Onion peel cell activity
Answers
Answer:
The epidermal peel of onion comprises of rectangular shaped cells. Each cell comprises of a nucleus, a central vacuole, thin layer of cytoplasm and cell wall.
As cell walls and large prominent vacuole are present in each cell, the cells placed under observation are plant cells.
Answer:
PROCEDURE
Take a piece of onion and bend it to remove the transparent membranous structure called onion epidermal peel. With help of forcep remove the peel from its inner side.
Place the peel in water in a watch glass.
Add a few drops of stain safranin, to the watch glass containing the peel for staining.
Now, wash the leaf peel with water and transfer it on to a clean slide with the help of brush.
Remove extra water from the slide surrounding the peel with the help of blotting paper.
To this slide, add a drop of glycerine over the peel and place the coverslip in a manner to avoid entry of air bubbles.
Soak away the extra glycerine with blotting paper.
Examine slide under the microscope.
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Explanation:
OBSERVATIONS
A large number of rectangular cells with distinct cell wall can be observed.
Cytoplasm is seen as thin layer of deep coloured substance on inner surface of cell wall.
A big central vacuole is present in the cell.
A deeply stained round body called nucleus is seen in each cell.
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RESULT
The epidermal peel of onion comprises of rectangular shaped cells. Each cell comprises of a nucleus, a central vacuole, thin layer of cytoplasm and cell wall.
As cell walls and large prominent vacuole are present in each cell, the cells placed under observation are plant cells