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प्रश्न
Who proposed the Cell theory? Explain the main points of this theory.
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उत्तर
In 1839, M.J. Schleiden and T. Schwann proposed the cell theory. This was further expanded by Virchow in 1858.
The main features of the cell theory as known at present are:
(i) All living organisms are composed of cells. Hence cell is the structural unit of living organisms.
(ii) All cells arise from pre-existing cells of a similar kind by cell division.
(iii) The chemical composition and metabolism of all cells are basically alike.
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संबंधित प्रश्न
Where are chromosomes found in a cell? State their function.
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 |
What is the function of the following?
Mitochondria
Fill in the blank with a suitable word:
Cell ______ was proposed by Schleiden and Schwann.
the question has four options. Choose the correct answer:
Mitochondria were first seen by
Name the different organelles in a cell?
The instrument used to observe the cell is _____
I take part in food production of a cell. Who am I? ____
Nerve cell is the longest cell
