3.4 Worms

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

3.4 Worms

characteristics of worms

3-types of worms

food intake by worms

How do we call animals without an endo- or exoskeleton?

INVERTEBRATES

ARTHROPODS

VERTEBRATES

Sponges

Molluscs

Worms

Reptiles

Mammals

Cnidarians

Crustaceans

Arachnids

Insects

Myriapods

Echinoderms

Fish

Birds

Amphibians

What is meant by the term 'fragmentation'?

What type of symmetry is this? 

RADIAL SYMMETRY / BILATERAL SYMMETRY / NO SYMMETRY

An animal that eats other animals is called a ...

A special relationship between two organisms of different species in a long-term interaction is called ...

Which of the following statements about SPONGES is NOT correct?

1. Sponges are attached to rocks or corals
2. Some sponges feel like rubber
3. Sponges eat by filtering water
4. Sponges can only reproduce asexually

Which of the following statements about CNIDARIA is NOT correct?

1. Cnidaria are always attached to rocks or corals
2. Many cnidaria are predators that eat prey
3. Cnidaria have tentacles with stinging structures
4. Anemones are examples of cnidaria

The organism on the picture is a(n) ...

1. sponge
2. polyp
3. cnidarian
4. anemone

The organism on the picture is a(n) ...

1. sponge
2. polyp
3. cnidarian
4. anemone

The organism on the picture is a(n) ...

1. sponge
2. polyp
3. cnidarian
4. anemone

The organism on the picture is a(n) ...

1. sponge
2. polyp
3. cnidarian
4. anemone

3.4 Worms

characteristics of worms

3-types of worms

food intake by worms

Worms

tweezijdige symetrisch

geen skelet

lichaam is lang en dun

Worms

• long and thin bodies
• no skelet
• mostly bilateral symmetric

3-types of worms

segmented worms

What do you think about when you hear the word 'parasite'?

roundworms

• some are parasites
• roundworm infection 
• live in soil (contaminated faeces = poo)

FLATWORMS

page 64

• Invertebrate animals with a liquid skeleton.
• They have a flattened body with a mouth at one end. 
• Some live in fresh water, but most are parasites of animals, such as a human tapeworm.

Vertebrate or Invertebrate? Type of skeleton?

Specific for flatworms?

FLATWORMS

SEGMENTED WORMS

ROUNDWORMS

Most simple body plan

Live in water

Absorb nutrients through their skin

Live in soil and poo

Have a smooth & round body

Also called ringworm

Some are parasitic

Live in and eat soil

Their body is made up of ring-like structures

Some are parasitic

WORK ON THE LEARNING GOALS FOR 3.4 'WORMS'

Make a SIF & PIF

Make flashcards

Make a mindmap 

Make a summary

Make a quiz to test yourself

Worms (Wormen)

• Flatworm: long flat body, one opening, live in water
• Roundworm: long threadlike body, live in soil
• segmented worms: long body with segments, live in the sea or soil.

Flatworms and roundworms can be parasites.