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Grade 8 Unit: Cells

Grade 8 Unit A: Cells

TermDefinition
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