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INVERTEBRATES
INVERTEBRATES
1. PRESENTATION OF INVERTEBRATES
1. PRESENTATION OF INVERTEBRATES
20-21_Invertebrates.pdfHere you have the presentation of invertebrates. It is not based exactly on your book, but images could help studing. You should study from your book, notes and activities.
At the end you have a little test
2. CLASSIFICATION OF INVERTEBRATES
2. CLASSIFICATION OF INVERTEBRATES
THE MAIN GROUPS OF INVERTEBRATES ARE:
Sponges = Porifera
Cnidarians
Worms
Molluscs
Arthropods
Echinoderms
2.1. PORIFERA= SPONGES
This interesting video shows the flow of water created by the sponges to filter the water. Thus, they obtain nutrients and oxygen.
This video shows several types of sponges. They are animals!!!!
They don't move, the are attached to the seabed (they are sessile).
2.2. CNIDARIANS
Easy explanation about cnidarians
CNIDARIANS REPRODUCTION CYCLE: There are two phases in the reproductive cycle:
Asexual phase: carried by the polyp stage
Sexual phase: by the medusa phase
You can see another representation of the cycle here
REPRODUCTION IN CNIDARIANS
Watch this video and answer the following questions:
What are male corals releasing at the beginning of the video?
What are female corals releasing?
Where are the fertilized eggs going?
CORAL REEFS
FOR FURTHER INFORMATION:Curiosities and characteristics about cnidarians
2.3. WORMS
2.3.1. FLATWORMS
Ask your relatives what they know about " la Tenia" o "Solitaria". This is the tapeworm, a curious flatworm....
2.3.2. NEMATODES
Ask your relatives what they know about the ANISAKIS
2.3.2. ANNELIDS
Earthworms
Feather duster worms
What do leeches feed on?
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