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प्रश्न
Differences between light microscope and electron microscope.
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.
Give a brief account of discovery of the cell.
Who coined the term “cell” ?
What is the function of the following?
Cell membrane
Fill in the blank with a suitable word:
______ controls all the metabolic activities of the cell.
Match the items in column A with the appropriate items in column B:
| column A | column B |
| 1. Platform or workplace for the synthesis of proteins | a. Golgi complex |
| 2. A powerhouse of cells | b. Ribosomes |
| 3. Help in the formation of cell plate during cell division | c. Chloroplast |
| 4. Site for photosynthesis | d. Mitochondria |
| 5. Control tower of cell | e. Chromosomes |
| 6. A structure bearing genes | f. Nucleus |
I take part in food production of a cell. Who am I? ____
Who discovered the cell in 1665?
Matching:
| 1. | Discovery of cell | a. | Nerve cell |
| 2. | Unicellular organism | b. | spirogyra |
| 3. | Multicellular organism | c. | Robert Hooke |
| 4. | Longest cell | d. | Cyanobacteria |
| 5. | Prokaryotic cell | e. | Amoeba |
