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Invertebrates 1. Invertebrates have no ______________ 2. They make up ______% of the animal kingdom. 3. There are ______ groups 3. They are _________cellular. 4. Their nutrition is __________. 5. Their reproduction is _________. What will talk about in the next weeks? - PowerPoint PPT Presentation
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InvertebratesInvertebrates
1. Invertebrates have no ______________
2. They make up ______% of the animal kingdom.
3. There are ______ groups
3. They are _________cellular.
4. Their nutrition is __________.
5. Their reproduction is _________.
What will talk about in the next weeks?1. What are the different groups of invertebrates?
2. What are the characteristics of these groupsnutritionreproductionhabitatscientific name
3. Evaluation: At the end we will have an exam
Group 1 Sponge
Scientific name: Porifera
A Sponge never moves. It stays in the same place all its life.
It reproduces sexually. The male and female release the sperm and ova into the
water to make a new sponge.
It lives in salt-water, in the seas and oceans all around the world.
How does it feed?Look at the diagram.
Water moves through
the holes. The
sponge takes the
nutrients and then
the water leaves the
sponge.
http://www.youtube.com/watch?v=T7E1rq7zHLc
Group 2: Coral, hydras and jellyfish
Scientific name: Cnidaria
What do they all have in common?1. They all can sting, and the jellyfish is sometimes toxic to humans
2. They hunt their food. They catch it in their tentacles and then eat
it.
3. The have one hole that serves as a mouth and anus!
What are the differences?Hydra and coral do not move, jellyfish can move.
Hydra have asexual reproduction-budding
Jellyfish and coral use sexual reproduction
Jellyfish and Coral live in warm seas, hydras live in ponds
JellyfishTentaclesTentacles
One hole-mouth and anusOne hole-mouth and anus
Group 3 Worms-divided into
three
Group 3a Segmented worms
Scientific name : AnnelidThese worms' bodies are formed of ring like segments-earthworm
They are hermaphrodites-they can be both male and female
They have a head and a tail, and their body is moist to help movement
They eat decaying plants and animals.
They live in the ground
Why are they important?
SegmentsSegments
HeaHea
dd
TailTail
Group 3b Round worms
Scientific name: Nematoda
These worms cannot move very well
They taper to the end
They reproduce sexually
All in the pictures are parasites, they live in other plants or animals,
including humans
Parasite
A worm A worm
living in living in
someones someones
eyeeye
This is a tape worm. It was This is a tape worm. It was
living in a cow's intestineliving in a cow's intestine
Group 3c Flat worm
Scientific name: Plathhelminthes
These are the most primitive of the worms
They reproduce sexually
Most have a mouth but no anus!
Most of this group are parasites.
This is a liver This is a liver
fluke. They fluke. They
are very are very
dangerous to dangerous to
farm animalsfarm animals
These worms live in the seaThese worms live in the sea
Group 4 Sea Urchin and Star Fish Scientific name: Echinoderms
These animals are fixed or they move very slowly. They have spines to protect themselves.They lived in salty water. They do not have a head, and the mouth is on the underside.They are carnivorous and eat small crustanceans or molluscs. The reproduce sexually, by eggs and some species are hermaphrodite.
Mouth on Mouth on undersideunderside
Spines for Spines for protectionprotection
Starfish eating
Army of Sea Urchins -
From one leg, a star fish From one leg, a star fish can regenerate his can regenerate his whole body!whole body!
Group 5 Molluscs
Every mollusc has these similarities:
A head-it contains head and eyes and mouth
A body with all the main organs
A foot which helps them move about
They can be carnivores or herbivores
They reproduce sexually, with eggs. They are also hermaphrodite.
Most have a shell of one or two valves
Head and eyesHead and eyes
ShellShell
FootFoot
There are three groups.
1.1. GastropodsGastropods-slugs, snails and sea snails. They have a shell, except the ______
2.2. BivalvesBivalves-clams, cockles, mussels. Their shell has two valves.
3.3. CephalopodsCephalopods-squid, cuttlefish and octopi. They have tentacles, but no_______
Shark vs. Octopus
Quagga Mussels Feeding
giant slug eats flower
Group 6: Arthropods
Scientific name: Arthropods
What do they have in common?
Their segmented body is divided into three parts-head, thorax and abdomen.
They all have antennae on their head
They reproduce sexually by eggs.
They moult-this means their old skin falls off and they then grow a new one.
Each group has its own characteristics
How many groups are there?
Group Examples Body Habitat
Crustanceans legs
Myriapods centepede worm-like, many legs
Anrachnids legs
Insects legs, antennae2 or 4 or no wings
Some videos on Arthropods
YouTube - A Huge Centipede Fighting A Snake YouTube - BIG spider - tarantula on my hand