MP3 Ch 8 Ecology

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

Chapter 8 Ecology - page 200

8.1 Food chains and Food webs

Aims:

Describe pyramids of numbers and biomass (and energy)

Describe (explain) how energy moves through trophic levels in ecosystems

Explain that energy is lost from foodchains, mainly as heat

How to draw a pyramid?

Use rectangles instead of triangles

Pyramids of numbers can have 'strange' shapes

This is an example of

1. pyramid of numbers or biomass
2. pyramid of food
3. accumulation
4. pyramid of energy

01:02

Recall MRSGREN

01:55

List three reasons why energy is lost in between trophic levels

Write down any questions you have about 8.1 Food chains and webs
or
two things you have learned today

8.2 Population changes

Aim:

Define population

Competition for resources limits population size

List the major population limitations

Predator-prey population changes

Human population changes

S-shape Growth curve of micro-organisms

Can you list the limiting factors?

Suggest three factors that might decrease the population of lynx?

What is the influence of the physical environment?

And migration?

End of lesson 8.2

8.3 Human Influences

(Climate change only)

Aim:

Increasing carbon dioxide levels are associated with climate change

climate change

How do we generate energy?

What are renewable and non-renewable sources of energy?

Which is not a greenhouse gas?

1. oxygen
2. water vapour
3. carbondioxide
4. methane

https:

Which is a example of a non-renewable energy source?

1. solar energy
2. wind energy
3. burning biomass
4. burning petrol/diesel

What could be an effect of global warming?

1. increase of oxygen levels in the sea
2. disruption of ecosystems

Think Pair Share

Find as many links to climate change due to global warming in this image

Resource: BBC Bitesize

Read the revision pages in BBC Bitesize and take the test. Share any questions you have here:

Case study: Methane

- What is methane?

- What is the source?

- How can we use methane?

- What if methane levels increase in the atmosphere?

End of 8.3