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Checkpoint Biology 0893

Grade 6 - Unit 1: Cells and organisms

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Grade 6 - Unit 4: Living organisms and classification

0/12 Dr Dabour Hub Science Diagram and Course Material

Grade 6 - Unit 7: Microorganisms and food webs

0/11 Dr Dabour Hub Science Diagram and Course Material

Grade 7 - Unit 1: Breathing and respiration

0/12 Dr Dabour Hub Science Diagram and Course Material

Grade 7 - Unit 4: Ecosystems

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Grade 7 - Unit 7: Nutrition, health and movement

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Grade 8 - Unit 1: Cells and organisms

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Grade 8 - Unit 4: Living organisms and classification

0/12 Dr Dabour Hub Science Diagram and Course Material

Grade 8 - Unit 7: Microorganisms and food webs

0/10 Dr Dabour Hub Science Diagram and Course Material
Quiz

Checkpoint Grade 6 Unit 7 – 7.1 Microorganisms

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Microorganisms Checkpoint Biology quiz: free practice for Cambridge Checkpoint Biology 0893. Work through this Microorganisms Checkpoint Biology quiz and get instant feedback on every answer. If you get stuck, review the 3.1 Microorganisms lesson. More practice: Cambridge Checkpoint Biology 0893 — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 45
  • Passing grade: B+
  • Time limit:
Start Quiz
1.
Which statement best expresses the lesson objective about Microorganisms?
Explain what a microorganism is
The terms agar jelly and algae are always interchangeable
Evidence is unnecessary when studying Microorganisms
Every model is an exact copy of reality
2.
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
3.
Mona left an agar dish open in the school corridor for 10 minutes, sealed it and kept it warm. The diagram shows it 3 days later. Which statement about spots P and Q is correct?
Dr Dabour Hub Science Diagram and Course Material
Each spot is a single microorganism that grew very large; Q is a bacterium
Each is a colony of many cells grown from one cell; Q is a mould because it is made of threads
Each spot is a speck of dust from the corridor; nothing living is in them
P is a virus colony and Q is a bacterium colony, because they are different sizes
4.
The diagram shows three structures, P, Q and R, that cause changes in food or disease. Which one is a bacterium?
Dr Dabour Hub Science Diagram and Course Material
P, because it has a cell wall but no nucleus
Q, because it has a nucleus and a cell wall
R, because it is the smallest living cell
Q, because it is growing a small bud
5.
Joseph mixed yeast with sugar solution in three flasks and put each in a different water bath. The graph shows the gas collected. Which conclusion is best supported?
Dr Dabour Hub Science Diagram and Course Material
Yeast respires faster the hotter it gets, so 70 °C is the best temperature
Yeast only respires at 20 °C, because that line is the steadiest
The temperature of the water bath has no effect on the yeast
Of the temperatures tested, yeast respired fastest at 35 °C, and at 70 °C it did not respire at all
6.
Look at the apparatus. After 20 minutes the clear liquid C turned milky. What does this show?
Dr Dabour Hub Science Diagram and Course Material
The yeast in B released oxygen gas
The water in A leaked into the tube
The yeast in B released carbon dioxide gas
The sugar in B turned into limewater
7.
Class 6B pressed fingertips onto sterile agar dishes after different hand treatments. The bar chart shows the results. Which conclusion is best supported?
Dr Dabour Hub Science Diagram and Course Material
Soap and water removed the most microorganisms, but some were still left on the hands
Rinsing in cold water removes all the microorganisms from hands
Washing with soap and water leaves hands completely free of microorganisms
Unwashed hands carry fewer microorganisms than rinsed hands
8.
The diagram shows mould growing on bread. Which labelled part makes the spores that float through the air and spread the mould to other food?
Dr Dabour Hub Science Diagram and Course Material
Part A, the threads growing into the bread
Part C, the slice of bread itself
Part A, because the threads swim through air
Part B, the round black cases on upright threads
9.
Use the table. There are 1000 micrometres in 1 mm. About how many of these bacteria, lined up end to end, would fit across 1 mm?
About 2 bacteria
About 500 bacteria
About 2000 bacteria
About 50 bacteria
10.
