1t Bricks 3.2 + 3.3 Sponges & Cnidarians

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

different types of skeleton

 Exoskeleton: Hard external skeleton found in insects, crabs, and other invertebrates.

Endoskeleton: Internal skeleton found in vertebrates like humans

Hydrostatic skeleton: fluid filled chamber (liquid is absorbed)

-worms and water slugs

How do we call animals without an endoskeleton?

Invertebrates with an exoskeleton are the......

How do we call animals with an endoskeleton?

PHYLUM

KINGDOM

Sponges

Molluscs

Worms

Cnidarians

Animals

Echinoderms

Arthropods

Vertebrates

INVERTEBRATES

ARTHROPODS

VERTEBRATES

Sponges

Molluscs

Worms

Reptiles

Mammals

Cnidarians

Crustaceans

Arachnids

Insects

Myriapods

Echinoderms

Fish

Birds

Amphibians

Finish the sentence; an aquatic animal is an animal that lives in ...

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

What is meant by the term 'fragmentation'?

practice makes perfect

different types of skeleton

 Exoskeleton: Hard external skeleton found in insects, crabs, and other invertebrates.

Endoskeleton: Internal skeleton found in vertebrates like humans

Hydrostatic skeleton: fluid filled chamber (liquid is absorbed)

-worms and water slugs

SYMMETRY

Which two types of symmetry do you see here?

Radially 
symmetrical

Bilaterally 
symmetrical

What type of symmetry does a jellyfish have?

1. radial symmetry
2. bilateral symmetry
3. asymmetry

What type of symmetry does a spider have?

1. radial symmetry
2. bilateral symmetry
3. asymmetry

PREDATOR-PREY

SYMBIOSIS

A special relationship 

when two organisms 

from different species 

live together. 

For example: nemo is a (clown) fish and lives together with an anemone which is a cnidarian. 

What does symbiosis mean?

1. living separately, no relationship between 2 species
2. living together, close relationship between 2 species
3. living in a community with no interaction between each other
4. living together in fear of each other

Characteristics

Skeleton

• hydrostatic

Reproduction

• sexual
• asexual

Symmetry

• radial