Biology : 1. Science and its limitations

Biology SummaryB.2. CELLULAR ORGANISATION AND FUNCTIONAppreciate that all living organisms are made up of cells.Cells are the building blocks of all leaving organisms, they carry out special functions for life. There are two types of cells, plant and animal cells.Know the structure of a typical animal cell and a typical plant cell (cell membrane, cytoplasm, nucleus, cell wall, vacuole, chloroplast only). Understand the functions of the parts of animal and plant cells (as listed above).Cell membrane it is a semi permeable membrane that allows substances to diffuse in and out of the cell. Nucleus it is like the brain of the cell, it controls all the activity of the cell and it contains DNA Cell wall it is made of celulouse, it protects the cell, it gives a definite shape and doesnt allow it to burst if the internal pressure of the cytoplasm increases. Vacuole it is used for water storageChloroplast it contains chlorophyll which absorb sunlight for photosynthesis Understand the significance of the difference in structure between animal and plant cells.Plant cells contains a cell wall and animal cells dont this is because plants need the cell wall for protection and to keep a definite shape specially for plant support. Plant cells contain chloroplast and animal cells dont this is because plant cells carry out photosynthesis Plant cells have a large central vacuole for water storage Appreciate that different types of cell ...


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