Contained within the cytoplasm are not only the nucleus but also organelles, whose specific functions help the cell perform a range of activities.
While plant and animal cells are similar, the plant cell has, in addition to the cell membrane, another boundary that separates it from its external environment. This is called the cell wall.
As most plant cells carry out photosynthesis - the synthesis of organic substances - they contain chloroplasts.
In plant cells, vacuoles also tend to be larger in size and smaller in number than those found in animal cells.
Onion Skin Cell
Cheek Squamous Epithelial Cells
Typical Plant Cell
Typical Animal Cell
In the laboratory, you have learned how to prepare a microscope slide of human cheek cells as well as the epidermal cells of onions.
a) The differences you can observe between the two types of cells in term of the following:
Shape
Onion cells have a regular shape while cheek cells have an irregular shape.
Presence or absence of cell wall
Onion cells have a cell wall while cheek cells do not.
Presence or absence of vacuoles
Onion cells have a large vacuole while vacuoles in cheek cells, if present, are small.
b) Can you observe chloroplasts in the epidermal cells of onions? Explain your answer.
No chloroplasts can be observed in the epidermal cells of onions because epidermal cells do not carry out photosynthesis.
Within a small cell, there are so many, unseen with naked eyes, other organelles. This is a real proof of Allah's undeniable and unthinkable and also His very high level of creativity. But many people choose to lie and cheat themselves by not believing in Him. What a very regretful action by those who say they believe but actually they are liars. Can a man makea tiny tube like strand of hair and make fluid flow in it? Think of how great Allah is. Allahu Akbar (3x). Expose more to our kids, may Allah bless you, Insya Allah.(CikguMan3488)
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