Bioaccumulation | Science | Quizalize & Oak National Academy

Starter quiz

Look at the woodland food web. Which of the following organisms is an apex predator?
- Chiff chaff
- Vole
- Blue tit
- Stoat ✓
Look at the woodland food web. Which of the following organisms is a producer?
- Blue tit
- Aphid
- Lady bird
- Bramble ✓
An ecosystem includes...
- only the living organisms in an area.
- only the non-living parts of an area.
- both the living organisms and non-living parts of an area. ✓
Look at the food chain diagram. What things will happen if the deer die out?
- The tigers will start to eat the grass
- The population of grass will decrease
- The population of grass will increase ✓
- The population of tigers will decrease ✓
Farmers use chemicals to help them produce enough food for the human population. Having enough food for the human population is called...
- food security. ✓
- a food bank.
- food shortage.
- a food hamper.
Chemicals which kill pests are called ...
- 'pesticides' ✓

What does the hazard symbol mean?
- Corrosive
- Toxic ✓
- Hazardous
- Corrosive
- Irritant
Match the words with their correct meanings.
- Pesticide
  
  ⇔
  
  a chemical which kills organisms that might eat or damage a crop ✓
- Herbicide
  
  ⇔
  
  a chemical which kills plants. They are sometimes called weedkillers ✓
- Insecticide
  
  ⇔
  
  a chemical which kills insects ✓
- Fungicide
  
  ⇔
  
  a chemical which kills moulds ✓
Toxic chemicals can build up in organisms in a food chain. This is known as ...
- bioaccumulation ✓
- excretion
- pollution
- magnification
Look at the food web diagram. Which of the organisms would be killed by a herbicide?
- Vole
- Moth larva
- Bramble ✓
- Ladybird
Look at the food web diagram. How many organisms would be killed directly by an insecticide?
- 1
- 2
- 3 ✓
- 4
- 5
Look at the food chain diagram. Which of the organisms is most likely to build up toxic levels of insecticide in their bodies?
- Organism A
- Organism B
- Organism C
- Organism D ✓

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Some toxic substances are persistent (they stay in the environment and do not break down).
If consumed, persistent toxic substances can be passed up the food chain.
The bioaccumulation of toxic substances can cause damage to organisms, particularly top predators.
The use of pesticides in farming can cause bioaccumulation.

Pupils do often not understand that pesticides can build up within a food chain.

The lesson covers examples of how pesticides can be absorbed into producers and passed along food chains as organisms eat food.

Toxic - A toxic substance is one which is poisonous to organisms.
Bioaccumulation - An increase in the concentration of a chemical within an organism is called bioaccumulation.
Pesticide - Pesticides are chemicals that are used to control pests (organisms that compete with humans for food supplies).