Cells
6th Grade Science · 5 lessons
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Lessons
- 1The Basic Units of LifeCells are the basic units of life. All living things are made of one or more cells. Plant cells have cell walls and chloroplasts that animal cells lack.Experiment
- 2Mitosis: Cell DivisionMitosis is cell division that produces two identical daughter cells. It is how organisms grow, repair damaged tissue, and replace old cells.Experiment
- 3Why Cells Are SmallA cell must move materials in and waste out across its surface. As a cell grows, its volume rises faster than its surface area, so the surface eventually cannot serve the inside. That limit is why organisms grow by making more cells rather than bigger ones.Experiment
- 4Plant Cells Versus Animal CellsBoth have a nucleus, cytoplasm, cell membrane and mitochondria. Plant cells add three things animal cells lack: a rigid cellulose wall, a large central vacuole, and chloroplasts for photosynthesis.Experiment
- 5Specialised CellsCells change shape to do a job. A red blood cell loses its nucleus to carry more haemoglobin, a root hair cell grows a long projection to increase absorbing surface, and a nerve cell stretches to carry signals over distance.Experiment
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