6.4 A cycle

• Biologie / Verzorging
• Middelbare school
• vmbo t, mavo, havo, vwo
• Leerjaar 1

6.4 A cycle

Schedule

Introduction

Learing objectives

Quiz questions

Instruction

Homework assignments

Quiz questions

Next lesson homework check

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The story of the Arctic fox

Grassland

Tundra

6.4 A cycle

Learning objective

You will learn where natural waste goes and you will learn about the functions of organisms in the food cycle.

A food chain always starts with a

1. Herbivore
2. Omnivore
3. Consumer
4. Plant

What is this?

1. Food cycle
2. Food web
3. Food chain
4. Biotope

Why does the biomass (weight) in the food pyramid decrease per level?

1. Each level extracts less and less energy from the food
2. Because there are more of the consumers
3. The individuals at higher levels weigh less
4. Because not all energy is captured in building components

Natural waste

• The litter layer consists of natural waste

• Soil animals eat natural waste

• Bacteria and fungi in the litter layer and humus layer convert the droppings of soil animals and the remains of natural waste into minerals.

Food cycle

1. Producers

The producers of glucose and other nutrients in the food cycle

2. Consumers

Animals and humans; the consumers of glucose and other nutrients in the food cycle

3. Detrivores (waste eaters)

Soil animals that eat the waste of producers and consumers in the food cycle

4. Decomposers (bacteria and fungi)

Fungi and bacteria that decompose the natural waste, so the minerals become available again for the producers

Why farmers fertilize their land

Because plants are harvested, there is hardly any waste available for the detritivores. 

Therefore, the decomposers cannot convert humus into minerals: the food cycle is broken!

Farmers use manure or chemical fertilizer to add minerals to the soil.

Homework

Chapter 6. Paragraph 6.4: A cycle

What? Make assignments 1 - 12

How? On your own. You may consult in a whisper.

Help? Raise your hand if you need my help.

Time? 15 minutes

Endresult? Your homework is ! Now you know more about natural waste and food cycles.

Finished? Check your answers and then work on the final task. 

What is the most important task of fungi and bacteria?

1. Making hyphae (schimmeldraden)
2. The difference between humus and the litter layer
3. Converting humus into minerals

Plants are.

1. Producers
2. Consumers
3. Decomposers
4. Detrivores

A mushroom is a...

1. Producer
2. Consumer
3. Decomposer

Why is a food cycle interrupted by harvesting?

1. The plants can't grow anymore
2. There will be no humus