Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Year 8 24/25 > Science - Life Processes > Flashcards

Science - Life Processes Flashcards

1
Q

Write the word equation for aerobic respiration

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

From which system does the body obtain glucose for respiration?

A

The digestive system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

In which part of our cells does respiration mainly occur?

A

In the mitochondria

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are the products of respiration?

A

Carbon dioxide, water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How do we test for carbon dioxide?

A

Bubble through limewater; the limewater turns cloudy.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

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

A

Oxygen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Which unit is energy usually measured in?

A

joules, J

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How many joules are there in 1 kilojoule?

A

1000J

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the symbol for kilojoule?

A

kJ (lower case k, capital J)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

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

A

Lipids/fats, carbohydrates

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

List the 7 nutrients needed by the human body

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Foods high in which group help repair muscles?

A

Protein

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Give 2 sources of vitamin C

A

Fruit and vegetables

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Why is fibre needed in our diet?

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

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

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Rice, potato and bread are good sources of

A

Carbohydrates

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Sugar and starch are both types of

A

Carbohydrate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Meat, fish and nuts are good sources of

A

Protein

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

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

A

Iodine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

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

A

Brown to black

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

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

A

Benedicts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

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

A

Blue to red

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

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

A

Biuret

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

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

A

Blue to purple

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Which test do we use to detect for the presence of fats?
Ethanol
26
When testing for fats what change indicates a positive result?
Cloudy emulsion formed
26
Where does mechanical digestion mainly occur?
In the mouth
27
What is digestion?
The process of breaking down food into substances our body can absorb and use
28
List the organs the food will travel through on its way through the digestive system
Mouth, oesophogus, stomach, small intestine, large intestine, rectum, anus
29
Which nutrient starts to be chemically digested in the mouth?
Carbohydrate
30
Where does digestion of lipids take place?
Small intestine
30
Where does digestion of protein take place?
Stomach, small intestine
31
Which organ produces carbohydrase, protease and lipase?
Pancreas
32
What is the purpose of hydrochloric acid in the stomach?
Provides the right pH for the protease enzymes; kills bacteria
33
What is the purpose of bile in the digestive system?
Neutralise the acid which was added to food in the stomach to give the best pH for enzymes to work. Break down (emulsify) fat
34
Where is bile produced?
Liver
35
Where is bile stored?
Gall bladder
36
The site of maximum absorption in the digestive system is...
The small intestine
37
During digestion, carbohydrate is broken down into
Glucose
38
During digestion, protein is broken down into
Amino acid
39
Which enzyme digest protein?
Protease
39
During digestion, lipids are broken down into
Fatty acid and glycerol
40
Which enzyme digests carbohydrates?
Carbohydrase
41
Why is fibre not digested in the body?
Our bodies do not have enzymes that can digest fibre
41
Which enzyme digests fats?
Lipase
42
Why are vitamins and minerals not digested in the body?
They are small enough to be absorbed without digestion
43
What is the purpose of bacteria in our gut?
Digest food we cannot (e.g. cellulose) to give us essential nutrients (e.g. vitamin K)
44
How is the small intestine adapted to increase the rate of absorption?
Villi and microvilli to increase surface area; a good blood supply to transport nutrients; mucus for lubrication; glucose moves from a high concentration in the intestine to a lower concentration in the blood.
44
In which part of the digestive system does water and mineral absorption take place
The large intestine
45
What are the optimum conditions for amylase?
Neutral pH, 37 degreesC
46
What happens to an enzyme if it is boiled or exposed to a strong acid?
It is denatured
47
What is the scientific name for the windpipe?
Trachea
48
The trachea divides into two ________. These then divide into __________
Bronchi. Bronchioles
49
What are the air sacs at the end of each bronchiole called?
Alveoli
50
When we inhale, the volume inside the thorax ____________ so the pressure inside the thorax _____________
Increases. Decreases.
51
Breathing in and out is also known as...
ventilation
52
When we exhale, the diaphragm relaxes and moves upward/downward?
upward
53
Write the word equation for anaerobic respiration in cells
glucose -> lactic acid
53
What features do alveoli have to maximise gas exchange?
Large surface area; concentration gradient (oxygen and carbon dioxide can diffuse); good blood supply; capillary wall only 1 cell thick
54
Which releases more energy - aerobic or anaerobic respiration?
aerobic
55
What is anaerobic respiration in yeast cells known as?
Fermentation
56
Give an example of where fermentation is used
Brewing or baking
57
What are the products of the fermentation reaction?
Ethanol, carbon dioxide

Year 8 24/25 (14 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions