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Grade 8 Unit: Cells
Grade 8 Unit A: Cells
| Term | Definition |
|---|---|
| What is the M in MR. GREEN? | Movement - The ability for an organism to bend and sway or relocate. |
| What is the first R in MR. GREEN? | Reproduction - The ability to reproduce and pass on its traits. |
| What is the G in MR. GREEN? | Growth - The ability to increase in size through cell growth or cell division. |
| What is the second R in MR. GREEN? | Response - The ability to react to stimulus. |
| What is the first E in MR. GREEN? | Excretion - The ability to get rid of waste. |
| What is the second E in MR. GREEN? | Exchange of Gases - In animals, the ability to breathe in oxygen and breathe out carbon dioxide. In plants, the ability to breathe in carbon dioxide and release oxygen. |
| What is the N in MR. GREEN? | Nutrition - The ability to acquire and process food/nutrients. |
| What are the 3 points of Cell Theory? | -All living forms are made from one or more cells -Cells only arise from pre-existing cells -The cell is the smallest form of life |
| What is diffusion? | The process by which molecules intermingle as a result of their kinetic energy of random motion. |
| What is osmosis? | When two solutions are separated by a semi-permeable membrane that only the solvent can diffuse across. The solvent diffuses across the membrane from the less concentrated solution to the more concentrated solution. This process is called osmosis. |
| What are the Ocular (Eyepiece) lens? | These are the lens that you look through that are located at the top of the microscope. They are usually 10X or 15X power. |
| What is the Body Tube? | The task of the tube is to connect the objectives and ocular lenses. |
| What is the Arm? | The arm is what supports the tube and connects it to the base of the microscope. |
| What are the Objectives? | There are usually 3-5 of these lenses on a microscope, which range from 4X-100X in power. |
| What is the Stage? | The flat platform where the slides are placed for observation. |
| What are the Stage Clips? | Clips on the stage used to hold the slides in place. |
| What is the Diaphragm? | This is used to vary or control the intensity of the cone of light focused under the specimen being observed. |
| What is the Course Adjustment Knob? | This is used before the Fine Adjustment Knob. The Coarse knob is the bigger knob and is used for bringing the specimen/object into focus. |
| What is the Fine Adjustment Knob? | This, along with the Coarse Knob, is also used for focus. It increases the detail of the specimen/object. |
| What is the Light Source/Illuminator? | This is the Light source of the microscope. Older microscopes may use mirrors to reflect light, though newer microscopes now usually use low-voltage bulbs. |
| What is the Base? | Used for support or as a foundation for the microscope. Always at the bottom of the microscope. |
| What is the Revolving Nosepiece? | This is the part that can be rotated to easily switch between different lenses. It usually holds 3 or more objective lenses. |
| Advantages of a Compound/Light microscope? | -High magnification for such a basic microscope -Fairly affordable -Easy to use -Can look at live samples |
| Disadvantages of a Compound/Light microscope? | -Low resolution -Irregular maintenance can result in blurred lenses -Very limited -Objects that are too thick will not be easy to observe. |
| Advantages of a Stereo/Dissecting microscope? | -Color viewing -Can be used on live samples -Requires little or no preparation for the sample -Three-dimensional images |
| Disadvantages of a Stereo/Dissecting microscope? | -Low magnification -Images are not inverted, which is essential when manipulating the specimen with hand held objects -Poor resolution |
| Advantages of a Confocal/Digital microscope? | -Three-dimensional images -High quality, detailed images -Can send images to a computer screen |
| Disadvantages of a Confocal/Digital microscope? | -Can be expensive -Requires at least one power cable -Samples can be photo damaged |
| Advantages of a Transmission Electron microscope? | -Very high magnification -Can be used in a variety of fields -Images are high quality and very detailed |
| Disadvantages of a Transmission Electron microscope? | -Requires sample preparation -Very expensive -Images are black and white |
| Advantages of a Scanning Electron microscope? | -Three-dimensional images -Easy to operate with proper training -Works quickly |
| Disadvantages of a Scanning Electron microscope? | -Expensive -Needs to be housed in an area free of electric, magnetic or vibration interference -Preparation for samples is needed -Small risk of radiation exposure |
Created by:
Kikachu
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