Important questions and answers of cells class 9th
What is cell? Ans-It is the basic structural and functional unit of life. ➡️Its shape is like a honeycomb. ➡️It is hexagonal structure. ➡️It is discovered by Robert Hooke in 1665. ➡️Firstly Robert Hooke saw in a thin slice of cork*. ➡️Cells means in latin "little room." Note:- *Cork - Cork is a substance which is obtained from the bark(वृक्ष की छाल) of a tree. Cell Theory ➡️Cell comes from the latin word 'Cellula' which means "a little room". ➡️It is discovered by English scientist, Robert Hooke (1635- 1703). ➡️His book 'Micropraphia' was published in 1665. ➡️In 1674, Anton von Leeuwenboke(1632 - 1723) is discovered free living cells in pond water for the first time in 1674. ➡️He also discovered sperm and identified the sperm cells of humans, dogs, rabbits, frogs, fish and insects. ➡️Nucleus (in plant) is discovered by Robert Brown (1787- 1889) in 1831. ➡️He is a Scottish botanist. ➡️The term Protoplasm* is given by J. E Purkinje(1787 - 1869) i...