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प्रश्न
State the difference between eukaryotes and prokaryotes
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उत्तर
| Prokaryotes | Eukaryotes |
| Most prokaryotes are unicellular | Most eukaryotes are multicellular |
| The nucleus is poorly defined due to the absence of a nuclear membrane | The nucleus is well defined and is surrounded by a nuclear membrane |
| Nucleolus is absent | Nucleolus is present |
| Cell organelles such as plastids, mitochondria, golgi bodies, etc. are absent | Cell organelles such as plastids, mitochondria, golgi bodies, etc. are present |
| Bacteria and blue-green algae are prokaryotic cells | Fungi, plant, and animal cells are eukaryotic cells |
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.
The cell organelle that helps in the respiration of the cell is :
Name the part of the cell concerned with the following:
Hydrolytic in function
Name the part of the cell concerned with the following :
The entry of only certain substances into and out of the cell.
What is the name of the chemical substance which constitutes the genes?
Name the scientist who invented the first microscope.
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 |
Where are the genes located in a cell?
Fill in the blank with a suitable word:
______ controls all the metabolic activities of the cell.
New cells are produced from the existing cells.
