ps : 4217 mot : science i
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PS : 4217 MOT : SCIENCE I. Unit 3 Classification Of Invertebrates. Presenter : Alice Lim Wen Pei 08B0916. Objectives By the end of the lesson, student should be able to : Define what is invertebrate State animals without backbone ( molluscs , annelids and arthropods) - PowerPoint PPT PresentationTRANSCRIPT
PS : 4217 MOT : SCIENCE I
Presenter : Alice Lim Wen Pei 08B0916
Unit 3 Classification Of
Invertebrates
Objectives By the end of the lesson, student should be able to :
Define what is invertebrate
State animals without backbone (molluscs, annelids and arthropods)
State the for types of arthropods (insects, arachnids, crustaceans and myriapods)
Give examples for each of the group
What is invertebrate?Animals without backbones.There are many groups of
invertebrates.The three important groups of
invertebrates are :
Molluscs (animals with shells)Annelids (segmented worms)Arthropods (invertebrates with
jointed legs)
Molluscs (animals with shells)
Have shellsHave soft bodies and a muscular foot
Have tentaclesExamples : Snail, Octopus and Mussel
Snail
Octopus
Mussel
Annelids (segmented worms)Body is divided into segments (parts)
There are bristles on the segmentsExamples : Earthworm, Leech and Ragworm
Earthworm
Leech
Ragworm
Arthropods (invertebrates with jointed legs)
Bodies have three parts :i. Headii. Thoraxiii.Abdomen
Have a hard exo-skeleton (skeleton on the outside of the body)
Can be divided into 4 types :1. Insects – 3 pairs of legsExamples : Bee, Mosquito, Cockroach
Mosquito
Bee
2. Arachnids – 4 pairs of legsExamples : Spiders and Scorpions
Spider
Scorpion
3. Crustaceans – eight to ten legs Examples : Crabs, Prawns and Lobsters
Crab Prawn
4. Myriapods – many legs Examples : Centipedes and Millipedes
Centipede Millipede
Exercise
SUMMARY :What is invertebrate ? - Animals without backbone.
What are the three main group of invertebrates? - Molluscs, Annelids and Arthropods.
Example for :Molluscs – SnailAnnelids – EarthwormArthropods – Grasshopper
Arthropds can be classify into 4 types. What are they?
- Insects - Arachnids - Crustaceans - Myriapods
Thank you for listening