unit: invertebrate animals1º eso biology and geology … · unit: invertebrate animals1º eso...
TRANSCRIPT
UNIT: INVERTEBRATE ANIMALS 1º ESO BIOLOGY AND GEOLOGY 2015/2016
What do they have in common?
What are their differences?
What is the theme for the next unit?
Vertebrates and Invertebrates
1
Label the animals with the pictures : Blue Whale Crab Monkey Owl Earthworm Frog Starfish Octopus
Fun Facts about Invertebrates
• Around 23% of all marine organisms are mollusks. • The only hard body part of an octopus is a hooked beak at the end of its tentacles. • Some invertebrates, such as echinoderms, do not have heads. • There are likely millions of invertebrates living in your house right now. They are
called dust mites and you can't see them. • When a crustacean outgrows its shell, it sheds the shell and grows a new one. • Lobsters, crabs, and shrimp all have 10 legs. The front two legs have pincers they
can use to catch food and fight off predators. • Some scorpion mothers protect their young by carrying them on their backs. • Centipedes are carnivores which eat insects and worms. They have a poisonous bite
to help them kill their prey. Millipedes are herbivores who eat plants and rotting material.
2
WORDSEARCH
3
PORIFERA or SPONGES
Lives in aquatic environments, mostly marine. All are filter feeders. They have an internal cavity and an upper hole called osculum. All are sessile Reproduction : sexual and asexual CNIDARIA They have a soft body. Body contains an internal cavity ( gastrovascular cavity) connected to the mouth. The mouth is surrounded by tentacles. Two different forms exist, Jellyfish ( can swim ) and polyp ( are sessile) Reproduction : sexual and asexual.
4
WORMS Animals with a soft and elongated body. The most importants are : Phylum Platyhelminthes ( flat worms ) , Phylum Nematoda ( Nematodes ) and Phylum Anelida ( annelids, earthworm) Phylum Platyhelminthes ( flat worms )
They have got a long, flat, soft body. Tapeworms have got a body divided into
rings. Some species occur in all major habitats,
including many as parasites of other animals.
Taenia is a parasite that lives in human intestines.
Reproduction: sexual ; hermaphrodites ( have both male and female sex organs; can fertilise themselves) Phylum Nematoda ( Nematodes ) http://www.earthlife.net/inverts/nematoda.html
Bodies are soft and cilindrical. Live just about everywhere, many species are endoparasites. Reproduction : sexual
Phylum Anelida ( annelids, earthworm)
Soft and cilindrical body. The body is divided in segments. Earthworm breathe through the skin. Live in most environments. Reproduction: sexual.
5
MOLLUSCS Include aquatic and terrestrial invertebrates. Molluscs have these main characteristics: Head, contains sense organs. Body mass, has the main organs. Muscular foot, is used for moving, excavating. Shell, one or two valves, no shell.
How many groups of molluscs are there? Gastropods, Bivalves and Cephalopods.
Gastropods: spiral shaped shell. Examples: snails, sea snails and slugs.
SNAIL SLUG
Bivalves: The shell has two valves. Examples: clams, mussels, oysters. CLAM OYSTER
Cephalopods: they have tentacles. Examples : squid ( internal shell); Octopus.
SQUID
6
ARTHROPODS There are more than one million of species. They live in sea water, fresh water and on land. The main characteristics are:
Body is covered by a rigid and articulated exoskeleton. Body is divided into segments: head, thorax and abdomen. Some of them have cephalothorax ( head + abdomen) Jointed appendages: legs, antennae, wings. Reproduction: sexual. Oviparous. Metamorphosis.
How many groups of arthropods are there? Crustaceans, Myriapods, Arachnids and Insects
Groups Examples Body/Appendages Habitat
Crustaceans Lobster, Crab, Shrimp
10 legs aquatic
Myriapods Centipede, Scolopendra
wormlike body, many legs
terrestrial
Arachnids Spider, Scorpion 8 legs terrestrial
Insects Butterfly, ant, bee, wasp
6 legs, 2 antennae, 2 or 4 wings, no wings
terrestrial, some aquatic
LOBSTER SHRIMP SCOLOPENDRA
SPIDER ANT WASP
7
ECHINODERMS
They are marine invertebrates. They have the ambulacral system. The main function of the ambulacral system is locomotion. Echinoderms have different forms: rounded, cylindrical or like a star. Examples: starfish, sea urchins, sea cucumbers and brittle stars.
SEA URCHIN SEA CUCUMBER BRITTLE STAR
LISTENING : https://www.youtube.com/watch?v=rzxFTrktN1c 1Fill in the blank: The ____________________ have an internal skeleton formed by __________, and the _____________________ that have no _______________.
2Name 3 groups of invertebrates. 3Fill in the blank: Many of the _____________ we use in the shower are invertebrate animals. 4 Fill in the blank: Worms are soft and long invertebrate animals that move by dragging their ____________ in the ground because they have no ___________. 5Fill in the blank: Some mollusks like snails, clams or mussels, protect their soft body with ________________. 6 The echinoderms that have a star shape are called _______________. 7Fill in the blank: The ________________ are the most abundant animal on the earth.
8
Game : http://sciencenetlinks.com/interactives/class.html
Activity: In groups, look at the pictures and decide what type of invertebrate they are. Write your answers in your
notebooks. What type of invertebrate are they?
9
Activity Give examples of these invertebrates
Porifera Worms Arthropods Cnidaria Molluscs Echinoderms RESOURCES http://www.earthlife.net/inverts/platyhelminthes.html http://www.earthlife.net/inverts/porifera.html http://www.earthlife.net/inverts/cnidaria.html http://www.earthlife.net/inverts/porifera.html https://www.youtube.com/watch?v=rzxFTrktN1c http://sciencenetlinks.com/interactives/class.html
10