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September 20, 2011 (D-day)

September 20, 2011 (D-day). Agenda: Bellwork Finish notes- characteristics of living things Classwork Go over quiz. Homework. Read pages 16-22 Answer questions 1 to 4 & “Connecting Concepts” Complete sentences on a separate sheet of paper. UNIT TEST (This Friday, 9/23)

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September 20, 2011 (D-day)

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  1. September 20, 2011 (D-day) Agenda: Bellwork Finish notes- characteristics of living things Classwork Go over quiz

  2. Homework Read pages 16-22 • Answer questions 1 to 4 & “Connecting Concepts” • Complete sentences on a separate sheet of paper. UNIT TEST (This Friday, 9/23) Unit 1: The Science of Biology (including lab safety/equipment)

  3. Chapter 1: Section 1-3Studying Life Biology: the study of life -the science that seeks to understand the natural world. Characteristics of Living Things What makes something “living”? Examples) Living: ___________________ Non-living: ________________

  4. Made up of Cells All living things, or organisms, are made up of tiny units called cells. • Cell: basic unit of structure & function. • -a collection of living matter with a barrier that separates it from its surroundings. • - cells can grow, respond to their surroundings, and reproduce.

  5. Unicellular: made of only one cell Examples) protozoa Multicellular: made of many cells Examples) a house plant

  6. 2. ReproduceAll organisms produce new organisms through reproduction. Two basic types 1. Sexual reproduction:2 cells from different parents join & produce first cell of new organism. 2. Asexual reproduction:the new organism comes from one parent (either by dividing in half or growing a new portion that splits off)

  7. 3. Based on a Genetic CodeAll living organisms inherit traits. DNA: the molecule that has the directions for inheritance. • Asexual reproduction offspring are identical to parents. • Sexual reproduction offspring are different (combined traits) but same type of organism. Example) flies produce flies, dandelions produce dandelions, etc.

  8. 4. Grow and DevelopLiving things may increase in size and develop. -Unicellular organism  grow • Growth: the process of becoming larger. • Development: the process of change in which an organism becomes more complex. • -Multicellular organisms grow and develop.

  9. 5. Need Materials and EnergyAn organism uses energy and materials to grow, develop, and reproduce. • Metabolism: the combination of all the chemical reactions that occur in an organism. • All organisms take in needed materials (nutrients, water, air) but obtain energy in different ways.

  10. Autotrophs: use energy to produce their own food. Example) Plants • Heterotrophs: must consume food to get energy. Example) humans, animals • Decomposers: get energy from eating organisms that have died. • Example) vultures, flies (maggots)

  11. 6. Respond to the EnvironmentAll living things have the ability to respond to stimuli in their environments. • Stimulus: a signal to which an organism responds (plural: stimuli). • Response: the reaction to a stimulus. Example) shivering on a cold day

  12. 7. Maintain Internal Balance • Homeostasis: regulation of an organism’s internal environment to maintain conditions suitable for its survival. Example) Humans maintain a constant body temperature. • Homeostasis involves feedback mechanisms.

  13. 8. Evolution Evolution: change in a kind of organism over a long period of time. • Important for survival because the world is always changing. • Groups of organisms must be able to adapt and evolve.

  14. Summary of the 8 Characteristics of Living Things

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