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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.
Fill in the blank:
The energy for cell division is stored as ______.
Write a sentence of the following:
Secondary constriction
What is the direct cell division? Explain with an example.
Name any cell organelle which is non membranous.
Name the organelles which show the analogy written as under
Control room of the cell——
The disappearance of spindle fibers is seen in ______.
During meiosis in pachytene, stages the paired chromosomes are called ______.
Nuclear membrane disappears completely in the phase called ______ of karyokinesis.
Explain the following concept in short:
Acrocentric chromosome
