Biology - Microscopy Practical

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question		réponse
Why is iodine solution added to onion cells? commencer à apprendre		To stain the cells so they are easier to see.
Why is coverslip lowered at an angle? commencer à apprendre		To prevent air bubbles from forming.
Which objective lens should you start with? commencer à apprendre		The lowest power objective (usually 4x)
Which focusing knob should be used first? commencer à apprendre		The coarse adjustment knob.
Which focusing knob is used for clear focus? commencer à apprendre		The fine adjustment knob.
What should you do after finding cells under low power? commencer à apprendre		Switch to a higher power lens and refocus using the fine adjustment knob.
How is total magnification calculated? commencer à apprendre		Total magnification=eyepiece lens x objective lens
What should the biological drawings include? commencer à apprendre		Labels and magnification.
What is the formula for calculating actual size? commencer à apprendre		Actual size=image size/magnification
How many micrometres are in 1mm? commencer à apprendre		1000 micrometres
Put the osmosis practical steps in order: Record final mass, Place in solutions, Cut potato cylinders, Blot dry, Record initial mass commencer à apprendre		1. Cut potato cylinders 2. Record initial mass 3. Place in solutions 4. Blot dry 5. Record final mass
Put these microscope steps in order: Use fine focus, Place slide on stage, Choose low power lens, Use coarse focus, Switch to higher power commencer à apprendre		1. Place slide on stage 2. Choose low power lens 3. Use coarse focus 4. Use fine focus 5. Switch to higher power

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