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Course: HIA International — Grade 6
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HIA International — Grade 6

Unit 1: Cells and organisms

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Unit 2: States of matter, atoms and compounds

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Unit 3: The Solar System and energy

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Unit 4: Living organisms and classification

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Unit 5: Metals, non-metals, acids and alkalis

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Unit 6: Sound, the Earth and eclipses

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Unit 7: Microorganisms and food webs

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Unit 8: Chemical reactions

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Unit 9: Electricity and circuits

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Quiz

Checkpoint Grade 6 Unit 7 – 7.4 Microorganisms In Food Webs

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Microorganisms In Food Webs Checkpoint Biology quiz: free practice for Cambridge Checkpoint Biology 0893. Work through this Microorganisms In Food Webs Checkpoint Biology quiz and get instant feedback on every answer. If you get stuck, review the 3.4 Microorganisms in food webs lesson. More practice: Cambridge Checkpoint Biology 0893 — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 39
  • Passing grade: B+
  • Time limit:
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1.
Which statement best expresses the lesson objective about Microorganisms in food webs?
Draw food chains and food webs that include decomposers
The terms decomposer and dung are always interchangeable
Evidence is unnecessary when studying Microorganisms in food webs
Every model is an exact copy of reality
2.
Which practical work belongs to Microorganisms In Food Webs?
Interpret feeding relationships and check arrow direction from food to consumer
Plan an investigation into how temperature affects the rate of decay
Use sterile technique and observe colonies without opening cultures
Add microorganisms to food-web models and connect decomposition with nutrient cycling
3.
The diagram shows part of a pond food web. A chemical spill kills most of the phytoplankton. Which change is most likely to happen first?
Dr Dabour Hub Academy - figure 1
The number of amoebae falls because they eat phytoplankton
The number of herons rises because they have more space
The numbers of water fleas and mayfly larvae fall
The number of bacteria falls because they eat water fleas
4.
Ravi drew the woodland food chain shown. What is the best correction to his drawing?
Dr Dabour Hub Academy - figure 2
Reverse every arrow so it points from the food to the organism that eats it
Move the sparrowhawk to the start because it is the largest animal
Nothing is wrong, because arrows in a food chain mean "eats"
Add an arrow from the oak leaves straight to the sparrowhawk
5.
The diagram shows how nutrients move through a savanna. Which numbered arrow shows nutrients being returned to the soil after decomposers digest dead material?
Dr Dabour Hub Academy - figure 3
Arrow number 3
Arrow number 6
Arrow number 5
Arrow number 7
6.
Students sampled a woodland plot each month after the leaves fell. Which explanation best fits their results?
Dr Dabour Hub Academy - figure 4
The trees took nitrate out of the leaves and stored it in the soil
Rain washed the nitrate out of the soil and into the leaf litter
The dead leaves made brand-new nitrate as they dried out
Decomposers digested the dead leaves and released nitrate into the soil
7.
The drawing shows three kinds of microorganism, A, B and C, seen in a drop of pond water. Each option pairs a letter with its role in the pond food web. Which pairing is correct?
Dr Dabour Hub Academy - figure 5
B – producer, because it surrounds its food
C – consumer, because it makes food from light
A – decomposer, because it is the largest cell
A – producer, because it has chloroplasts
8.
Zainab set up three trays and left them for 8 weeks before sowing cress seeds. Which conclusion is best supported by her results?
Dr Dabour Hub Academy - figure 6
Heating the soil added nutrients, so the cress grew best there
Living microbes broke down the leaves, releasing minerals that helped the cress grow
Dead leaves harm cress, so the soil-only tray grew best
Cress gets its food from the dead leaves, not by photosynthesis
9.
Using only the information in the table, which is a correct food chain?
microscopic algae → limpet → dog whelk → shore crab
limpet → microscopic algae → dog whelk → gull
gull → shore crab → dog whelk → limpet
microscopic algae → dog whelk → limpet → shore crab
10.
A disease killed most of the foxes on a hillside in 2020. Which is the best explanation for the change in grass cover from 2019 to 2022?
Foxes eat grass, so fewer foxes means less grass eaten
With fewer foxes, more rabbits survived and ate more grass
The fox disease spread to the grass and killed it
Decomposers had fewer dead foxes, so they ate the grass
11.
Which organism in the table is a saprotroph?
Organism P
Organism R
None of the three
Organism Q
12.
Priya sampled lake water each month. Which explanation best fits the pattern in her results?
Phytoplankton eat water fleas, so the phytoplankton fell when fleas rose
Both populations rose and fell together because they do not interact
Water fleas make food by photosynthesis, so they peaked in the sunniest month
Water fleas increased after phytoplankton rose, then their feeding reduced the phytoplankton
13.
Leo compared leaf decay in three soil samples. What do his results show?
Only fungi break down the leaves
Both bacteria and fungi break down the leaves
Heating the soil made the leaves decay faster
Bacteria stop fungi from breaking down leaves
14.
In a food chain diagram, what do the arrows show?
Which animal is bigger than the other
The direction in which each animal moves
The direction in which energy is transferred
The way nutrients return to the soil
15.
Why do most food chains have no more than four or five links?
Top predators eat all of the decomposers
Producers can only feed five animals at once
Nutrients run out after the fourth animal
Energy is lost at each step, so little is left for the top
