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Transcript
7th Grade Integrated Science Cells 3-1 Indicator a. Use appropriate instruments to observe, describe, and compare various types of cells Main Ideas/ILOS A microscope will reveal differences between cells. Students will be able to focus a light microscope. b. Observe and distinguish the cell wall, cell membrane, nucleus, chloroplast, and cytoplasm of cells. c. Differentiate between plant and animal cells based on cell wall and cell membrane. d. Model the cell processes of diffusion and osmosis and relate this motion to the motion of particles. e. Gather information to report on how the basic functions of organisms are carried out within cells Plant cells have a cell membrane and a cell wall. They have green chloroplasts. They are regular in shape, boxlike. Animals cells vary in shape because they do not have cell walls. The flexible cell membrane holds them together. They lack chloroplasts. Diffusion is the movement of atoms and molecules from an area of high concentration to one of low concentration. This occurs because all matter is composed of moving particles. Osmosis is the movement of water molecules through a membrane from an area of high concentration to low. Investigate how cells extract energy from food, remove waste, produce their own food.