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प्रश्न
What is the cell theory? Who propounded it and when?
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उत्तर
All animals and plants are composed of cells, which serve as the units of structure and function. This, in short, is called the Cell Theory,
Cell theory was propounded by Theodor Schwann and Matthias Schleiden in the year 1839 and was modified by Rudolf Virchow in 1858.
APPEARS IN
संबंधित प्रश्न
Carry out the following osmosis experiment:
Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water. Now,
- Keep cup A empty.
- Put one teaspoon of sugar in cup B.
- Put one teaspoon salt in cup C.
- Put one teaspoon sugar in the boiled potato cup D.
Keep these for two hours. Then, observe the four potato cups and answer the following:
- Explain why water gathers in the hollowed portion of B and C.
- Why is potato A necessary for this experiment?
- Explain why water does not gather in the hollowed-out portions of A and D.
Write down differences between organ and organelle.
Name the scientist who invented the first microscope.
Fill up the blank with the terms given below
All cells arise from ______ cells
Fill in the blanks:
Organisms which are made up of a single cell are called ______ organisms.
Define the term cell? Also, describe types of cells.
Expand - RER
Fill in the blank with a suitable word:
DNA is an abbreviated form of ______.
An electron microscope is necessary for the study of ______.
New cells are produced from the existing cells.
