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B
T. Schwann
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C
H.G Khorana
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D
M.J. Schleiden
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Solution
The correct option is A Leeuwenhoek In the beginning of the 19th century, two persons, M. schleiden (1838)
and T. Schwann (1839) established cell theory, and postulated that cell is the
basic unit of life. The important features of this cell theory are, all
organisms are composed of one or more cells. All cells arise from
pre-exiting cells. Hence, option B and D are incorrect.
H.G Khorana has contributed for research of genetic code. Therefore, option C is incorrect.
Antonie van Leewenhoek is known for his valuable contribution for improvement of the microscope and establishment of microbiology. He observed many things using his microscope like, bacteria, vacuole of the cell, spermatozoa, etc. He is called as father of microbiology. Therefore, option A is correct.