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Transcript
Notes for Unit A Characteristics of Living Things Chapter 1 Classifying Living Things p. A2-A11 What is the basic unit of life? (p. A6) -organism= any living thing -cell= smallest part of an organism; works to keep living thing alive -chlorophyll= green chemical inside plant cells that let plants make their own food using the sun’s energy Plant and animal cells (p. A6-A7) -ONLY plant cells have the following parts: chloroplasts =part that contains chlorophyll cell wall =rigid structure around the whole cell vacuole= stores food, water, waste -BOTH plant and animal cells have the following parts: Nucleus= control center of cell (brain) Cytoplasm= fluid inside cell where all the parts float Mitochondria= releases energy into cell Cell membrane= holds the cell together What are living things made of? (p. A8-A9) -single cell organisms include bacteria and some fungi -many-celled organisms work together doing different jobs to keep the organism alive, like algae, trees, animals (humans) -tissue= similar cells that have the same job working together (examples celery stalks in a plant or muscles in an animal) -organ= tissues of different kinds coming together (examples- heart, lungs, brain in animals) -organ system= group of organs that work together to do a certain job (examples- fox’s digestive system includes mouth, stomach, and intestines) What traits are used to classify organisms? (p. A10) -classification= science of finding patterns among living things -Aristotle first classified plants into 3 groups by size (herbs, shrubs, and trees) -today we classify organisms by looking at their cells, tissues, organs, and organ systems and trying to find out what is the same and different