SCIENCE-Unit 3: Invertebrates

Unit 3: OTHER GROUPS OF INVERTEBRATES

INDEX:

1.       Common characteristics

2.       Invertebrate animals with protective covering.

                   Echinoderms

3.       Invertebrates animals without protective covering.

                    Worms

                    Sponges

                    Jellyfish, anemones and corals

1.- COMMON CHARACTERISTICS ____________________________

-         An invertebrate is an animal without a backbone.

-         All Invertebrate animals are oviparous: they are born from eggs.

-         Some protect their bodies with shells or hard skin: molluscs, arthropods and echinoderms.

-          Others have no protection:  worms, sponges, jellyfish, anemones and corals.

2.- INVERTEBRATE ANIMALS WITH PROTECTIVE     

     COVERING._______________________________________________

 ECHINODERMS

-         Echinoderms are invertebrate animals that have bodies with a radial symmetry .

-         They live in the sea, they are aquatic animals that move slowly along the sea floor.

-         Some have their body covered with hard pieces that protect their body, like the starfish.

-         Some have their body covered with spines, like the sea urchin.

3.- INVERTEBRATE ANIMALS WITHOUT PROTECTIVE 

     COVERING._______________________________________________

-         They have soft body.

WORMS

-         Worms are invertebrates with long, soft bodies. Their bodies are usually ringed.

-         Some are terrestial, they can live on land called earthworms. Others are aquatic, they live in the water called sea worms.

-         Some are parasites. They get into people´s stomachs when they eat or drink food contaminated with worm eggs. To avoid catching intestinal worms, wash fruit and vegetables well and wash your hands before you eat.

SPONGES

-         Sponges are invertebrates with soft, irregular bodies full of pores.

-         Sponges look like plants but they are animals.

-         They are aquatic, they live in water.

-         Sponges can not move. They stay fixed on the rocks in the ocean.

-         They eat the substances that they filter through their pores.

JELLYFISH

- They have soft bodies and tentacles.

- They are aquatic and most live in warm water.

- They float in the sea.

ANEMONES 

-         They have soft bodies and tentacles.

-         They are aquatic and most live in warm water.

-         They live on rocks.

CORALS

- They have a hard covering.

- They are aquatic and most live in warm water.

- They live on rocks.

ACTIVITIES

1.-Match the group of invertebrates with their characteristics.

Worms                                   They have soft bodies with pores.

Poriferia                                 Hard pieces cover their bodies.

Echinoderms                         Some live on the rocks and other float in the sea.

Jellyfish, anemones              Some are parasites.

and corals

2.- Fill the gap.

Poriferia have ……………… bodies with lots of ……………, like sponges.

They eat the ……………….. that they …………filter through their pores.

They are ………………. and most live on the ……………. in the sea.