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HIA International — Grade 8

Unit 1: Photosynthesis and the carbon cycle

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Unit 2: Properties of materials

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Unit 3: Forces and energy

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Unit 4: Maintaining life

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Unit 5: Reactivity

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Unit 6: Sound and space

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Unit 7: Genes and inheritance

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Unit 8: Rates of reaction

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Unit 9: Electricity

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Quiz

Checkpoint Grade 8 Unit 7 – 7.1 Microorganisms

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Microorganisms Checkpoint Biology quiz set 2: free practice for Cambridge Checkpoint Biology 0893. Work through this Microorganisms Checkpoint Biology quiz set 2 and get instant feedback on every answer. If you get stuck, review the 9.1 Microorganisms lesson. More practice: Cambridge Checkpoint Biology 0893 — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 50
  • Passing grade: B+
  • Time limit:
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1.
Which statement correctly describes microorganism?
single-celled microorganisms
organisms including yeasts and moulds
a nutrient surface used to grow microorganisms
an organism too small to see clearly without magnification
2.
Which statement correctly describes bacteria?
an organism too small to see clearly without magnification
organisms including yeasts and moulds
a nutrient surface used to grow microorganisms
single-celled microorganisms
3.
Which statement correctly describes fungi?
an organism too small to see clearly without magnification
a nutrient surface used to grow microorganisms
organisms including yeasts and moulds
single-celled microorganisms
4.
Which statement correctly describes agar jelly?
an organism too small to see clearly without magnification
single-celled microorganisms
organisms including yeasts and moulds
a nutrient surface used to grow microorganisms
5.
Which of these is the FIRST step in the correct order?
transfer the sample safely
seal and incubate
observe colonies without opening
prepare sterile agar
6.
Which step comes immediately after "transfer the sample safely"?
prepare sterile agar
observe colonies without opening
seal and incubate
7.
Which practical work belongs to Microorganisms?
Plan an investigation into how temperature affects the rate of decay
Add microorganisms to food-web models and connect decomposition with nutrient cycling
Interpret feeding relationships and check arrow direction from food to consumer
Use sterile technique and observe colonies without opening cultures
8.
Lucia spread one type of bacterium over an agar plate, added four paper discs soaked in different antibiotics and kept it at 25 °C for 2 days. Based on the plate, which antibiotic would work best against this bacterium?
Dr Dabour Hub Academy - figure 1
C – bacteria grow right up to the disc edge
B – it has the widest clear area around it
A – its disc sits closest to the dish rim
D – its clear area is smaller, so it is gentler
9.
Hamid drew an amoeba seen with a microscope. Use the scale bar to estimate the length of the amoeba along the arrow.
Dr Dabour Hub Academy - figure 2
About 80 µm
About 20 µm
About 8 µm
About 800 µm
10.
The graph shows the number of flu virus particles in Nasir's body and when he felt ill. Why did Nasir not feel ill on the first two days?
Dr Dabour Hub Academy - figure 3
His immune system had already destroyed all the virus
Viruses cause no harm until antibiotics are taken
The virus had not yet multiplied to large numbers
The virus stays outside the body for the first two days
11.
Health workers marked on a village map every home where someone had a waterborne stomach illness. What is the most sensible next step?
Dr Dabour Hub Academy - figure 4
Close well W1 because it is nearest the river
Test water from well W2 for microbes and advise boiling it
Give every villager antibiotics in case it is flu
Close well W3 because it is furthest from the cases
12.
Yusuf set up four bottles with balloons in a warm water bath. The diagram shows the balloons after 40 minutes. Which two bottles should he compare to show that the yeast must be alive to make gas?
Dr Dabour Hub Academy - figure 5
Bottles C and D
Bottles A and C
Bottles B and C
Bottles A and B
13.
Rania added different amounts of salt to agar dishes, spread the same bacteria on each and counted colonies after 3 days at 25 °C. Which conclusion is best supported by the graph?
Dr Dabour Hub Academy - figure 6
