Question 31

What can excess sugar mean ?

Answer 31

You take in too much sugar meaning you become overweight or diabetes.

Question 32

What can excess fat lead to ?

Answer 32

Obesity

Question 33

Why is some fat essential ?

Answer 33

Production of new cells and the correct functioning of hormones.

Question 34

What is the name for the thing caused by lack of vitamins or minerals ?

Answer 34

Deficiency diseases

Question 35

What is a lack of Vitamin D called ?

Answer 35

Rickets

Question 36

What is a lack of Vitamin A called ?

Answer 36

Night blindness

Question 37

What is a lack of Iron called ?

Answer 37

Anaemia

Question 38

What is the experiment to prove that digestion is mainly a chemical process ?

Answer 38

Get ham, carrot, pepsin, Hydrochloric acid and water. Put them in test tubes and then leave them for a week after that see what had happened to the carrot and ham.

Question 39

What is evolution ?

Answer 39

It’s the scientific idea that all species on Earth have gradually developed over millions of years.

Question 40

What is a balanced diet ?

Answer 40

It has a variety of different types of foods and having the right amount of nutrients for good health.

Question 41

What is natural selection ?

Answer 41

Mechanism by which an organism better adapts to their environment.

Question 42

Which scientist proposed the theory of evolution ?

Answer 42

Charles Darwin

Question 43

What does evolution mean ?

Answer 43

The process by different kinds of living organism are believed to have developed from earlier forms in history.

Question 44

What’s the difference between extinct and endangered ?

Answer 44

Extinct is when an animal no longer exists and endangered is when there are still some left in the world.

Question 45

Create a simple evolutionary sequence

Answer 45

1.ammonite. 2.nautilus. 3.limpet. 4.snail. 5.slug

Question 46

What does peer review mean ?

Answer 46

Where a scientists work is checked by another scientist before being published.

Question 47

Name the process by which organisms evolve.

Answer 47

Natural selection

Question 48

What does biodiversity mean ?

Answer 48

A measure of the variety of organisms in the world.

Question 49

How can you protect endangered species ?

Answer 49

Conservation, captive breading and gene banks

Question 50

Describe the process of digestion .

Answer 50

Breakdown of large insoluble molecules into small soluble molecule, enzymes help to speed up digestion.

Question 51

Give a structured account of digestion

Answer 51

Starch is digested in mouth, Protein is digested in stomach, Starch, Protein and Fat is digested in Small intestine.

Question 52

Describe the role of enzymes .

Answer 52

they speed up digestion (breaking up large molecules into smaller ones) without being used up.

Question 53

Describe the role of bacteria in digestion

Answer 53

they help break down food and make important vitamins.