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Transcript
Cell Functions Test Review 2014 Organelles • Nucleus: control center of a cell; contains DNA • Nuclear membrane: surrounds nucleus – determines what goes in/out of nucleus • • • • • Cytoplasm: jelly like substance that fills in the cell Cell Membrane: determines what goes in/out of cell Mitochondria: provides energy for the cell Vacuole: stores water, waste, and other materials for the cell Cell Wall: surrounds and protects plant cell; gives plant cell a rigid shape • Chloroplast: absorbs energy from the sun for photosynthesis Draw and Label the Animal and Plant Cells Photosynthesis • What is photosynthesis? • Process where plants make their own food • What is required for photosynthesis to occur? • Water carbon dioxide sun • What is created during photosynthesis? • Glucose oxygen • What is the formula for photosynthesis? • Carbon dioxide + water glucose + oxygen • What energy transformation occurs during photosynthesis? • Radiant energy chemical energy Photosynthesis Diagram sun oxygen Carbon dioxide water glucose Stimulus and Response • • • • Stimulus: something that causes a change Response: the reaction to the stimulus Internal: inside External: outside Stimulus and Response • • • • Tropism: growth response of a plant to a stimulus Geotropism: plant roots grow towards gravity Phototropism: plants grow to face the sun Turgor pressure: pressure created inside of plant cells by the amount of water in the vacuole • Wilted: little water – vacuole shrinks • Turgid: lots of water – vacuole is full Tropism • Geotropism • Phototropism Turgor Pressure • Turgid • Wilted How is turgor pressure an example of stimulus and response? • Stimulus: lack of water • Response: vacuoles shrink; plant wilts ----------------------------------------------------------------- • Stimulus: too much water • Response: vacuoles fill up and cells can burst