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Invertebrates REINFORCEMENT

Name 1

Date

Write the groups of invertebrates. Then, match them to the correct pictures.

a. They are simple aquatic invertebrates. They live attached to rocks. Their bodies are full of pores and are sac-shaped. They are

.

b. They have got poisonous tentacles and jelly-like bodies. Jellyfish are in this group. They are

.

c. They have got long, soft bodies and no legs. Thy live in soil, in water or inside other bodies. They are

.

d. Mussels, octopuses, squids and snails are in this group of invertebrates. They are

.

e. They are marine animals. Their skeleton is made of hard plates. Starfish and sea urchins are in this group. They are

.

f. They have got an articulated exoskeleton made up of external plates. Insects, arachnids, crustaceans and myriapods are in this group. They are 2

.

Circle the correct word. Invertebrates haven’t got a skeleton / spinal column.

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Natural Science 3

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REINFORCEMENT

3

Circle the correct words. a. Worms, insects and spiders are vertebrates / invertebrates. b. Mussels have got shells / exoskeletons. c. Crabs have got hard / soft exoskeletons. d. Jellyfish and earthworms have got / haven’t got a hard covering.

4

1

Complete the crossword about insects.

2 3

4

5

6 DOWN

5

ACROSS

1. These parts help insects feel and smell.

4. This part contains wings and legs.

2. These hatch from eggs.

5. This part is divided into segments.

3. Invertebrates with six legs.

6. Insects fly with these.

Complete the sentences about molluscs. Molluscs have got

bodies. Most of them have got one or two to protect their bodies.

Most of them are

, like clams, but some are

,

like snails and slugs. 6

Write one or two examples of each. a. molluscs that have got two shells b. molluscs that have got a single shell c. molluscs that have got limbs with suction cups

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Natural Science 3

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Invertebrates EXTENSION

Name

Date

Head-foot Cephalopods are animals such as squids, octopuses and cuttlefish. These sea creatures are unusual because their feet, which are actually long tentacles, surround their mouth and are attached to their heads. Cephalopod means head-foot. Did you know that the octopus is one of the most intelligent of all the invertebrates in the marine world? Octopuses also have excellent eyesight, although they cannot hear. An octopus’s soft body looks like a large bag. It lives on the ocean floor, and its eight tentacles help it to move about and catch food. An octopus moves by jet propulsion: it sucks water in, then squirts it out of its head so fast that it moves through the water! Octopuses protect themselves in two ways. They squirt dark ink which blinds their enemies so they have time to escape. They also change the colour of their skin so that they blend in with their surroundings. This helps them hide from their enemies.

1

Unscramble the words and find some examples of cephalopods. shuctitlfe

dsuisq a. 2

b.

otcpuoses c.

Write T (true) or F (false). Then, correct the false sentences. a. The octopus is one of the most intelligent invertebrates in the sea. b. Cephalopod means head-legs. c. Octopuses move by jet propulsion. d. Octopuses have an excellent sense of hearing. e. Octopuses have five tentacles.

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Natural Science 3

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Invertebrates Name

EXTENSION

Date

Honey bees Honey bees are flying insects that form colonies and live in beehives. They work together for the good of the community, and each bee belongs to a specialized group according to its work.

foto abeja

In a beehive, there is one queen whose role is to lay eggs to produce new bees. Drones are male bees that mate with the queen. Worker bees are the most numerous group. When they are young, they stay in the beehive to look after it and defend it. When they are older, they fly outside to collect nectar and pollen from flowers to make honey for their food. They are able to indicate to other bees where to find pollen by performing a special dance. Bees are necessary for plant reproduction because they transport pollen from one plant to another. They can visit over 2,000 flowers in a day!

1

Read the text and answer the questions. a. What is a beehive?

b. How many queens are there in a beehive?

c. What are drones?

d. What bees are in charge of collecting pollen and nectar?

e. Why are bees important for plant reproduction?

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Natural Science 3

49

Invertebrates ASSESSMENT

Name

Date

1

What do all invertebrates have in common?

2

Look at the illustrations and match. A

mollusc

D

arthropod

B

cnidarian

E

worm

sponge C

F echinoderm

3

Circle the correct word. Then, write the sentences. a. Jellyfish have tentacles / legs. Their bodies look like jelly / rocks.

b. Worms have soft / hard bodies. They are short / long.

c. Molluscs have hard / soft bodies. They usually have shells / scales.

d. Spiders have eight / six legs.

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Natural Science 3

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ASSESSMENT

4

Label the parts of the fly.

5

Number the illustrations in order.

A

6

B

C

D

Write T (true) or F (false). a. Echinoderms live attached to rocks. b. Sponges can live on land and in water. c. Jellyfish have poisonous tentacles. d. All worms are aquatic.

7

Write the group of arthropods these invertebrates belong to. A

B

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C

D

Natural Science 3

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Invertebrates TEST

Name 1

Date

Invertebrate animals… a. always live in warm places with high humidity. b. haven’t got a spinal column. c. have got long, soft bodies with no legs.

2

Sponges are… a. vertebrate animals that live in the sea. b. aquatic invertebrates that live attached to rocks. c. marine arthropods.

3

Jellyfish are… a. sponges.

4

c. cnidarians.

b. the soil.

c. trees.

Earthworms live in… a. the sea.

5

b. vertebrates.

Molluscs… a. are oviparous invertebrates with soft bodies. b. can only live attached to rocks in the sea. c. have got very bright colours.

6

Starfish and sea urchins are… a. arachnids.

7

c. arthropods.

Insects, arachnids, crustaceans and myriapods are all… a. arthropods.

8

b. echinoderms.

b. vertebrates.

c. herbivores.

Arthropods have got… a. many legs. b. an articulated exoskeleton. c. wings.

9

Insects’ bodies are divided into… a. head, thorax and abdomen. b. antennae, legs and wings. c. head, trunk and limbs.

10 Spiders have got…

a. ten legs. 52

Natural Science 3

b. eight legs.

c. six legs. Photocopiable material © 2014 Santillana Educación, S.L. / Richmond Publishing