Grade 7 classification of Animals
Classification of Animals
Animals are classified into two groups vertebrates and invertebrates
Vertebrates
Vertebrates are animals with backbone.
Examples of vertebrates
Fish, mammals, reptiles, amphibians, birds
Invertebrates
Invertebrates are animals without backbone.
- Coelenterates - sea anemone
- annelids – earthworms, leeches
- echinoderms – starfish, sea urchins, sea cucumbers
- mollusks – snails, octopi, squid, snails, clams
- arthropods – insects, spiders, crustaceans such as shrimp, crabs, lobsters
Vertebrates
FISH
The body of the fish is covered in scales and has fins attached to help it move through the water. Fish breathe using gills which take oxygen out of the water. When male and female fish mate, the eggs often meet the sperm in the water. This is called external fertilization. Examples of fish are the herring, Goldfish, Guppy, Northern pike, Wels catfish, Barramundi, Atlantic cod.
AMPHIBIANS
The skin of amphibians is very thin and must always be kept wet because amphibians breathe through their skin. They do have lungs, but their lungs are small and are not used very much. Fertilization of the eggs is external, taking place in the water. The eggs are covered with jelly to protect them. The adult amphibian which lives on land but always near water. Examples of amphibians are the frog, Salamander, Caecilian, Amphiuma, labyrinthod ontia.
REPTILES
The body of a reptile is covered in hard scales. Reptiles live on land, although many of them swim well and may feed in water, such as some snakes and lizards. They breathe using lungs. When male and female mate fertilization is internal. The female lays soft-shelled eggs which are often buried in sand or in the earth to protect them while the young develop inside. Examples of reptiles are crocodiles, snakes, Turtle, Lizard, Dinosaur, chameleons.
BIRDS
Birds have bodies covered with feathers. They do not have teeth but use their beaks to eat their food. Their front limbs are adapted as wings, although not all birds fly. Birds breathe using lungs. Fertilization is internal and the females lay eggs with hard shells, usually in a nest. Most birds incubate their eggs until the eggs hatch. Examples of birds are the stork, eagle,Parrot, Pigeons, Owl, Swallow, Finches, Sparrow, Penguin.
MAMMALS
All mammals have a body covering of either hair or fur. They breathe using lungs. Fertilization is internal and the females feed their young with milk from their mammary glands. Most mammals are viviparous. This means that the offspring are kept inside the female's body and feed through a placenta. The largest mammal lives in the sea, it is the blue whale. The smallest mammal is called the bumble bee bat. examples of mammals are Rodent, Cetaceans, Bat, Primate, Bear, Deer, human beings, Lion, Cow, Bison.
Activity
1.Which group is the odd one out?
A. Goldfish, sardine, flying fish
B. Frog, toad, gecko
C. Human, goat,cat
D. Lizard,snake, crocodile
2. Which statement is not correct?
A. Fish are the only vertebrate group in the sea.
B. Mammals feed their young on milk.
C. Only birds fly using their feathers.
D. Amphibians are the only group with tadpoles.
3. Which vertebrates group has hair?
A. Birds
B. Amphibians
C. Reptiles
D. Mammals
4. Which vertebrate group does NOT have four limbs?
A. Fish
B. Amphibians
C. Reptiles
D. Mammals
5. Which group of vertebrates humans belong? Please state the characteristicstics.
6. Describe how you would separate vertebrates into smaller groups. What are the most important characteristics you would use?
Reference
Comments
Post a Comment