Life Processes

Question 1

Write the word equation for aerobic respiration

Answer 1

glucose + oxygen -> carbon dioxide + water + (energy)

Question 2

From which system does the body obtain glucose for respiration?

Answer 2

The digestive system

Question 3

In which part of our cells does respiration mainly occur?

Answer 3

In the mitochondria

Question 4

What are the products of respiration?

Answer 4

Carbon dioxide, water

Question 5

How do we test for carbon dioxide?

Answer 5

Bubble through limewater; the limewater turns cloudy.

Question 6

The word “aerobic” indicates the presence of which gas?

Answer 6

oxygen

Question 7

Which unit is energy usually measured in?

Answer 7

joules, J

Question 8

How many joules are there in 1 kilojoule?

Answer 8

1000J

Question 9

What is the symbol for kilojoule?

Answer 9

kJ (lower case k, capital J)

Question 10

If a food is high in energy, which nutrient/s is it likely to contain?

Answer 10

Lipids/fats, carbohydrates

Question 11

List the 7 nutrients needed by the human body

Answer 11

carbohydrates, proteins, lipids, vitamins, minerals, water, fibre

Question 12

Foods high in which group help repair muscles?

Answer 12

Protein

Question 13

Why is fibre needed in our diet?

Answer 13

Add bulk to food to help it pass through the digestive system; prevents constipation

Question 14

Scurvy can occur when we don’t get enough of which vitamin?

Answer 14

Vitamin C

Question 15

Give 2 sources of vitamin C

Answer 15

fruit and veg

Question 16

Rice, potato and bread are good sources of

Answer 16

carbohydrates

Question 17

Meat, fish and nuts are good sources of

Answer 17

protein

Question 18

Sugar and starch are both types of

Answer 18

carbohydrate

Question 19

Which test do we use to detect for the presence of starch?

Answer 19

iodine

Question 20

When testing for starch what colour change indicates a positive result?

Answer 20

Brown to black

Question 21

Which test do we use to detect for the presence of sugar?

Answer 21

benedicts

Question 22

When testing for sugar what colour change indicates a positive result?

Answer 22

blue to red

Question 23

Which test do we use to detect for the presence of protein?

Answer 23

biuret

Question 24

When testing for protein what colour change indicates a positive result?

Answer 24

Blue to purple

Question 25

When testing for fats what change indicates a positive result?

Answer 25

cloudy emulsion formed

Question 26

Which test do we use to detect for the presence of fats?

Answer 26

ethanol

Question 27

What is digestion?

Answer 27

The process of breaking down food into substances our body can absorb and use

Question 28

Where does mechanical digestion mainly occur?

Answer 28

In the mouth

Question 29

List the organs the food will travel through on its way through the digestive system

Answer 29

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

Question 30

Which nutrient starts to be chemically digested in the mouth?

Answer 30

Carbohydrate