Impacts on Food Webs

This lesson looks at how changes in the environment can affect different organisms within a food web, including the process of bioaccumulation.

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Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.What is decompostion?

Breaking down using heat Break down of dead matter Absorbing nutrients from the environment Process of releasing energy

1/8

Q2.What is the role of the detritivores?

Slow down the rate of decomposition Release mineral ions back into environment Break down dead material into smaller pieces Photosynthesise to make their own food

2/8

Q3.Which of the following is an example of a microbe?

Slug Fungi Worm Woodlice

3/8

Q4.Under normal conditions, which factor does not affect the rate of decay?

Temperature Water Carbon dioxide levels Oxygen levels

4/8

Q5.Which factor is most likely to kill decomposers if it is too high?

Temperature Water Carbon dioxide levels Oxygen levels

5/8

Q6.How does volume of water affect rate of decomposition?

As volume of water increases, the rate of decomposition decreases. As volume of water increases, the rate of decomposition increases and then decreases. As volume of water increases, the rate of decomposition increases. As volume of water increases, the rate of decomposition remains constant.

6/8

Q7.Why do we wrap our food in cling film?

To keep the food moist To keep the temperature cool To stop oxygen helping the decomposers respire and grow To stop carbon dioxide getting in

7/8

Q8.Which of the following statements best explains the design of a compost bin?

Place the bin in a shaded area No holes to ensure oxygen can't get in A light colour so that it can reflect heat to keep the contents cool A dark colour so that it can absorb heat to keep the contents warm

8/8

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.What is decompostion?

Breaking down using heat Break down of dead matter Absorbing nutrients from the environment Process of releasing energy

1/8

Q2.What is the role of the detritivores?

Slow down the rate of decomposition Release mineral ions back into environment Break down dead material into smaller pieces Photosynthesise to make their own food

2/8

Q3.Which of the following is an example of a microbe?

Slug Fungi Worm Woodlice

3/8

Q4.Under normal conditions, which factor does not affect the rate of decay?

Temperature Water Carbon dioxide levels Oxygen levels

4/8

Q5.Which factor is most likely to kill decomposers if it is too high?

Temperature Water Carbon dioxide levels Oxygen levels

5/8

Q6.How does volume of water affect rate of decomposition?

6/8

Q7.Why do we wrap our food in cling film?

To keep the food moist To keep the temperature cool To stop oxygen helping the decomposers respire and grow To stop carbon dioxide getting in

7/8

Q8.Which of the following statements best explains the design of a compost bin?

8/8

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This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Impacts on Food Webs

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.What is the correct definition of interdependence?

When ones organism benefits from another organism When organisms depend on each other for resources When organisms are independent of other organisms for things When organisms compete with other organisms for things

1/8

Q2.Which of the following is an example of interdependence?

Bees getting pollen from a flower Mosquito getting blood from a human Lions fighting for a piece of meat Barnacles growing on a whale's back

2/8

Q3.What is an abiotic factor?

A non-living factor A living factor A live factor An unusual factor

3/8

Q4.Which of the following is a biotic factor?

Moisture levels New diseases Carbon dioxide levels Soil pH

4/8

Q5.Which of the following is NOT a human factor that can affect the population of an organism?

Chopping down forests Burning fossil fuels Hunting endangered species Visiting a zoo

5/8

Q6.Foxes eat partridges. Partridges feed mainly on insects and wild plants (weeds). Some farmers spray their crops with chemicals to kill insects and weeds. How would this affect the number of foxes? Explain why.

Fewer foxes because there are fewer partridges to eat. More foxes because there are more partridges to eat. Fewer foxes because they all die of starvation. Fewer foxes because they have nothing to eat.

6/8

Q7.Farmers spray chemicals on crops to kill unwanted weeds. What are these chemicals called?

Insecticides Herbicides Fertilisers Fungicide

7/8

Q8.The chemical in the spray might also....

Kill plants Kill other animals Increase the number of different plants Help the plants grow

8/8

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Impacts on Food Webs

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.What is the correct definition of interdependence?

1/8

Q2.Which of the following is an example of interdependence?

Bees getting pollen from a flower Mosquito getting blood from a human Lions fighting for a piece of meat Barnacles growing on a whale's back

2/8

Q3.What is an abiotic factor?

A non-living factor A living factor A live factor An unusual factor

3/8

Q4.Which of the following is a biotic factor?

Moisture levels New diseases Carbon dioxide levels Soil pH

4/8

Q5.Which of the following is NOT a human factor that can affect the population of an organism?

Chopping down forests Burning fossil fuels Hunting endangered species Visiting a zoo

5/8

6/8

Q7.Farmers spray chemicals on crops to kill unwanted weeds. What are these chemicals called?

Insecticides Herbicides Fertilisers Fungicide

7/8

Q8.The chemical in the spray might also....

Kill plants Kill other animals Increase the number of different plants Help the plants grow

8/8

Lesson summary: Impacts on Food Webs

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Impacts on Food Webs

Intro quiz - Recap from previous lesson

Intro quiz - Recap from previous lesson

Video

Worksheet

Impacts on Food Webs

Impacts on Food Webs

Lesson summary: Impacts on Food Webs

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Time to move!

The next lesson in: Ecological relationships and classification is: Random Sampling

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The next lesson in:
Ecological relationships and classification
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Random Sampling