Farah made five equal pieces of bread dough with yeast and kept them at different temperatures. Use the table. Why did the dough at 70 °C not rise at all?
The yeast made too much carbon dioxide, which escaped at once
The yeast needed even more heat before it could start working
The high temperature killed the yeast, so no carbon dioxide was made
The dough at 70 °C had no sugar in it at the start
11.
Use the table of features of organism X. Which kind of microorganism is X most likely to be?
An alga that makes its own food using light
A bacterium that feeds on dead material
A virus that lives in pond water
A mould made of threads
12.
Use the table. For which patient could an antibiotic be a suitable treatment?
Leo, whose illness is caused by a virus
Amira, whose illness is caused by bacteria
Chen, whose illness is caused by a virus
Zara, whose illness is caused by a fungus
13.
Use the table. Which two slices should be compared to find out the effect of moisture on mould growth?
Slices 2 and 3
Slices 1 and 2
Slices 1 and 3
Slices 2 and 4
14.
A bacterium reproduces by splitting in two. Use the table. If the pattern continues, how many bacteria will there be after 2 hours?
16 bacteria
24 bacteria
64 bacteria
120 bacteria
15.
Before an experiment on microbes in the air, the Petri dish and agar jelly must both be sterile. Why?
So the agar has extra microorganisms to help the colonies grow
So any colonies that grow must have come from the air being tested
So the dish is warm enough for microorganisms to grow
So the agar jelly sets hard and does not spill
16.
After exposing an agar dish, Pedro puts the lid back on, seals it with sticky tape and never opens it again. What is the main reason?
So the colonies cannot escape by walking out of the dish
So the microorganisms get more oxygen and grow faster
So nobody touches or breathes in anything that grows, in case it is harmful
So light can reach the colonies and help them make food
17.
The white powder on the skin of a grape is yeast, and you can see it without a microscope. Why is yeast still classed as a microorganism?
The powder is millions of cells together; a single yeast cell needs a microscope
Yeast cells are large enough to see, but they have no nucleus
Yeast is a virus, and all viruses are microorganisms
The powder is sugar made by the grape, not the yeast
18.
Nadia has flu and asks her doctor for some antibiotics left over from her brother's chest infection. Which is the best response?
Yes – antibiotics kill all microorganisms, so they will cure flu quickly
No – flu is caused by a virus, and taking antibiotics that are not needed helps resistant bacteria develop
Yes – but only if she takes twice the dose her brother took
No – antibiotics only work on fungi, not on bacteria
19.
When a loaf of bread made with yeast is cut, it is full of small holes. What made the holes?
Bubbles of oxygen made by the yeast as it respired
Air that the baker blew into the dough
Water that boiled away from the flour
Bubbles of carbon dioxide made by the yeast as it respired
20.
Hassan says: "All microorganisms are harmful germs." Which piece of evidence best shows that he is wrong?
Bacteria are used to make yoghurt, and most bacteria in our gut are harmless
Salmonella bacteria cause food poisoning if food is undercooked
Flu viruses are spread by coughs and sneezes
Athlete's foot is caused by a fungus that grows on damp skin
21.
Zainab sorted four microorganisms into the groups bacteria, fungi, viruses and protozoa. Which pairing is correct?
Amoeba – a type of bacterium
Yeast – a single-celled fungus
Penicillium – a type of virus
Salmonella – a type of fungus
22.
A worksheet on growing microbes in the laboratory links key words to definitions. Which pairing is correct?
Sterile – full of useful microorganisms
Agar – the lid that keeps a Petri dish closed
Colony – many cells made by one cell dividing again and again
Petri dish – the jelly containing nutrients
23.
Food factories and medicine makers put some microbes to work. Which pairing is correct?
Viruses – making bread dough rise
Yeast – making the antibiotic penicillin
Protozoa – making cheese from milk
Bacteria – turning milk into yoghurt
24.
A nurse lists illnesses and the type of pathogen behind each one. Which pairing is correct?
Tuberculosis – caused by bacteria
Measles – caused by bacteria
Athlete's foot – caused by a bacterium
Malaria – caused by a fungus
25.
Which statement correctly describes bacterial cell?
a visible patch of millions of microorganisms grown from one cell
a cell with a cell wall, membrane and cytoplasm but no true nucleus
the splitting of a bacterial cell into two identical cells
