Questions:
1. Cheese is made from milk which has been heated and then has ingredients added
to make a particular sort of cheese.Which of these microorganisms is not used in
cheese production?
Fungi Bacteria Viruses
2. Which microorganism is used in yogurt-making?
Fungi Bacteria Viruses
3. When beer is made (by fermentation) a certain type of microorganism is added to
produce the alcohol.Which microorganism is that?
Choose one correct answer.
Bacteria
Salmonella
Yeast
4. Yeast is used in bread-making.What is its function in bread production?
Choose one correct answer.
It stops the bread from going bad
It adds flavour to the bread
It makes the bread rise
5. Which of these food-related problems is caused by a fungus?
Choose one correct answer.
Salmonella
Mould
E.coli
6. Which of these foods sometimes contains the
harmful microorganism salmonella (meaning that you always have to store it
correctly to avoid this)?Choose one correct answer.
Raw chicken
Brown bread
Fish
7. What is the name of the process that is used to make milk last longer without
going off but which doesn't kill the harmless microorganisms in it?
Choose one correct answer.
Sterilisation
Pasteurisation
Immunisation
8. Which of these conditions are best for the rapid growth of microorganisms such
as bacteria?Choose one correct answer.
Warm and dry
Warm and moist
Cold and dry
Cold and moist
Hot and dry
1
Hot and moist
9. What is the name of the process that kills all microorganisms?Choose one correct
answer.
Cleaning Purification Sterilisation
10. Billie was investigating diffusion using agar cubes. She looked at how quickly
diffusion took place in different sized cubes. Her results are below but they are
unreliable. Why?
Time taken to turn white
Size of agar cube (cm3)
(minutes)
Small (1 x 1 x 1) 5
Medium (2 x 2 x 2) 10
Large (3 x 3 x 3) 12
Choose one correct answer.
She used different sized cubes
She used a stopwatch to time how long the cubes to turn white
The time went up with every cube
She only did the investigation once
11. Billie was investigating diffusion using agar cubes. She looked at how quickly
diffusion took place in different sized cubes.
Look at her results.Can you spot the anomalous result?
Size of agar cube (cm3) Time taken to turn white (minutes) Mean time taken to
Trial 1 Trial 2 Trial 3 turn white (minutes)
Small (1 x 1 x 1) 5 5 4
Medium (2 x 2 x 2) 10 9 9
Large (3 x 3 x 3) 12 2 12
Choose one correct answer.
12
9
5
2
12. Billie was investigating diffusion using agar cubes. She looked at how quickly
diffusion took place in different sized cubes.
Look at her results.
Can you calculate the mean time for each cube to turn from pink to white?
Size of agar cube (cm3) Time taken to turn white (minutes) Mean time taken to
Trial 1 Trial 2 Trial 3 turn white (minutes)
Small (1 x 1 x 1) 5 5 4
Medium (2 x 2 x2 ) 10 9 9
Large (3 x 3 x 3) 12 2 12
Match:
2
Small 4.7 minutes
Medium 9.3 minutes
Large 12 minutes
13. During diffusion, particles move from an area of _____concentration to an area of
_______concentration. They're said to move down a_______ gradient. Diffusion is a
process, which means that no________ is needed.
14. How are unicellular organisms different to multicellular organisms?
Choose two options from below.
A Unicellular organisms are made up of more than one cell whereas multicellular
organisms are made up of only one cell.
B Unicellular organisms are made up of only one cell whereas multicellular
organisms are made up of more than one cell.
C A unicellular organism uses diffusion to exchange substances through its cell
membrane whereas multicellular organisms have specialised structures for
exchanging materials.
D A unicellular organism doesn't use diffusion to exchange substances through its
cell membrane while multicellular organisms have specialised structures for
exchanging materials.
Choose all correct answers.
A
B
C
D
15. Unicellular organisms use diffusion to exchange substances
with the environment. What sort of substances do
unicellular organisms exchange?
Choose all correct answers.
Waste products
Food molecules
Oxygen
Sunlight
16. Give two examples of unicellular organisms.Choose all correct answers.
Amoeba
Lungs
Intestines
Bacteria
17. Diffusion is a process that doesn't need energy, which is really useful for
unicellular organisms.What's the word used to describe this?
Diffusion is a __________________process, which means that it doesn't need energy
18. Amoebas are unicellular organisms that use diffusion to exchange substances.
Why are amoebas good at diffusion?
3
Choose one correct answer.
Amoebas have a small surface area
Amoebas have a large surface area
Amoebas don't have a surface area
19. How are unicellular organisms well suited for diffusion?
Unicellular organisms are well suited for diffusion because they have a long / short
diffusion distance from the outside of the cell to the inside of the cell allowing diffus
ion to happen quickly / slowly.
20. Amoebas are found living in water.
Imagine that one amoeba is using 50 molecules of oxygen to respire. Surrounding
the amoeba there are 100 molecules of oxygen dissolved in the water.
Which way will the oxygen diffuse? Choose one correct answer.
The oxygen won't diffuse at all - it will stay as it is
From the water into the amoeba
From the amoeba into the water
21. Why do multicellular organisms have specialised systems to get the substances
they need?
Because multicellular organisms are made up of many________ , they need help to
exchange materials as simple __________won't always work.
22. X organisms don't have complex transport systems. They have a Y membrane
which is selective. This means it will only let selective substances diffuse Z.
