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प्रश्न
What is osmosis?
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उत्तर
- The movement of water molecules from a region of high concentration to a region of low concentration through a selectively permeable membrane is called osmosis. It is a special case of diffusion, where the medium is water.
- For example, if the medium surrounding the cell has a higher water concentration than the cell i.e., if the solution is a dilute solution, then the cell will gain water by osmosis.
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संबंधित प्रश्न
Write short notes on the following.
Nucleus of a cell
Explain why chloroplasts are found only in plant cells?
A plant cell can be identified from an animal cell by the :
What is the name of the chemical substance which constitutes the genes?
Do you think the cells of an elephant would be larger than the cells of a rat? Explain briefly.
Try to find the names of four cell organells hidden in this maze, (hint: The hidden words can appear horizontally or vertically; forwards or backward or even mixed up). Write them in the lines provided. For example : “NUCLEUS” in the last row, seven backward letters.
| A | J | F | B | H | E | M | O | E | L | O | U | C | A | V |
| H | V | L | E | U | C | O | P | L | A | S | T | N | O | E |
| C | H | R | O | M | O | P | L | A | S | T | X | T | E | R |
| S | U | E | L | C | U | N | W | P | L | A | S | T | I | D |
Fill in the blanks:
Organisms which are made up of a single cell are called ______ organisms.
What is cell theory? Name the three scientists whose work led to the formulation of the cell theory.
Which is the longest human cell?
When will you use a simple microscope and when, a compound microscope? Explain in detail how you will use them.
