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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
Give a brief account of discovery of the cell.
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.
Name the scientist who invented the first microscope.
Define the term cell? Also, describe types of cells.
What is the function of the following?
Cell membrane
Where is energy stored in a cell?
the question has four options. Choose the correct answer:
The cell was discovered by
An electron microscope is necessary for the study of ______.
Make sketches of animal and plant cells which you observe under microscope.
