ANIMALS

Invertebrates

Categorizing invertebrates

Animals are classifiee into 2 main groups that is:-

1. Vertebrates.
   1. Invertebrates.

Invertebrate

Are animals without backbone Examples

1. Bees
2. Flies
3. Grasshopper
4. Earthworm
5. Lobster
6. Snail
7. Millipeee
8. Fleas

Safety precautions to observe while handling invertebrates

Pupil’s activity Page 22-23

1. Do not touch the invertebrates. Some can sting or produce substances that can irritate the skin
2. Do not kill the invertebrates
3. Do not destroy the areas where the invertebrates live
4. Do not remove the invertebrates from where they live 5.

Identifying invertebrates found in the locality

Pupil’s activity Page 23-24

To observe and identify invertebrates

Pupil’s activity Page 23-24

Characteristics of different invertebrates

To discuss the characteristics of invertebrates

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To observe the characteristics of invertebrates

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Characteristics of insects

1. Insects have 3 body parts 1. Head, 2. Thorax, 3. Abdomen
2. Insects have 3 pairs of legs
3. Most insects have 2 pairs of wings. They use the wing for flying

Some insects such as beetles and ants do not have wings

• Insects have a pair of antennae on top of their heads.

Antennae are also known as feelers

Antennae are long, thin and are used for sensing. The body of an insect has a hard covering called exoskeleton

Characteristics of spiders and ticks

To discuss the characteristics of spiders and tick

Pupil’s activity Page 28-29

1. Spiders and ticks have 2 body parts
2. Spiders and ticks have 4 pairs of legs
3. Spiders and ticks do not have wings
4. Spiders and ticks do not have antennae

Characteristics of snails and slugs

To discuss characteristics of snails and slugs

Pupil’s activity Page 29-30

1. Snails and slugs have soft body
2. Snails and slugs do not have wings
3. Snails and slugs have 2 pairs of feelers on their heads. The feelers are also called receptacles
4. Snails and slays move by crawling on slimy mucus using the muscular foot The slimy mucus is produced by muscular foot

Snails have shells while slugs do not have shells.

Characteristics of centipedes and millipedes

To discuss characteristics of centiiedes and milliiedes

Pupil’s activity Page 30-31

1. Centipedes and miillipedes 㿨aie 2 bodty sections– 㿨ead and iruuns
2. T㿨e iruuns of boi㿨 miillipedes and centipedes is diiide inio mianty sections called segment

Centipedes and miillipedes 㿨aie mianty pairus of legs

• Centipedes 㿨aie one pairu of legs peru segmieni, one leg on eac㿨 side of i㿨e bodty.
• Millipedes have two pairs of legs per segment.
• The legs are positioned under the body
• Millipedes coil body when disturbed

1. Centipedes have one pair of antennae on the head

Importance of invertebrates to human beings

1. Source of food

Some insects such as termites are used as food by some people Bees produce honey which is used as food

• Pollination

Most flowering plants are pollinated by insects Pollination enables to produce seeds

• Cleaning the environment

Some invertebrates such as millipede feed on decaying matter turning it into compost. This helps to clean up the environment

The compost makes soil good for growing crops

NB Some invertebrates are harmful to human beings

Making a photo album of invertebrates in the locality

Pupil’s activity Page 32-33