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प्रश्न
Living cells were discovered by
पर्याय
Robert Hooke
Purkinje
Leeuwenhoek
Robert Brown
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उत्तर
Leeuwenhoek
Explanation -
Cells were first discovered by Robert Hooke in 1665. He observed the cells in a cork slice (dead cells) with the help of a primitive microscope. Leeuwenhoek (1674), with the improved microscope, discovered the free-living cells in pond water for the first time. Robert Brown (in 1831) discovered the nucleus in the cell. Purkinje (in 1839) coined
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संबंधित प्रश्न
Shown below are four stages (A, B, C, D) (not in sequence) of a certain kind of cell division.
- Is it a plant cell or an animal cell? Give two reasons.
- Is it undergoing mitosis or meiosis?
- What should be the correct sequence of these four stages among themselves?
- Name the stage that should precede the earliest of these stages.
- Draw the stage names above inside the blank space provided.
Somatic and stem cells undergo ______ type of division.
Fill in the blank:
The energy for cell division is stored as ______.
What type of cell division does occur in somatic cells of the body?
Name the following:
The process by which cell divides into two equal daughter cells.
Name the following:
The type of cell division present in unicellular organisms.
Name the following:
The two kinds of cell division found in living organisms.
Genetic variations occur in meiosis because of ______.
A mature RBC lacks a nucleus.
Explain amitosis.
