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प्रश्न
Differences between light microscope and electron microscope.
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उत्तर
| Light microscope | Electron microscope |
| 1. It uses glass lenses | 1. It uses electromagnets. |
| 2. It uses a beam of light to illuminate the object. | 2. It uses a beam of electrons instead of light |
| 3. Internal vacuum is not required. | 3. Internal vacuum is essential. |
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संबंधित प्रश्न
Carry out the following osmosis experiment:
Take four peeled potato halves and scoop 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,
- Keep cup A empty
- Put one teaspoon of sugar in cup B
- Put one teaspoon salt in cup C
- Put one teaspoon sugar in the boiled potato cup D.
Keep these for two hours. Then, observe the four potato cups and answer the following:
- Explain why water gathers in the hollowed portion of B and C.
- Why is potato A necessary for this experiment?
- Explain why water does not gather in the hollowed-out portions of A and D.
Which part of the cell contains organelles?
Which type of cell division is required for growth and repair of body and which type is involved in formation of gametes?
Do you think the cells of an elephant would be larger than the cells of a rat? Explain briefly.
Match the name of the organelle given in Column A with its function given in Column B.
| Column A (Organelle) | Column B (Function) | ||
| 1 | leucoplast | a | help in cell division |
| 2 | nucleus | b | transport of material |
| 3 | ribosomes | c | making food |
| 4 | mitochondria | d | digesting foreign bodies |
| 5 | endoplasmic reticulum | e | storage of starch and proteins |
| 6 | golgi bodies | f | making the cell turgid |
| 7 | chloroplast | g | making proteins |
| 8 | centrosome | h | controlling all the vital activities of a cell |
| 9 | vacuole | i | releasing energy |
| 10 | lysosomes | j | synthesis of cell wall in a plant cell |
Write a short answer.
Where are the genes located in a cell?
Write a short answer.
What is the relationship between growth and cell division?
Why was the invention of the microscope so important to the study of living beings?
Make sketches of animal and plant cells which you observe under microscope.
