Ecological pyramids

Revising Food Chains, Food webs and teh flow of energy

Multiple Choice

What is the ecological role of the seal?

• Primary Consumer
• Secondary Consumer
• Producer
• Tertiary Consumer

Multiple Choice

How much energy is passed on to the next trophic level?

• 100%
• 10%
• 1%
• 0%

Multiple Choice

What starts every food chain or food web?

• Producers
• Primary Consumers
• Secondary Consumers
• The Sun

Multiple Choice

If there are 100 KJ of energy available at the secondary consumer level, how many KJ of energy are available at the producer level?

• 10 KJ

• 1,000 KJ

• 10,000 KJ

• 1 KJ

Multiple Choice

Plants receive 4500 cal from the sun. How many calories will a primary consumer receive?

• 4500
• 4.5
• 45
• 450

Multiple Choice

What is the ecological role of the seal?

• Primary Consumer
• Secondary Consumer
• Producer
• Tertiary Consumer

Multiple Choice

Which of the following organisms are autotrophic?

• Flower
• Rabbit
• Wolf

Multiple Choice

What is the ecological role of the krill in this food chain?

• Tertiary Consumer
• Producer
• Primary Consumer
• Secondary Consumer

Multiple Choice

How do autotrophic organisms obtain their energy?

• Consuming other organisms.

• Converting solar energy into chemical energy.

Multiple Choice

How do autotrophic organisms obtain their energy?

• Consuming other organisms.
• Converting solar energy into chemical energy.

Ecological Pyramids

Objective

(e) describe and interpret pyramids of numbers and of biomass

Open Ended

Can you define a ecological pyramid....?

An ecological pyramid is a graphical representation of the relationship between the different living organisms at different trophic levels.

Types of ecological pyramids

• Pyramid of numbers

• Pyramid of biomass

• Pyramid of energy

Pyramid of numbers

• Upright (grassland)

• Inverted (woodland)

• Partially inverted (parasitic food chains)

Upright vs Inverted pyramid of numbers

inverted pyramid of numbers can be made for food chains from the woodland ecosystems

Partially inverted pyramid of numbers

Open Ended

construct a pyramid of numbers for this food chain

Multiple Choice

1. Why is it unusual for a large number of organisms to be present at the top of an ecological pyramid?

• A. Animals at the top of the pyramid are the largest.

• B. Animals at the top have shorter lives.

• C. The amount of energy available by the time the top of the pyramid is reached is not enough to sustain many individuals.

• D. Humans are most interested in hunting animals occupying the top level of the ecological pyramid.

Pyramids of biomass

These are more logical with reference to the actual amount of stored energy for the next trophic level

They can also be inverted - especially incase of aquatic food chains

Open Ended

Think and suggest one disadvantage that comes to your mind of the biomass pyramids.

Pyramid of energy

• A pyramid of energy shows how much energy is retained in the form of new biomass at each trophic level,

• These pyramids are always upright because, in order for the ecosystem to sustain itself, there must be more energy at lower trophic levels than there is at higher trophic level

Comparison of ecological pyramids

Multiple Select

Which kind of a pyramid of numbers does this figure seem to represent?

• inverted

• partially inverted

• upright

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https://www.youtube.com/watch?v=wGfOoRrICto