UNIT 4. INVERTEBRATES ACTIVITY SHEET

1) What’s the main difference between vertebrates and invertebrates animals?

2) “Invertebrates don’t have skeleton”. Is it true? What kinds

of skeleton do you know?

3) How do sponges feed? Explain it, and label this picture

4) Which group of cnidaria can move? Which one cannot?

5) What are cnidoblasts used for?

6) Draw a picture of a jellyfish body structure. What do they

eat?

7) Complete this paragraph:

Cnidaria includes __________ and __________. ___________ reproduce sexually, and they

produce a ____________. ____________ reproduce asexually. They loose a part of their body,

and this part becomes a new ___________.

8) Complete this chart about worms:

Body shape Do they

have rings? Habitat

Heterosexual or

Hermaphrodites Respiration

Nematodes

Playhelminthes

Annelids

9) Which groups of echinoderms do you know? What do they eat?

10) Do Echinoderms have skeleton? Which type?

11) Why are useful the ambulacral system, and the ambulacral

feet?

12) Label the picture of a sea star

13) Which invertebrates groups do these animals belong to?

14) Answer these questions about molluscs:

a. Which ones have a spiral – shaped shell?

b. Which ones have a shell with two valves?

c. Which ones have tentacles?

15) Most molluscs are hermaphrodite. What does it mean?

16) Label this picture using these words

shell – muscular foot – body mass – tentacles – eyes

17) What kind of skeleton do arthropods have?

18) Complete this paragraph:

“Arthropods usually have _________ parts in their body: ________, ________, and

__________. In some arthopods, the __________ and the _________ are joined, forming the

________________.”

19) Explain the metamorphosis of an arthropod.

20) What do arthropods do when their skeleton gets too small?

21) How do arthropods breathe?

22) Complete this chart about arthropods:

Group Nº of Legs Habitat Do they have

wings? Example

6

8

10

Many

23) Which groups of invertebrates do these animals belong to?