Advertisements
Advertisements
प्रश्न
Who proposed the Cell theory? Explain the main points of this theory.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
A plant cell can be identified from an animal cell by the :
State whether the following statement is true (T) or False (F):
Genes are located on a chromosome.
Write true or false for each statement. Rewrite the false statements correctly:
The size of a cell is usually measured in centimetres
Write true or false for each statement. Rewrite the false statements correctly:
Growth and reproduction are based on cell division
Name any five cell organelles.
What was the contribution of the following to our knowledge of cells?
Schwann
What is the function of the following?
Ribosomes
What is a chromosome?
the question has four options. Choose the correct answer:
Mitochondria were first seen by
Matching:
| 1. | Discovery of cell | a. | Nerve cell |
| 2. | Unicellular organism | b. | spirogyra |
| 3. | Multicellular organism | c. | Robert Hooke |
| 4. | Longest cell | d. | Cyanobacteria |
| 5. | Prokaryotic cell | e. | Amoeba |
