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प्रश्न
Write short notes on the following.
Nucleus of a cell
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उत्तर
Nucleus of a cell: The nucleus is a spherical structure generally present at the centre of a cell. The nucleus is composed of the following components:
1) Nuclear membrane: It is a double-layered membrane which separates the contents of the nucleus from the cytoplasm. The nuclear membrane has nuclear pores that allow the transfer of specific substances in and out of the nucleus.
2) Nucleolus: It is a small spherical body that is not bound by any membrane.
3) Chromosomes: These are thread-like structures that carry genes. Genes contain information necessary for the transfer of characteristics from the parents to the offspring. Thus, chromosomes play an important role in the inheritance of characteristics.
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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 type of cell division is required for growth and repair of body and which type is involved in formation of gametes?
Which one of the following is found both in the cells of a mango plant and a monkey?
A plant cell can be identified from an animal cell by the :
Fill up the blank with the terms given below
All cells arise from ______ cells
What is the function of the following?
Mitochondria
What is a 'cell'?
Sketch and describe in your own words, the animal cell
The instrument used to observe the cell is _____
The Term “ cell” was coined by ______