16.
In the open ocean there are almost no large plants. What is at the start of most ocean food chains?
Phytoplankton, which make food by photosynthesis
Bacteria, which make food from dead fish
Small fish, which make food from sea water
Protozoa, which make food from sunlight
17.
Which statement about energy and nutrients in an ecosystem is correct?
Energy and nutrients are both recycled by decomposers
Energy is recycled, but nutrients are lost as heat
Nutrients are recycled, but energy flows through and is lost as heat
Neither energy nor nutrients can pass between organisms
18.
Anya is adding bacteria and fungi to her poster of a woodland food web. Where should the arrows to the decomposers come from?
Only from the top predator, as nothing eats it
From every organism, as all produce waste and die
Only from the plants, as decomposers are herbivores
From no organisms, as decomposers make their own food
19.
Why do many farmers spread cow manure on their fields before planting crops?
The crops eat the manure through their leaves as food
The manure contains energy that the crops need instead of light
The manure kills the decomposers that damage crop roots
Decomposers break it down, releasing minerals the crop roots absorb
20.
A class built a model food web by linking cards with string. Which is the most important limitation of this model?
It does not show how much energy is lost at each step
It has too many organisms to be a food web
Cards cannot show the names of the organisms
String cannot show which organism eats which
21.
Kai says: "The mushroom growing on the log is a producer because it is not an animal." Which is the best correction?
It is a producer, because all fungi photosynthesise at night
It is a primary consumer, because it eats living trees
It is a decomposer: it has no chlorophyll and feeds on dead wood
It is a predator, because it hunts insects in the log
22.
A farmer moves all the cattle out of a large field for a whole year. What is most likely to happen to the dung beetles that live there?
Their numbers rise because the cattle no longer tread on them
Their numbers fall because their food supply runs out
Their numbers stay the same because they can make their own food
They become producers and feed on the grass instead
23.
Each option pairs a key term with a meaning. Which pairing is correct?
Food web – one single chain of feeding
Producer – an animal that eats plants
Detritus – dead organic matter
Nutrient recycling – energy moving up a chain
24.
Each option pairs a position with a step in the recycling of nutrients. Which pairing is correct?
First – plants take up nutrients from the soil
First – decomposers respire, releasing carbon dioxide
Last – plants and animals die or produce waste
Second – bacteria and fungi release enzymes
25.
In the chain algae → mayfly larva → trout → otter, each option pairs an organism with its role. Which pairing is correct?
Mayfly larva – producer
Otter – primary consumer
Algae – decomposer
Trout – secondary consumer
26.
Use the diagram. About _____ of the energy in the seaweed reaches the sea otters.
Dr Dabour Hub Academy - figure 7
3000 kJ of energy
27 000 kJ of energy
300 kJ of energy
30 kJ of energy
27.
Plants take in the nutrients released by decomposers through their _____.
leaves from the air
roots from the soil
flowers from insects
fruits from animals
28.
Microscopic algae in the sea are called _____; they are the producers of ocean food webs.
protozoa
decomposers
bacteria
phytoplankton
29.
The data show that most of the energy taken in by the aphids is not passed on to the ladybirds. True or false?
False – the statement is wrong
False – the ladybirds gain more energy than the aphids
True – the statement is correct
False – all the energy is passed on to the ladybirds
30.
Energy is recycled in an ecosystem in the same way that nutrients are. True or false?
True – the statement is correct
True, because decomposers recycle energy
True, but only in ocean food webs
False – energy is lost as heat and not reused
31.
Protozoa such as amoebae are consumers because they feed on bacteria and algae. True or false?
False – the statement is wrong
True – the statement is correct
False – amoebae are producers
False – amoebae are decomposers of rock
32.
In a food chain, the arrow between a rabbit and a fox should point from the fox to the rabbit. True or false?
False – it points from rabbit to fox
True – the statement is correct
True, because the fox is the predator
True, but only in winter
33.
Decomposers feed on only one level of a food web, the producers. True or false?
True – the statement is correct
True, because they only digest leaves
False – they break down remains from every level
True, but only in a forest
34.
A primary consumer is an animal that eats producers. True or false?
False – the statement is wrong
False – primary consumers eat other animals
False – primary consumers make their own food
True – the statement is correct
35.
Plants get their energy from the minerals that decomposers release into the soil. True or false?
True – the statement is correct
False – their energy comes from light
True, because minerals are a type of food
True, but only for plants in the shade
36.
Food chains in the open ocean usually start with microscopic algae rather than large plants. True or false?
True – the statement is correct
False – the statement is wrong
False – they start with sharks
False – they start with bacteria
37.
A food web is a more complete model of feeding than a single food chain, because most animals eat more than one kind of food. True or false?
False – the statement is wrong
False – a food chain shows every link
True – the statement is correct
False – food webs leave out all producers
38.
About 90% of the energy in the grass a cow eats becomes part of the cow's body. True or false?
True – the statement is correct
False – only about 10% is passed on
True, because cows eat a lot of grass
True, but only for young cows
39.
Dead organic matter such as fallen leaves and dung is called detritus. True or false?
False – the statement is wrong
False – detritus means living plants
False – detritus is a type of predator
True – the statement is correct
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Part of Unit 7: Microorganisms and food webs — see every lesson and quiz in this unit.
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