1.4 CLASSIFYING INVERTEBRATE ANIMALS

Question 1

What is an invertebrate animal?

Answer 1

Animals with no backbones and are usually small

Question 2

Molluscs

Answer 2

1. Muscular body
2. No legs
3. May have tentacles
4. Have a shell
5. Some live on land (slugs, snails)
6. Some live underwater (squids, octopuses)

Question 3

Annelids

Answer 3

1. Segmented body
2. No legs

Question 4

Cnidaria

Answer 4

1. Live in the sea
2. No legs
3. Have stinging tentacles

Question 5

Nematods

Answer 5

1. No segmented body
2. No legs

Question 6

Echinoderm

Answer 6

1. Have spiky skin
2. Star- or ball- shaped

Question 7

Arthropods

Answer 7

1. Crustaceans
   - Have shell
   - Have two feelers (antennae)
   - Have compound legs
   - Four pairs of legs and one pair of claws
2. Myriapods
   - Have many legs (1 or 2 per segment)
   - One pair antennae
3. Arachnids
   - Have two part body
   - Have four pairs of legs
4. Insects
   - Have three part body
   - Have three pairs of legs
   - Have one pair of antennae
   - Have two pairs of wings