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Checkpoint Biology 0893

Grade 6 - Unit 1: Cells and organisms

0/11 Dr Dabour Hub Science Diagram and Course Material

Grade 6 - Unit 4: Living organisms and classification

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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

4.4 Bioaccumulation

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Bioaccumulation Checkpoint Biology quiz: free practice for Cambridge Checkpoint Biology 0893. Work through this Bioaccumulation Checkpoint Biology quiz and get instant feedback on every answer. If you get stuck, review the 5.4 Bioaccumulation lesson. More practice: Cambridge Checkpoint Biology 0893 — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 42
  • Passing grade: B+
  • Time limit:
Start Quiz
1.
Bioaccumulation means toxic substances:
Build up in organisms higher up a food chain
Only affect plants
Are harmless
Disappear from food chains
2.
The diagram shows mercury levels measured along a food chain off the coast near a factory. How many times more concentrated is the mercury in the tuna than in the seawater?
Dr Dabour Hub Science Diagram and Course Material
12 000 times
1.2 times
120 times
1 200 000 times
3.
The bar chart shows DDT in a lake food chain. Aisha says the grebe has the most DDT because it drinks the most lake water. Which is the best explanation of the grebe's value?
Dr Dabour Hub Science Diagram and Course Material
It drinks more water than all the other organisms put together
It eats many perch, and each perch holds DDT stored in its fat
Its body turns the food it eats into new DDT molecules
It is the largest organism, so DDT grows bigger inside it
4.
Scientists measured the shells of osprey eggs collected from one region over 55 years. Which statement is best supported by the graph?
Dr Dabour Hub Science Diagram and Course Material
Shells were at their thinnest in the years after 1990
The ban on DDT caused the eggshells to become thinner
Shells thinned while DDT was used and thickened again after the ban
Eggshell thickness stayed the same throughout the period
5.
A persistent insecticide washes from a field into the pond whose food web is shown. After some years, which organism is likely to contain the highest concentration of the insecticide?
Dr Dabour Hub Science Diagram and Course Material
The pondweed
The minnow
The pond snail
The heron
6.
Mr Okafor's class models a marine food chain with cups and red beads, as shown. No beads are removed at any stage. How many red beads does each seal end up with?
Dr Dabour Hub Science Diagram and Course Material
12 red beads
3 red beads
4 red beads
24 red beads
7.
Farida's class was given data on mercury in twelve swordfish caught in the same area. Longer swordfish are older. Which conclusion is best supported by the graph?
Dr Dabour Hub Science Diagram and Course Material
Mercury makes swordfish grow longer than normal
Young swordfish contain no mercury at all in their muscle
Mercury is removed from swordfish as they grow older
Older fish have built up more mercury over their lives
8.
Tomás concludes from the graph: "This proves that DDT was the only reason peregrine numbers fell." Which is the best evaluation of his conclusion?
Dr Dabour Hub Science Diagram and Course Material
He is right, because the numbers fell while DDT was used
The data show a link, but other factors may also have played a part
He is wrong, because numbers rose while DDT was still used
He is right, because the numbers returned to exactly 410 pairs
9.
The table shows PCB levels in an Arctic food chain. Between which two neighbouring levels does the concentration increase by the largest factor?
Seawater to zooplankton
Ringed seal to polar bear, as it rises by the most ppm
Arctic cod to ringed seal
Zooplankton to Arctic cod
10.
A farmer must choose an insecticide for her apple orchard, where hawks hunt small birds. Using the table, which is the better choice to protect the hawks, and why?
M – it lasts for years, so she sprays less often
M – it is stored in fat, so it stays out of the soil
K – it dissolves in water, so it builds up in fish
K – it breaks down fast and is excreted
11.
A health leaflet contains the table below. Which pattern does it show?
Fish that feed on plankton contain the most mercury
Fish feeding higher in the food chain contain more mercury
Mercury is the same in every fish, whatever it eats
Fish that eat other fish contain the least mercury
12.
Which pair of properties makes a chemical most likely to bioaccumulate in animals?
Persistent and stored in fat
Quickly broken down and dissolved in blood
Easily excreted in urine and sweat
Broken down by sunlight within hours
13.
Kwame wrote: "Top predators have the most poison because they are bigger." Which is the best improved version?
They are bigger, so the poison grows bigger in them
They eat many prey, each containing stored toxin
They drink more polluted water than smaller animals do
They digest the toxin into a more poisonous form
14.
Why are people advised to limit how often they eat large predatory fish such as swordfish and shark?
These fish contain high levels of stored mercury
These fish have used up all their mercury
These fish contain less protein than small fish
Mercury is only found in the bones of small fish
15.
Eagles on an island are laying thin-shelled eggs because of a persistent pesticide used on the island's farms. Which action would best help the eagle population recover?
Spray the pesticide more often in smaller amounts
Move the eagles to the farms so they eat more pests
Ban the pesticide and use biological control
Add more of the pesticide to rivers to dilute it
16.
How did DDT mainly cause populations of birds of prey to fall?
It killed the adult birds straight away when sprayed
The birds laid thin eggshells that broke
It made the birds too heavy to fly and hunt
It killed all the fish the birds needed to eat
17.
Each option pairs a pollutant with a way it can enter food chains. Which pairing is correct?
DDT – made by plankton during photosynthesis
Mercury – industrial waste reaching the sea
PCBs – released when fish breathe out
