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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
The cell organelle that helps in the respiration of the cell is :
Name the part of the cell concerned with the following :
Transmission of hereditary characters from parents to offspring
State whether the following statement is true (T) or False (F):
Genes are located on a chromosome.
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 |
Why was the invention of the microscope so important to the study of living beings?
What was the contribution of the following to our knowledge of cells?
Schwann
What is the function of the following?
Mitochondria
Who studied the cell first?
An electron microscope is necessary for the study of ______.
