Classification of organisms. The grouping of objects or information based on similarities Taxonomy: branch of biology that classifies organisms

Transcription

1 Bell Work: Think about your CD, video game, DVD or book collection at home. How would you separate this collection into different groups? What would the groups be? Try to come up with 4 or 5.

2 Classification of organisms The grouping of objects or information based on similarities Taxonomy: branch of biology that classifies organisms

3 Carol Linnaeus Created the classification system we use today based on similarities that reveal relationships Ex: Bat is considered a mammal because it has hair and provides milk for their young and not a bird because of the wings

4 Classification of Organisms Kingdom Phylum / Division Class Order Family Genus Species

5 Genus/Species Binomial nomenclature: two word naming system where the first word identifies the genus (a similar group) and the second identifies the species (a characteristic) Ex: Scientific name of modern humans is Homo sapiens. Notice that the genus is capitalized and the species is lowercase

6 Brown Squirrel Kingdom: Animalia (animal) Phylum: Chordata (has a backbone) Class: Mammalia (has a backbone and nurses its young) Order: Rodentia (has a backbone, nurses its young, and has long, sharp front teeth) Family: Scuridae (has a backbone, nurses its young, has long, sharp front teeth, and has a bushy tail) Genus: Tamiasciurus (has a backbone, nurses its young, has long, sharp front teeth, has a bushy tail, and climbs trees) Species: hudsonicus (has a backbone, nurses its young, has long, sharp front teeth, has a bushy tail, and has brown fur on its back and white fur on its underparts)

7 Classification of two animals Bobcat Animalia Chordata Mammalia Carnivora Felidae Lynx rufus Lynx Animalia Chordata Mammalia Carnivora Felidae Lynx canadensis

8 Five Kingdom System Bacteria Protists Fungi Animals Plants

9 Bacteria Unicellular, microscopic Archaebacteria: thought to live in extreme environments (swamps, hydrothermal vents). Now found everywhere Eubacteria: all of the other bacteria (~10,000) Oldest fossil 3.5 billion years old No nucleus Prokaryotic Some have no chlorophyll Decomposers Parasitic

10 Protists Unicellular or multicellular; microscopic Nucleus present, but lacks complex organ systems Eukaryotic Autotrophic or heterotrophic Lives in moist environments Found in fossils up to 2 billion years ago Red, Green and brown algae are plant-like protists

11 Fungi Eukaryotic Either unicellular or multicellular No root, stem and leaf No chlorophyll decomposer or parasitic Reproduce by forming spores First appeared in the fossil record 400 million years ago ~100,000 known species

12 Animals Eukaryotic, multicellular Heterotrophs Oldest animal fossil 600 million years old Divided into two groups according to the presence or absence of backbone: Invertebrates : without backbone Vertebrates : with backbone

13 Invertebrates

14 Invertebrates

15 Invertebrates

16 Vertebrates Divided into 5 groups: Fish Amphibians Reptiles Birds Mammals

17 Fish Aquatic Cold-blooded Body covered with wet and slimy scales Streamlined body for easy movement through water Fins for balance and to control movement Gills for breathing External fertilization

18 Amphibians Cold-blooded Moist, scale-less skin Limbs present Larvae (tadpoles) use gills for breathing; adults use lungs External fertilization

19 Reptiles Cold-blooded Body covered with dry, hard scales Live on land Breathe with lungs Internal fertilization; lay shelled eggs

20 Birds Warm-blooded With feathers With wings Beak for feeding Lungs for breathing Internal fertilization; lay shelled eggs

21 Mammals Warm-blooded Hair on skin Females have mammary glands for producing milk for their offspring Lungs for breathing Internal fertilization; embryos develop inside mothers bodies

22 Plants Most plants contain photosynthetic pigments (e.g. chlorophyll) for photosynthesis Autotrophic Can be divided into two groups: Non-flowering plants Flowering plants Oldest fossil 400 million years old Roughly 500,000 known species

23 Non-flowering plants 4 groups: Algae Mosses Ferns Gymnosperms

24 Algae Aquatic Simple multicellular plants No root, stem or leaf Contain photosynthetic pigments (e.g. chlorophyll) for photosynthesis

25 Mosses With simple leaves and stems No roots Reproduce by spores Found in damp areas

26 Ferns With true roots, stems, leaves and vascular tissues Reproduce by spores Live in damp places

27 Gymnosperms Reproduction by producing seeds Seeds develop in cones, not enclosed by fruits naked seeds Needle-shaped leaves to reduce water loss

28 Angiosperms (Flowering plants) With flowers for reproduction Seeds are produced inside the fruit (matured ovary)

29 Dichotomous Key

30 Your Mission Biology book page 474 & 475 Make a dichotomous key using beetles Follow the procedure and answer questions 1-3