Salt has no effect until more than 8% is added
Any salt above 4% kills every bacterium present
More salt reduced growth, but a few colonies grew even at 10%
The colonies grew fastest in the 4% salt agar
14.
The diagram shows a bacterium. Which label points to its genetic material?
Dr Dabour Hub Academy - figure 7
C – the nucleus in the centre of the cell
A – the chromosomes inside the cell wall
B – the DNA in the protective membrane
D – DNA lying free in the cytoplasm
15.
Use the table. Sample 3 was kept at the same temperature as sample 1 but lasted far longer. What is the best explanation?
Salting and drying left too little water for microbes
Salting and drying killed every microbe forever
Microbes cannot grow at 25 °C in any food
Dried fish contains no food for microbes to use
16.
Ines repeated her antibiotic disc test on three plates. Ignoring the anomalous result, what is the mean width of the clear area for antibiotic Q?
About 15.3 mm
About 21.0 mm
About 46.0 mm
About 20.5 mm
17.
Use the table. Which statement is best supported by the data?
Cases rose every year whatever the vaccination rate
Cases rose when fewer children were vaccinated
Vaccination made no difference to the number of cases
Measles is a bacterial disease so antibiotics lowered cases
18.
Use the table. Which explanation fits the pattern shown?
More use allowed resistant bacteria to survive and spread
The antibiotics changed the viruses into bacteria
Patients became resistant, not the bacteria in them
Resistance fell because the antibiotic was used more
19.
Use the table. How many times longer is the Salmonella bacterium than the flu virus?
About 50 times
About 200 times
About 2 times
About 20 times
20.
Use the table. Why did the amount of ethanol stop rising after day 6?
The yeast began making oxygen instead
Ethanol changed back into sugar after day 6
The yeast had used up all the sugar
The carbon dioxide made the yeast grow faster
21.
In school, dishes of microbes grown from the air are kept at 25 °C rather than at 37 °C. What is the main reason?
Bacteria cannot survive at all at 37 °C
It lowers the risk of growing human pathogens
Agar jelly melts at any temperature above 25 °C
Microbes grow faster at 25 °C than at 37 °C
22.
Before and after transferring bacteria, Mei heats the wire loop in a flame until it glows red. Why?
To kill any microbes on the loop
To help the bacteria stick to the wire
To warm the agar so bacteria grow faster
To sterilise the air above the Bunsen burner
23.
In an antibiotic disc test, Olu also places a disc soaked only in sterile water on the plate. What does this disc show?
How much antibiotic each disc contains
Which antibiotic is the strongest of all
That the water kills the bacteria nearby
Whether the paper disc alone affects growth
24.
Which action would do most to slow the spread of antibiotic-resistant bacteria?
Give antibiotics to everyone with a cold or flu
Stop using vaccines so immunity develops naturally
Only prescribe antibiotics for bacterial infections
Use the same antibiotic for every kind of infection
25.
Yeast is used in both bread-making and brewing. Which statement correctly compares them?
Bread needs the ethanol; brewing needs the oxygen
Bread needs the carbon dioxide; brewing needs the ethanol
Both need the oxygen that yeast gives off
Bread needs the oxygen; brewing needs the sugar
26.
Why are microorganisms used at a sewage treatment works?
They break down waste into simpler substances
They add pathogens that clean the water
They turn sewage directly into drinking water
They make the waste give off more oxygen
27.
Tariq wants to find out whether the amount of sugar affects how fast yeast respires. Which plan would give the most valid results?
Vary sugar and temperature together; count bubbles in one minute
Use one flask with lots of sugar and watch whether any bubbles form
Vary the yeast mass; keep sugar the same; see which flask froths most
Vary sugar mass; keep yeast, water and temperature the same; time 20 bubbles
28.
Plasmodium, which causes malaria, is classed as a protoctist, not a bacterium. What feature supports this?
It is carried from person to person
It is too small to see without a microscope
Its single cell contains a nucleus
It has a cell membrane and cytoplasm
29.
A food scientist links ways of preserving food with how each method works. Which pairing is correct?
Refrigerating – kills all bacteria in the food
Freezing – speeds up the growth of microbes
Drying – removes the moisture microbes need
Salting – adds nutrients that microbes cannot use
30.
A health leaflet links diseases with the way they usually spread. Which pairing is correct?
Malaria – shaking hands with an ill person
Salmonella food poisoning – mosquito bites
Athlete's foot – drinking dirty water
Flu – droplets in coughs and sneezes
31.
