ch20
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Strategies of Life
Chapter 20
Great Idea:Living things use many different strategies to deal with the problems of acquiring and using matter and energy
Chapter Outline
• The Organization of Living Things• What is Life?• Classifying Living Things• Survival: A New Look at the Life
Around You• Strategies of Fungi• Strategies of Plants• Strategies of Animals
The Organization of Living Things
Ways of Thinking about Living Things
• Levels – Biosphere – Ecosystem – Community– Population– Organism– Anatomy and physiology– Cellular– Molecular
• All levels complement each other
Study an Ant
What Is Life?
The Characteristics of Life
• High degree of order and complexity• Part of larger systems of matter and energy• Life depends on chemical reactions in cells• Life requires liquid water• Organisms grow and develop• Regulate energy use• Share same genetic code, code is heritable• All living things are descended from a
common ancestor
Organisms Need Energy
Organisms Grow and Develop
Science in the Making
• Measuring plant growth
• Jan Baptiste Van Helmont
• Plant tissue and CO2
Classifying Living Things
Cataloging Life
• Linnaean classification– Shared characteristics
• Hierarchy– Kingdom– Phylum– Class– Order– Family– Genus– Species
• Binomial nomenclature
Classification of Life
Classifying Life - cont.
• Kingdoms– Monera– Protista– Fungi– Plants– Animals
Five-Kingdom Classification
Monera
Protista
Different Division of Life
• Carl Woese– Molecular genetics– Three domains
• Bacteria• Archaea• Eucaryea
Science by the Numbers
• How many species are there?
Species Estimation
Classifying Human Beings
• Kingdom: Animals• Phylum: Chordates
– Subphylum: vertebrates
• Class: Mammals• Order: Primates• Family: Hominid• Genus: Homo• Species: sapiens
Primates
Implications of Linnaean Classification
• Use of DNA• Similarity depends on time and
change• Classification results from real events
Survival: A New Look at the Life Around You
Survival: A New Look at the Life around You
• Autotrophs• Heterotrophs• Dealing with complexity• Two basic tasks
– Obtain and distribute molecules for energy
– Reproduce
Strategies of Fungi
Strategies of Fungi
• Growth– Filaments– Decomposers
• Structure– Mass of filaments
• Reproduction– Break filaments– Asexual reproduction
• Spores
Fungi
Fungi – cont.
• Lichens– Two interdependent species
Science in the Making
• The discovery of penicillin– 1928– Alexander Fleming
Strategies of Plants
The Simplest Plants
• Phylum: Bryophytes• Structure
– No roots– Photosynthetic
• Reproduction– Sexual – Asexual
Bryophytes
Vascular Plants
• Phylum: vascular plants• Structure
– Roots, stems, leaves– Control water loss
• Reproduction– Seedless– Gymnosperms– Angiosperms
• Sexual and asexual
Design of Vascular Plants
Angiosperm
Strategies of Animals
Major Animal Phyla
Invertebrates
• Invertebrates– No backbone– Most diverse animals
• Arthropods– 70% of known animal species
• Structure– Exoskeleton
Arthropods
Three Main Body Segments in Insects
Vertebrates
• Organization– Ocean to terrestrial
• Evolution– Earliest fish– Bony Fish– Amphibians– Reptiles– Birds– Mammals
Modern Fish
Mammalian Family Tree
Thinking More aboutLife’s Strategies
• Eating through the phyla