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प्रश्न
Define the term cell? Also, describe types of cells.
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उत्तर
Cell is the smallest structural and functional unit of all living organisms and is a membrane bound structure enclosing the protoplasm.
The two types of cells are:
- Prokaryotic cells – These cells lack a well-organised nucleus and membrane bound organelles. They are usually found in unicellular organisms, which are referred to as prokaryotes. Examples of prokaryotes are bacteria and blue-green algae.
- Eukaryotic cells – These cells possess a well-organised nucleus and membrane bound organelles. Organisms made up of eukaryotic cells are called eukaryotes. Examples of eukaryotes are plants and animals.
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संबंधित प्रश्न
Write short notes on the following.
Nucleus of a cell
Where are chromosomes found in a cell? State their function.
Explain why chloroplasts are found only in plant cells?
What is the cell theory? Who propounded it and when?
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 |
Give one main function of the following:
Chloroplast
Fill in the blank with a suitable word:
______ controls all the metabolic activities of the cell.
Which is the longest human cell?
Write about the contribution of Robert Hooke in cell biology.
