PUMPA - SMART LEARNING
எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்
Book Free DemoAim: To observe the cell structures of an onion peel under a compound microscope.
Apparatus and Materials required:
1. Onion
2. Forceps
3. Class slide
4. Watch glass
5. Iodine solution
6. Coverslip
7. Mounting needle
8. Compound microscope
Theory:
All living things are made up of cells. Cells are the building blocks of life. The shape, size and number of cells vary across different organisms.
Cell has three significant components.
Cell has three significant components.
1. Cell membrane
2. Cytoplasm
3. Nucleus
2. Cytoplasm
3. Nucleus
In-Plant cell, a cell wall surrounds the cell membrane.
- Take a small piece of onion pulp, and peel it off from its concave side (inner layer).
- Then put it in a watch glass containing water (to prevent the peel from getting folded or getting dry).
- Take a class slide, put a drop of water on it and transfer the onion peel to the slide (make sure the peel is perfectly flat on the slide).
- Put a drop of iodine solution on this piece followed by a coverslip (avoid air bubbles while putting the coverslip with the help of mounting needle).
- Now observe under the compound microscope.
Observation:
Onion cell under a microscope
Important!
You can see large, rectangular interlocking cells and observe visible cell wall, nucleus, large vacuoles, and some granules.
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