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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.
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संबंधित प्रश्न
Try to find the names of four cell organells hidden in this maze, (hint: The hidden words can appear horizontally or vertically; forwards or backward or even mixed up). Write them in the lines provided. For example : “NUCLEUS” in the last row, seven backward letters.
| A | J | F | B | H | E | M | O | E | L | O | U | C | A | V |
| H | V | L | E | U | C | O | P | L | A | S | T | N | O | E |
| C | H | R | O | M | O | P | L | A | S | T | X | T | E | R |
| S | U | E | L | C | U | N | W | P | L | A | S | T | I | D |
Write true or false for each statement. Rewrite the false statements correctly:
Growth and reproduction are based on cell division
Write a short answer.
Why is a cell called the structural unit of a living organism?
Describe the structure of the chromosome in brief.
Fill in the blank with a suitable word:
The single-celled alga ______ measures 10 cm in length.
Fill in the blank with a suitable word:
Cell ______ was proposed by Schleiden and Schwann.
Which is the smallest cell?
Answer the following question.
Who discovered cells, and how?
I take part in food production of a cell. Who am I? ____
Nerve cell is the longest cell
