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Tissues
What is the difference between:
(1) Meristematic cells and permanent cells.
(2) Parenchyma and collenchyma.
(1) Difference between Meristematic cells and Permanent cells.
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Meristematic Cells |
Permanent Cells |
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1. They have dense cytoplasm and a large centrally placed nucleus. |
1. They have less amount of cytoplasm, large central vacuole, and normal nucleus. |
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2. These cells are capable of dividing new cells. |
2. They attain permanent shape and are not capable to produce new cells. |
(2) Difference between Parenchyma and Collenchyma.
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Parenchyma |
Collenchyma. |
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1. It is a living tissue. Its cells store may store waste products such as tanin, resins, crystals etc. |
1. It is livingtissue and provides tensile strength the organ in which they are present. |
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2. Parenchymatous cells may or may not have intercellular shape. Their walls do not have thickening at the corners. |
2. Collenchymatous cells, usually do not have intercellular spaces. They have thickening at the corners of cell walls due to deposition of cellulose and pectin. |
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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?
Do different organisms have different types of basic building units ? Briefly explain.
To what the shape and size of cells are related to?
What constitute the basic building block of the cell?
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