the temperature at which a microorganism grows fastest
26.
Which term is described as: a microorganism that causes disease?
pathogen
aseptic technique
binary fission
antiseptic
27.
Which term is described as: a visible patch of millions of microorganisms grown from one cell?
incubation
colony
aseptic technique
optimum temperature
28.
A microorganism that causes disease is a _____.
producer
consumer
decomposer
pathogen
29.
Bacteria reproduce by _____.
budding off small cells
splitting in two
releasing spores from cases
entering other cells
30.
When yeast ferments sugar, the word equation is: glucose → ethanol + _____.
oxygen gas
water vapour
carbon dioxide
nitrogen gas
31.
Penicillin, one of the first antibiotics, is made by a _____.
bacterium living in the gut
virus inside a cell
protozoan in pond water
mould, which is a fungus
32.
A pathogen is a microorganism that causes disease. - True or false?
True
False
33.
Look at structure R in the diagram of P, Q and R. R is not usually called a microorganism because it is not made of a cell. True or false?
Dr Dabour Hub Science Diagram and Course Material
False – R is a bacterium, so it is a microorganism
False – R has a nucleus, so it is a cell
True – R is a virus: genetic material in a protein coat
True, but only because R is larger than P
34.
Look at the graph of bacteria in milk. The results show that keeping milk in a fridge kills the bacteria in it. True or false?
Dr Dabour Hub Science Diagram and Course Material
True – the fridge line stays at zero
False – the number still rises in the fridge, only more slowly
True – bacteria cannot survive at 4 °C
False – bacteria grow faster in the fridge
35.
Using the table of dough results, Ali concludes: "The hotter the dough, the faster the yeast makes it rise." True or false?
True – every warmer piece rose more
True, because 70 °C gave the greatest rise
False – colder dough always rises the most
False – the rise increased only up to 35 °C, then decreased
36.
A bacterium has a nucleus that holds its DNA. True or false?
False – its DNA is loose in the cytoplasm
True – every cell has a nucleus
True, but only in large bacteria
False – bacteria have no DNA at all
37.
Viruses can only reproduce inside living cells. True or false?
False – they split in two on agar jelly
True – they need a host cell to make copies
False – they reproduce by making spores
True, but only inside dead cells
38.
A mushroom is only a small part of a fungus; most of the fungus is a tangle of thin threads hidden in soil or wood. True or false?
False – the mushroom is the whole fungus
False – fungi are always single cells
True – the threads are too thin to see easily
True, but only for moulds on bread
39.
Algae are microorganisms that can make their own food using light, as plants do. True or false?
False – algae must eat other microbes
False – algae are a kind of virus
True, but only in complete darkness
True – they give pond water its green colour
40.
Nour says: "Putting chicken in the freezer kills all the bacteria, so it can be left out for days after thawing." True or false?
False – cold only slows bacteria; they grow again when warm
True – no bacteria survive freezing
True, but only if frozen for a week
False – freezing makes bacteria grow faster
41.
One colony seen on an agar dish is a single bacterium that has grown very large. True or false?
True – bacteria grow bigger on agar
False – it is millions of cells from repeated dividing
True, but only after a week at 25 °C
False – it is one virus particle
42.
Yeast releases oxygen as it respires in bread dough. True or false?
True – that is why the dough rises
True, but only in a very warm oven
False – it releases carbon dioxide and ethanol
False – yeast releases nitrogen gas
43.
Covering your mouth and nose when you sneeze helps to stop flu spreading, because the virus travels in tiny droplets in the air. True or false?
False – flu spreads only through food
False – flu is caused by a fungus
True, but only if you use an antibiotic
True – fewer droplets reach other people
44.
Sleeping under a mosquito net helps to reduce malaria, because the microorganism that causes it is carried by mosquitoes. True or false?
True – the net stops mosquitoes biting
False – malaria spreads in drinking water
False – malaria is caused by a virus in air
True, because nets kill all bacteria
45.
Bacterial cells have no true nucleus. - True or false?
True
False
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Part of Grade 6 - Unit 7: Microorganisms and food webs — see every lesson and quiz in this unit.
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