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Cell - Structure and Functions
Write short notes on the following :
Nucleus of a cell
Nucleus is spherical dense body found in the centre of the cell. Nuclear membrane separates the nucleus from cytoplasm. It acts as control centre of the activities of the cell. Nucleus contains thread-like structures called chromosomes. Nucleus membrane is porous and allows the movement of material between the nucleus and cytoplasm. It also contains the threadlike structure called chromosomes which are genetic material.
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State the difference between eukaryotes and prokaryotes.
Where are chromosomes found in a cell? State their function.
‘Cells are the basic structural units of living organism.’ Explain.
Explain why chloroplasts are found only in plant cells?
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. Unit 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.
Who discovered cell?
Name three important parts of cell.
In which cells, cell wall is present?
Give three examples of unicellular organisms.
Where are chromosomes present in a cell?
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