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प्रश्न
Give a brief account of discovery of the cell.
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उत्तर
Discovery of cell:
Cell was first discovered and named in 1665 by an English scientist Robert Hooke. He was examining a thin slice of cork and observed that the cork resembled the structure of honeycomb consisting of many little compartments. He called these compartments as cells (meaning 'little room' in Latin).
In 1838, Jakob Matthias Schleiden first proposed the idea that all plants consist of cells.
In 1839, Theodor Schwaan proposed that all animals and plants are made up of cells.
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संबंधित प्रश्न
Who discovered cells and how?
Name the part of the cell concerned with the following:
Hydrolytic in function
State whether the following statement is true (T) or False (F):
Genes are located on a chromosome.
Fill up the blank with the terms given below
All cells arise from ______ cells
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 |
Write a short answer.
Why is a cell called the structural unit of a living organism?
Name any five cell organelles.
Expand - ER
Fill in the blank with a suitable word:
Cell ______ was proposed by Schleiden and Schwann.
Sketch and describe in your own words, the animal cell
