YR1_T2_LSN1

• Science
• Middelbare school
• havo, vwo
• Leerjaar 1

HAVE READY

• YOUR TEXTBOOK
• YOUR NOTEBOOK
• A PEN/MARKER
• YOUR MACBOOK (JOIN THIS LESSONUP) 

TOPIC 2: Being in the world 

In this topic you will learn about food chains, molecules in food, the digestive system, combustion inside and outside the body.

p. 45-89

Check out Study Go

A wordlist for every lesson.

TOPIC 2.1: FOODCHAINS

• I understand and can read food chains
• I can distinguish the different roles in a food chain 
• (producer, primary consumer, secondary consumer, tertiary consumer and quaternary consumer)
• I understand the energy pyramid and understand why energy gets lost

p. 46-53

TOPIC 2.1: FOODCHAINS

• organism
• photosynthesis
• joule (or calorie)
• foodchain
• energy flow
• producers
• primary consumer
• secondary consumer
• tertiary consumer
•  foodweb
• sustainable

TOPIC 2.1: FOODCHAINS

A food chain shows you who eats whom in an easy way.

The energy flow is shown with arrows

TOPIC 2.1: FOODCHAINS

Producers are plants, because they produce food with photosynthesis

Consumers are animals that eat other organisms.

We use the words primary, secondary and tertiary to describe if they are the first, second or third consumer in the chain

TOPIC 2.1: FOODCHAINS

The energy pyramid shows that you lose energy with every step in the food chain. 

This is because:

Consumers don’t eat the entire organism

Organisms use up some of the energy 

Organisms produce waste that has some energy. 

Homework exercises

Let's take a look at them together.

p. 48

PRODUCERS

CONSUMER

FOODWEB

FOODCHAIN

Shows one possible path of energy flow

Organism that feeds on other organisms

Shows all feeding relationships in an area

Organism that uses photosynthesis

Explain what the arrows in a food chain and food web represent.

What type of organism will always be at the start of a food chain?

What is the origin of all the energy you find in your food? (Hint: think about the process that the organisms from question 3 perform)

In class activity

Follow the instructions on the worksheets.

Assignment 1 - R:

Photo of group 1: Decomposers 

Assignment 1 - R:

Photo of group 2: Producers

Assignment 1 - R:

Photo of group 3: Primary consumers

Assignment 1 - R:

Photo of group 4: Secondary & Tertiary consumers

Assignment 2 - T1:

Find the requested food chains in the food web, even lay the cards out if it helps and write them down below, please do not include decomposers. 

1.  Find a food chain in which the Hawk is a tertiary consumer:
2. Find a food chain in which the Hawk is a secondary consumer:
3. Find a food chain with a Tarantula:
4. Find a food chain in which the Rattlesnake is a secondary consumer:
5. Find a food chain of 5 trophic levels:

Assignment 2 - T1:

1. Find a food chain in which the Hawk is a tertiary consumer:

GRASS --> GRASSHOPPER --> LIZARD --> HAWK

2. Find a food chain in which the Hawk is a secondary consumer:

GRASS --> RABBIT --> HAWK

3. Find a food chain with a Tarantula:

STARCACTUS --> KANGAROO RAT --> TARANTULA --> RATTLESNAKE --> HAWK

4. Find a food chain in which the Rattlesnake is a secondary consumer:

GRASS --> RABBIT --> RATTLESNAKE --> HAWK

5. Find a food chain of 5 trophic levels:

GRASS --> GRASSHOPPER --> LIZARD --> RATTLESNAKE -->  HAWK

Assignment 3 - T2:

Answer the following question about a new situation in our desert ecosystem. A virus destroyed the Kangaroo rat population in the summer of 2018, causing its extinction in this ecosystem. No need to include decomposers.

1. Which organisms would be directly affected by this extinction? (one step)

2. Which organisms would be indirectly affected by this extinction? (two steps)

3. Which of the above 7 organisms will increase in numbers?

4. Which of the above 7 organisms will decrease in numbers?

DIRECTLY AFFECTED:

STARCACTUS

TARANTULA

RATTLESNAKE

HAWK

INDIRECTLY AFFECTED: 

RABBIT

GRASHOPPER

RATTLESNAKE

LIZARD

INCREASE:

STARCACTUS

RABBIT

GRASHOPPER

DECREASE: 

TARANTULA

RATTLESNAKE

HAWK

LIZARD

TOPIC 2.1: FOODCHAINS

• I understand and can read food chains
• I can distinguish the different roles in a food chain 
• (producer, primary consumer, secondary consumer, tertiary consumer and quaternary consumer)
• I understand the energy pyramid and understand why energy gets lost

p. 46-53

TOPIC 2.1: FOODCHAINS

• organism
• photosynthesis
• joule (or calorie)
• foodchain
• energy flow
• producers
• primary consumer
• secondary consumer
• tertiary consumer
•  foodweb
• sustainable