Class 9 Exam > Class 9 Notes > Lab Manuals for Class 9 > Viva Voce: Slide of Onion Peel and Cheek Cells
Viva Voce: Slide of Onion Peel and Cheek Cells | Lab Manuals for Class 9 PDF Download
Q.1. Why do we use stain for mounting the slide?
The stain makes cell wall, nucleus, cell membrane visible as they take up the stain.
Q.2. Name the type of microscope used to observe the slide of animal/plant cell.
One should use compound microscope with lens having the magnification of 10X, 40X and 100X.
Q.3. Give the use of glycerine in slide preparation.
Glycerine prevents drying of specimen. The material remains wet and do not dry.
Q.4. Why can’t we see all the cell-organelles under microscope?
The other cell organelles do not take up the stain and are too small to be seen under the lab microscope.
Q.5. Give one example of epithelial cell.
Cheek cell
Q.6. How many types of lenses are present in a compound microscope?
It consists of two lenses—objective lens and eyepiece.
Q.7. What is the function of cover slip in slide mounting?
A cover slip keeps the slide mounted material at a fixed position, the covering prevents the material from drying and also protects the lens of the microscope from getting in contact with the material which can lead to fungul growth on the lens.
Q.8. What should be the lens magnification when you place the slide under microscope?
Initially the lens with lower power i.e., 10X should be used to see the material and for viewing under higher power use higher magnified lens.
Q.9. What is the position/location of nucleus in animal cell and plant cell?
In plant cell nucleus is present on one side of the cell whereas in animal cell the nucleus is present in the middle of the cell.
Q.10. Why is nucleus present on one side of the plant cell?
The plant cell consists of big vacuoles which occupies the maximum space in the cell hence nucleus is present on the side.
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FAQs on Viva Voce: Slide of Onion Peel and Cheek Cells - Lab Manuals for Class 9
| 1. What is the purpose of observing onion peel and cheek cells under a microscope? |  |
Ans. The purpose of observing onion peel and cheek cells under a microscope is to study the structure and characteristics of plant and animal cells. This helps in understanding the differences between plant and animal cells, their functions, and their adaptations to their respective environments.
| 2. How can onion peel and cheek cells be obtained for microscopic observation? | |
Ans. Onion peel cells can be obtained by peeling off a thin layer from the inner surface of an onion bulb. Cheek cells can be obtained by gently scraping the inside of the cheek using a cotton swab or a toothpick. Both the samples can then be placed on a microscope slide and covered with a coverslip for observation.
| 3. What are the main differences between onion peel and cheek cells? | |
Ans. Onion peel cells are plant cells and have a distinct rectangular shape with a cell wall and a large central vacuole. Cheek cells, on the other hand, are animal cells and have a round or irregular shape with no cell wall and smaller vacuoles, if any. Additionally, onion peel cells contain chloroplasts for photosynthesis, while cheek cells do not.
| 4. What are the similarities between onion peel and cheek cells? | |
Ans. Both onion peel and cheek cells are eukaryotic cells, meaning they have a true nucleus and membrane-bound organelles. They also both contain a cytoplasm, cell membrane, and genetic material in the form of DNA. Furthermore, both types of cells perform essential functions necessary for the survival of the organism they belong to.
| 5. How can the observations of onion peel and cheek cells be useful in understanding human health? | |
Ans. Observing cheek cells can provide insights into the general health of an individual. Changes in the size, shape, or arrangement of cheek cells may indicate certain health conditions or diseases. Additionally, studying both onion peel and cheek cells can enhance our understanding of cell biology, which forms the basis for understanding various diseases and developing potential treatments.
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