1.      Prepare a wet mount slide of a potato. Use a razor blade to slice a piece of tissue, as thin as possible, from a potato. Be careful not to cut your fingers. Prepare a wet‑mount slide; use a drop of water.

 

2.    Study the slide at low power (10X objective) and then at high power (40X objective). Add a drop of Lugol's solution (I₂KI) to the side of the coverslip and observe the cells as the iodine solution makes contact with them.

 

Make a sketch of the stained structures!

 

Specimen: ________________________

Magnification: ______________________

Shape and Description: ________________
_______________________________

 

The small oval‑shaped blue‑black structures are leucoplasts. Why did they turn blue?

How does the reaction of iodine with the potato cells compare with what you observed in your onion epidermis preparation?

What does this tell you about the differences between the storage products in onions and potatoes?

Do you see any chloroplasts? Why or why not?

 

 

 

3. Prepare a wet mount slide of carrot or red pepper. Use a razor blade to slice a piece of tissue, as thin as possible, from the outer portion of a peeled carrot, or scrape some tissue from a red pepper. Prepare a wet‑mount slide using water.

 

Can you see the chromoplasts? Sketch them.

 

Specimen: ________________________

Magnification: ______________________

Shape and Description: ________________
_______________________________

 

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