Gr7 U0&1 animal and plan Cells revision sheet.pptx

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1. Grade 7 Unit 1 revision sheet In any scientific experiment we should identify three variables. The independent variable is the variable that we change on purpose . (limited to only one in any experiment) The dependent variable is the variable that we measure . The control variables are the variables that we keep the same to ensure that the test is fair. The steps to use the microscope. Make sure to plug it in and switch on the light. T he object is placed on a rectangular glass slide. T he slide is placed on the stage Make sure to use the lowest power (shortest objective lens). Move the stage to the highest position. Look through the eyepiece and use the coarse knob until you see a proper image. Use the fine knob to focus the image in view.

2. PART DESCRIPTION PLANT CELL ANIMAL CELL Cell Membrane Controls what moves in and out of the cell ✔ ✔ Cell Wall Supports the cell, gives it strength ✔ Chloroplast The location of photosynthesis, it contains chlorophyll (green pigment) that catches the sunlight. ✔ Cytoplasm Gel like material that fills the whole cell. ✔ ✔ Mitochondria The powerhouse of the cell (energy provider). ✔ ✔ Nucleus Contains DNA (cell brain) ✔ ✔ Ribosome Protein machine for the cell ✔ ✔ Central Vacuole A space filled with cell sap (cell food) ✔ unicellular multicellular One cell only Many cells Microscopic Can be seen without a microscope That single cell does all the jobs. Specialized cells, each has its own function e.g. skin cells, muscle cells