A revision card links each microorganism with its structure. Which pairing is correct?
Bacterium – DNA held inside a nucleus
Virus – genetic material in a protein coat
Mould – one round cell with no threads
Yeast – long threads called hyphae
32.
A pharmacist links each medicine with an illness it could treat. Which pairing is correct?
Anti-malarial drug – malaria
Antibiotic – influenza (flu)
Antifungal cream – tuberculosis
Antibiotic – measles
33.
Which term is described as: an organism too small to see clearly without magnification?
bacteria
agar jelly
microorganism
fungi
34.
Which term is described as: single-celled microorganisms?
microorganism
fungi
agar jelly
bacteria
35.
Which term is described as: organisms including yeasts and moulds?
microorganism
agar jelly
fungi
bacteria
36.
Which term is described as: a nutrient surface used to grow microorganisms?
microorganism
bacteria
fungi
agar jelly
37.
Mosquitoes carry the malaria parasite from one person to another. An animal that spreads a pathogen like this is called a _____.
decomposer
vector (carrier)
host cell only
protein coat
38.
Bread dough rises faster in a warm place because warmth speeds up the yeast's _____.
photosynthesis
digestion of oxygen
respiration
production of spores
39.
Microorganisms grow best when they have warmth, moisture and _____.
bright sunlight
plenty of salt
a cold, dry place
a supply of food
40.
As well as yoghurt, bacteria are used in the food industry to make _____.
cheese and similar foods
penicillin tablets
bread dough rise
flu vaccines only
41.
Look at the graph of Nasir's flu. The fall in virus particles after day 5 is best explained by his immune system fighting the virus. True or false?
Dr Dabour Hub Academy - figure 8
False – antibiotics must have killed the virus
False – the virus left once his fever cooled him
True, but only because viruses die after 5 days
True – his body's defences destroyed the virus
42.
The head teacher says the table proves that the hygiene campaign alone caused the fall in flu absences. True or false?
True – absences fell straight after the campaign began
True – hygiene is the only way flu can be controlled
False – other factors, like the flu season ending, could explain it
False – hygiene has no effect on how viruses spread
43.
A virus is not made of a cell; it is genetic material inside a protein coat. True or false?
True – that is the structure of a virus
False – a virus is a very small bacterium
False – a virus has a nucleus and cell wall
True, but only for viruses that infect plants
44.
Yeast is a mould because, like all fungi, it grows as long threads. True or false?
False – yeast is a single-celled fungus
True – yeast and moulds both grow as threads
True – all fungi, including yeast, are threads
False – yeast is actually a kind of bacterium
45.
If a few bacteria survive a dose of antibiotic because they are resistant, they can multiply, so the antibiotic may stop working for later infections. True or false?
False – surviving bacteria always die later
True – the resistant bacteria can build up
False – resistance only happens to viruses
True, but only if the patient has also had flu
46.
Cooking chicken until it is hot all the way through helps prevent Salmonella food poisoning. True or false?
False – Salmonella is a virus, not a bacterium
True – thorough cooking kills the bacteria
False – only freezing can make chicken safe
True, but only if the chicken is eaten cold
47.
Jam made with lots of sugar spoils faster than fresh fruit, because microbes feed on sugar. True or false?
True – the extra sugar is food for the microbes
True – sugar makes microbes reproduce faster
False – jam spoils quickly, but because of the fruit
False – adding a lot of sugar is a preserving method
48.
Tuberculosis and COVID-19 can both be treated by a course of antibiotics. True or false?
True – both are caused by bacteria
True – antibiotics kill every kind of pathogen
False – tuberculosis is caused by a virus
False – COVID-19 is caused by a virus
49.
Every microorganism is a pathogen, including the yeast used to bake bread. True or false?
True – all microbes spread disease
True – yeast causes food poisoning in bread
False – only microbes that cause disease are pathogens
False – yeast is not a microorganism at all
50.
Leila pressed a swab from a door handle onto agar and kept the dish at 5 °C. After 3 days there were no colonies, so she concluded the handle had no bacteria. True or false?
False – the cold may just have slowed growth
True – no colonies means no bacteria at all
True – bacteria only grow on food, not on handles
False – bacteria need light, and the dish was dark
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Part of Unit 7: Genes and inheritance — see every lesson and quiz in this unit.
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