Lesson 1: factors, food relationships

Ecology
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BiologieMiddelbare schoolvwoLeerjaar 4

This lesson contains 28 slides, with interactive quizzes, text slides and 2 videos.

time-iconLesson duration is: 30 min

Items in this lesson

Ecology
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Slide 1 - Slide

Learning objectives
  • Distinguish organisation levels within ecology
  • Distinguish between biotic and abiotic factors and describe their effect on organisms
  • Explain the relationships between different trophic levels and the amount of energy they contain 

Slide 2 - Slide

Slide 3 - Slide


Biosphere

Biosphere

Biomes

Biomes

Ecosystem

Ecosystem

Community

Community

Habitat

Habitat

Environment

Slide 4 - Drag question

Slide 5 - Slide

1

Slide 6 - Video

06:21
Autotrophs
Heterotrophs
Consumer
Producer
Carbon from organic matter
Carbon from inorganic matter
Animals
Plants

Slide 7 - Drag question

Feeding relationships
  • Autotrophs: producers
  • Heterotrophs: consumers

Slide 8 - Slide

Food chain
  • Each step is a trophic level
  • Arrows represent energy transfer

Slide 9 - Slide

Food web
  • Show all feeding 
    relationships
  • Trophic level can
    depend on food chain
    you focus on. 
    Example: rattlesnake
    can be secondary or
    tertiary consumer

Slide 10 - Slide

Slide 11 - Slide

Producer
Primary consumer
Secondary consumer
Tertiary consumer

Slide 12 - Drag question

With reference to the following statements about a woodland ecosystem.
Which statement describes a community?
A
All the oak trees
B
All the plants
C
All the plants and animals

Slide 13 - Quiz

Organisms that are responsible for returning matter back into the environment are the
A
herbivores
B
carnivores
C
omnivores
D
decomposers

Slide 14 - Quiz

Organisms that only eat plants are called
A
herbivores
B
omnivores
C
scavengers
D
carnivores

Slide 15 - Quiz

In the food web shown which organism would be called an omnivore?
A
Grasshopper
B
Frog
C
Mouse
D
Fungus

Slide 16 - Quiz

In the food web which organism would have the largest population?
A
Eagle
B
Mouse
C
Frog
D
Grasshopper

Slide 17 - Quiz

2

Slide 18 - Video

01:28
What do the arrows in food chains and food webs represent?

Slide 19 - Open question

02:15
Energy lost
Three main reasons why only 10% of the energy passes to the next level:
  1. Energy is lost through respiration (being used by the organism)
  2. Not all the food is digested. There is still energy left in the undigested food
  3. Most of the time there will be parts of the organism that are not consumed. The parts that are left still contain energy

Slide 20 - Slide

Pyramids
Pyramids can be used to show a food chain and also include an extra piece of information.
You can have pyramids of numbers, biomass or energy.
Pyramids of numbers and biomass don't necessarily have a pyramid shape. The energy pyramid does, because only 10% of the energy carries to the next level.

Slide 21 - Slide

Slide 22 - Slide

Slide 23 - Slide

The primary source for all energy used by animals on our planet is
A
the animals they eat
B
the plants they eat
C
sunlight absorbed by animals
D
sunlight absorbed by plants

Slide 24 - Quiz

Which of the following statements about the flow of energy in nature is NOT true?
A
A major portion of the energy from food is used to keep our bodies warm
B
A large amount of energy in food is needed for bodily functions
C
Some energy from the food we eat is lost as wastes which are passed from the body
D
Most of the food energy from one trophic level is passed on to the next trophic level

Slide 25 - Quiz

Which of the following is NOT one of the ways energy is lost to other organisms as it passes through a food web?
A
Cellular respiration
B
Growth and repair
C
As heat
D
As waste material

Slide 26 - Quiz

What is the average amount of energy that passes from one feeding level to the next in a food chain?
A
10%
B
25%
C
50%
D
100%

Slide 27 - Quiz

Homework
Worksheet food chains

Slide 28 - Slide