aim: what do the organelles of plant cells look like under a microscope? dn: how do we find the...

AIM: What do the organelles of plant cells look like under a microscope?

DN: How do we find the magnification of a microscope? Find the magnification of low power (yellow) and high power (blue) under the microscope in front of you.

HW: Castle Learning- cellsCells Exam- Tuesday–Cellular organization, cell theory, life

functions, cell organelles, microscope

Total Magnification

Ocular Lens X Objective lens= total magnification

Low Power (yellow): 10 X 10 = 100X

High Power (blue): 10 X 40 = 400X

Pre-Lab Questions

1. What is an organelle?

Structure inside a cell that carries out a specific function.

2. What is the difference between a plant cell and an animal cell?

Plant cell: chloroplast and cell wallAnimal Cell: centrioles

3. What is the function of the following organelles?

• Cell Wall: Protection and Support• Cell membrane: determines what can enter

and leave the cell• Vacuole: storage of water/nutrients/waste• Chloroplast: photosynthesis• Cytoplasm: where all cellular activity takes

place• Nucleus: controls all cellular activity

Elodea

Elodea: Invasive Species in NYS

Naja

How to make a wet mount slide

1. Prepare a wet mount slide2. Focus under scanning on microscope (red)3. Switch to low power (yellow)

1. Can turn coarse and fine adjustment to focus2. Draw one row of cells across the middle- be sure to

count how many cells fit across!!

4. Switch to high power- don’t move coarse adjustment before switching!!

1. Can only turn fine adjustment2. Draw one row of cells across the middle3. Label the chloroplasts and cell wall

Elodea: yellow- low power 100X

Elodea: blue- high power 400X

Cell Measurement• 1mm = 1000um• FOV= 2mm

2mm = _______________ um• Divide FOV (um) by # of cells that fit across

To convert:• mm um: multiply by 1000 (move decimal 3

places to right)• Um mm: divide by 1000 (move decimal 3 places

to the left)