Post on 18-Mar-2018
CLASSIFICATION
1. Classification is the grouping of organisms into groups based on ____________ or features. These features may be visible, or known.
2. Visible differences that are used to separate organisms into various groups include
a. Shapeb. Body structure
i. Two / three body s__________ii. Presence/absence of limbsiii. Number of l_______
c. Body coveringi. F______ii. S_______iii. F_________iv. hair
d. Method of locomotioni. Swimmingii. Flyingiii. Crawlingiv. Walking
3. Known features that are used to separate organisms into various groups include
a. Body temperatureb. Reproduction
i. Live birthii. Lays eggs
c. Respiratory organsi. Gillsii. Lungsiii. Tracheaiv. B_____ l______
4. Place the following into groups based on VISIBLE differences.
Use the following as guidelinesa. feathers / no feathers __________________________________
b. scales / no scales _____________________________________
c. legs / no legs _________________________________________
d. fins / no fins __________________________________________
5. Use KNOWN features to separate the same organisms. Use the following as guidelines
a. Warm blooded / cold blooded ______________________________
b. Moist skin / dry skin ____________________________________
c. Gills / no gills _________________________________________
d. Lays eggs / give birth to live young _________________________
6. Each feature can be further divided to separate the organisms into smaller categories. EG. “lays eggs” can be further divided into “lays eggs on land” and “lays eggs in water”/ eggs with soft, leathery or hard shells.
7. From the question above (d) fish, lizard, frog and pigeon lay eggs. a. Which lays eggs on land? _______________________________b. Which lays eggs in water? _______________________________c. Soft _______________, leathery __________, hard _________
Organisms are classified into groups
Different types of organisms can be identified based on their characteristics. Biologists group organisms based on the characteristics that they share. There are five main groups into which all organisms are placed. These groups are called _____________.
The five ___________ are
1. Prokaryotae (bacteria)2. Proctotista (amoeba)3. Fungi (mushrooms)4. Plantae5. Animalia
Within each kingdom organisms are grouped into phyla (singular phylum) and then classes.
Kingdom Animalia (animal)
Phylum
Annelida Mollusca Echinodermata Porifera Cnidaria Arthropoda Chordate
Class
Arthropodao Crustacean o Diplopodao Chilopodao Insecto Arachnida
Chordatao Pisces (fish)o Aves (birds)o Reptilia (reptiles)o Amphibia (amphibians)o Mammalian (mammals)
Phylum __________
These are corals, jellyfish and sea anemones. They all live in water because their soft bodies will dry out very quickly on land. They have a ring of tentacles surrounding the mouth. The mouth is the only opening in the digestive system – they have no anus.
Characteristics
Body wall made up of only two layers of cells Ring of tentacles with mouth at the centre Only one opening to gut.
Tentacles have sting cells which are used for catching prey
Coral polyp. Many join to make a large colonial organism.
Phylum _________________
These are starfish, sea urchins and sand dollars. They are found in the sea,
Characteristics
Five-part radial symmetry Body wall contains calcareous particles Many have a shell with projecting spines
Phylum _______________
These are animals with jointed legs, but no backbone. They have a waterproof exoskeleton which has allowed them to live on dry land.
Characteristics
Several pairs of jointed legs Exoskeleton
Class ________________
These are crabs, lobsters, and woodlice. They breathe through gills, so most of them live in wet places and many are aquatic.
Characteristics
Have more than four pairs of jointed legs
Breathe through gill antennae
Name some more examples below
crab
lobster woodlouse
Class __________________
These are spiders, ticks and scorpions
Characteristics
Have four pairs of jointed legs
Breathe through gills called book lungs
Spider
Class Myriapods has two sub classes
Class __________________
These are millipedes
Characteristics
Body consists of many segments
Each segment has two pairs of legs
Class ___________________
These are centipedes
Characteristics
Body consists of many segments
Each segment has one pairs of legs
Front segment has a large pair of poison claws
Both have antennae
Class _____________________
These are ants, moths, butterflies, cockroaches, locust, ladybugs, beetles, mosquitoes, bees and flies
Characteristics
Have three pairs of jointed legs
Three body segments Have two pairs of wings Breathe through trachea antennae
Phylum Chordata
These are animals with a supporting rod running along the length of the body. The most familiar ones have a backbone, and are called ______________.
Class Pisces
The fish all live in water with a few exceptions – the mudskipper can spend short periods of time breathing air.
Characteristics
moist scaly skin Have gills Have fins
Class Amphibia
Frogs and toads are amphibians.
Characteristics
Vertebrates with moist scale-less skin
Eggs laid in water, larva (tadpole) lives in water
Adult often lives on land Larva has gills adult has
lungs
Class Reptilia
These are crocodiles, lizards, snakes and turtles.
Characteristics
Vertebrates with scaly skin Lays eggs with rubbery shell Mostly adapted to live on
land
Class AvesThese are birds
Characteristics Vertebrates with feathers Forelimbs have become
wings Lay eggs with hard shells
Homeothermic/____________ Have a beak
Class Mammalia
These are humans, dogs, cats, rats, elephants, rabbits and whales,
Characteristics
Vertebrates with hair Have a placenta Young feed on milk from mammary glands Homeothermic Have a diaphragm Heart has four chambers Have different types of teeth Brain well developed
PLACING ORGANISMS INTO THEIR CORRECT GROUPS
We can use a dichotomous key system that uses a pair of features to classify organisms. They occur in two forms
1. Spider key {flow diagram}2. Number key {pairs of statements}
To decide whether an organism belongs to a particular group you can ask a question that requires a ‘yes’ or ‘no’ answer. In order to fully classify an organism you need to ask a series of questions.
Below is a simple flow diagram or spider key for classifying vertebrates
Questions
1.
.
Create a spider key and number key to classify the following
1.
2.
3.