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प्रश्न
Briefly discuss the importance of chromosomes to an organism
उत्तर
The most important feature of a living cell is that it can divide or reproduce of its own kind and this function is regulated by the nucleus of the cell. The nucleus in its nucleoplasm contain a network of dark stained thread like structures called chromatin fibres. These fibres during cell division become thick and ribbon like which are then called chromosomes. The chromosomes are the actual hereditary factors. These are unique for each species both in number and in character.
The human body has 46 chromosomes which occur in pairs. They are further categorised as:
- Chromosomes specific for determining the sex of the species called the sex chromosomes.
- Other chromosomes are called autosomes.
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संबंधित प्रश्न
If the organisation of a cell is destroyed due to some physical or chemical influence, what will happen?
Complete the crossword with the help of clues given below.
Across
1. This is necessary for photosynthesis.
3. Term for component present in the cytoplasm.
6. The living substance in the cell.
8. Units of inheritance present on the chromosomes.
Down
1. Green plastids.
2. Formed by collection of tissues.
4. It separates the contents of the cell from the surrounding medium.
5. Empty structure in the cytoplasm.
7. A group of cells.
Name the part of the cell concerned with the following :
Synthesis of proteins
Fill in the blanks :
Very thin flexible, a living membrane which is differentially permeable, is called__________.
What is the difference between an organ and an organelle?
Distinguish between the following pairs of science :
Cell wall and cell membrane
Fill up the blank with the terms given below
Plastids contain ______.
Write true or false for each statement. Rewrite the false statements correctly:
The nuclear membrane encloses a colourless, dense fluid called nucleoplasm
Identify the cellular structure with the help of the following clue:
It consists of cisternae, vesicles and vacuoles.
Identify the cellular structure with the help of the following clue:
It gives turgidity to the plant cells.
