EES_Y3_LSN7E

• Biologie
• Middelbare school
• vwo
• Leerjaar 3

EES_Y3_LSN7

Evolution, Ecology & Sustainability

Lesson 8 - ENERGY & NUTRIENT TRANSFER: 

P.  338-343 

Learning goals:

• I can explain and interpret what food chains and food webs are.
• I can draw my own food chain & food web based on a text/diagram.
• I can name and explain the various roles within a food chain/web.
• I understand what trophic levels are and how they work. 
• I know and understand what pyramids of numbers and biomass are.

Keywords:

• Trophic levels
• Pyramids (biomass, energy & numbers)
• Energy flow
• Energy intake
• Autotroph
• Heterotroph
• Producer
• Consumer
• Primary consumer
• Secondary consumer
• Tertiary consumer
• Decomposer
• Apex predator
• Foodchain
• Foodweb

With reference to the following statements about a woodland ecosystem.
Which statement describes a community?

1. All the oak trees
2. All the plants
3. All the plants and animals

Organisms that are responsible for returning matter back into the environment are the

1. herbivores
2. carnivores
3. omnivores
4. decomposers

Organisms that only eat plants are called

1. herbivores
2. omnivores
3. scavengers
4. carnivores

In the food web which organism would have the largest population?

1. Eagle
2. Mouse
3. Frog
4. Grasshopper

Feeding relationships

• Autotrophs: producers
• Heterotrophs: consumers

Food chain

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

Food web

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

With reference to the following statements about a woodland ecosystem.
Which statement describes a community?

1. All the oak trees
2. All the plants
3. All the plants and animals

Organisms that are responsible for returning matter back into the environment are the

1. herbivores
2. carnivores
3. omnivores
4. decomposers

Organisms that only eat plants are called

1. herbivores
2. omnivores
3. scavengers
4. carnivores

In the food web which organism would have the largest population?

1. Eagle
2. Mouse
3. Frog
4. Grasshopper

Producer

Primary consumer

Secondary consumer

Tertiary consumer

01:28

What do the arrows in food chains and food webs represent?

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

Photosynthesis

Respiration

Carbon Cycle

The primary source for all energy used by animals on our planet is

1. the animals they eat
2. the plants they eat
3. sunlight absorbed by animals
4. sunlight absorbed by plants

Which of the following is NOT one of the ways energy is lost to other organisms as it passes through a food web?

1. Cellular respiration
2. Growth and repair
3. As heat
4. As waste material

What is the average amount of energy that passes from one feeding level to the next in a food chain?

1. 10%
2. 25%
3. 50%
4. 100%

Lesson 8 - ENERGY & NUTRIENT TRANSFER: 

P.  338-343 

Homework:

-Read your book

-Study keywords

-Make exercises on page 353 and 354

Keywords:

• Trophic levels
• Pyramids (biomass, energy & numbers)
• Energy flow
• Energy intake
• Autotroph
• Heterotroph
• Producer
• Consumer
• Primary consumer
• Secondary consumer
• Tertiary consumer
• Decomposer
• Apex predator
• Foodchain
• Foodweb