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Tissues
What are the five main functions of simple epithelial tissues?
The main functions of simple epithelial tissues are:
(i) The cells form the outer layer of skin. They protect the underlying cells from drying, injury, infection and chemical effects.
(ii) They regulate the exchange of materials between the body and the external environment.
(iii) They help in absorption of water and other nutrients, especially in alimentary canal.
(iv) They help in the elimination of waste products.
(v) Some of them are greatly specialized (glandular cells) and perform secretory function.
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Make a comparison and write down ways in which plant cells are different from animal cells?
How is a prokaryotic cell different from a eukaryotic cell?
What would happen if the plasma membrane ruptures or breaks down?
What would happen to the life of a cell if there was no Golgi apparatus?
Which organelle is known as the powerhouse of the cell? Why?
Where do the lipids and proteins constituting the cell membrane get synthesized?
How does an Amoeba obtain its food?
What is osmosis?
Carry out the following osmosis experiment:
Take four peeled potato halves and hollow each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water. Now,
(a) keep cup A empty
(b) put one teaspoon sugar in cup B
(c) put one teaspoon salt in cup C
(d) put one teaspoon sugar in boiled potato cup D.
Keep this setup for two hours. Then observe the four potato cups and answer the following :
(i) Explain why water gathers in the hollowed portion of B and C?
(ii) Why is potato A necessary for this experiment?
(iii) Explain why water does not gather in the hollowed out portions of A and D.
By which instrument you can see internal structure of onion peel cell?
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