Insecticide – produced by bacteria in eagles
18.
Think about the osprey food chain: water, plankton, small fish, large fish, osprey. Which pairing is correct?
Producer – small fish
Top predator – plankton
Primary consumer – the osprey
Secondary consumer – large fish
19.
Each option pairs an action with how it helps reduce toxins in food chains. Which pairing is correct?
Treating factory waste – stops mercury entering rivers
Banning DDT – makes old DDT break down at once
Spraying more insecticide – dilutes the toxin in fish
Using persistent pesticides – they leave food chains fast
20.
Each option pairs an observation with an explanation. Which pairing is correct?
High toxin in plankton – plankton eat many large fish
Toxin building up in fat – it is excreted very quickly
Osprey eggs cracking in the nest – DDT caused thin shells
Low toxin in top predators – they eat many prey
21.
Which term is described as: to build up, as DDT does in an animal's body over its life?
insecticide
accumulate
toxic
DDT
22.
Match the term to its correct meaning: biomagnification
to build up, as DDT does in an animal's body over its life
an insecticide first produced in the 1940s that does not break down
the increase in the amount of a substance at each step up a food chain
a substance that kills insects, such as DDT
23.
Match the term to its correct meaning: insecticide
a substance that kills insects, such as DDT
poisonous
to build up, as DDT does in an animal's body over its life
an insecticide first produced in the 1940s that does not break down
24.
Match the term to its correct meaning: toxic
the increase in the amount of a substance at each step up a food chain
an organism that breaks substances down - but it cannot break down DDT
a substance that kills insects, such as DDT
poisonous
25.
Which term is described as: the build-up of a substance inside the body of an organism?
biomagnification
insecticide
bioaccumulation
toxic
26.
Using the table, the concentration of the pesticide in the sparrowhawk is _____ its concentration in the soil.
100 times
1000 times
10 times
10 000 times
27.
A chemical that does not break down easily and stays in the environment for many years is described as _____.
biodegradable
excreted quickly
photosynthetic
persistent
28.
Toxins that bioaccumulate are not excreted; instead they are stored in the animal's _____.
fat tissue
blood sugar
lungs as gas
urine supply
29.
The increase in the concentration of a toxin at each trophic level along a food chain is called _____.
photosynthesis
biological control
biomagnification
decomposition
30.
DDT is an insecticide, which means it kills insects. - True or false?
True
False
31.
A trout was kept for 10 weeks in a tank whose water had a constant, tiny level of pesticide; the graph shows the results. The steady rise inside this one fish is an example of biomagnification. True or false?
Dr Dabour Hub Science Diagram and Course Material
True – the statement is correct
True, because the water level rises too
False – it is bioaccumulation in one fish
True, because a trout is a top predator
32.
The table shows DDT in pike from one lake; DDT was banned in 1972. The data show that the DDT disappeared from the lake straight after the ban. True or false?
False – it fell slowly over many years
True – the statement is correct
True, because 1975 is lower than 1970
True, as none is left in 2000
33.
Two farms grow the same crop. Based on the table, using ladybirds to control aphids protected the blackbirds better than spraying the insecticide did. True or false?
False – the statement is wrong
False, because ladybirds are toxins
False, as blackbirds eat no insects
True – the statement is correct
34.
A top predator can contain a harmful level of a toxin even when the level in the water around it is extremely low. True or false?
False – the statement is wrong
True – the statement is correct
False, because the level must be equal
False – top predators excrete toxins
35.
A pesticide that animals break down within a few hours is likely to biomagnify strongly along a food chain. True or false?
False – it does not stay in the body
True – the statement is correct
True, because it acts very quickly
True, but only in top predators
36.
DDT in a small fish is digested along with its food, so a larger fish that eats it takes in no DDT. True or false?
True – the statement is correct
True, but only if the fish is cooked
True, because DDT is used for energy
False – the statement is wrong
37.
Plankton contain a higher concentration of mercury than the seawater they live in. True or false?
False – the statement is wrong
False – they have exactly the same
True – the statement is correct
False, because plankton make food
38.
Releasing ladybirds to eat aphids on a bean crop avoids adding a persistent chemical to local food chains. True or false?
True – the statement is correct
False – the statement is wrong
False – ladybirds carry DDT
False, because it needs more spray
39.
In biomagnification, the molecules of the pesticide grow larger at each trophic level. True or false?
True – the statement is correct
False – its concentration increases
True, as the predators are larger
True, but only in large fish
40.
Mercury released in factory waste can pass along a food chain to people who eat large fish. True or false?
False – the statement is wrong
False, because mercury is not a toxin
False – mercury stays in the water
True – the statement is correct
41.
A sparrow that eats seeds from a sprayed field will usually contain less pesticide than a hawk that eats many such sparrows. True or false?
False – the statement is wrong
False, because seeds hold the most
True – the statement is correct
False – hawks break pesticide down
42.
Hana wrote: "DDT made eagle numbers fall mainly by poisoning adult eagles so they died at once." Her statement is accurate. True or false?
True – the statement is correct
False – it mainly thinned their eggshells
True, because DDT kills insects
True, but only for young eagles
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Part of Grade 7 - Unit 4: Ecosystems — see every lesson and quiz in this unit.
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