Question

3. Who discovered nucleus in the cell?
4. Cells arise from the pre-existing cells’ this concept was given by which scientist?
5. Name the cell present in the body which is of greatest length.
6. To which of the substance does Robert Hooke sees the resemblance of slice of the cork
from a tree.

Answer 1

Answer:

3. Robert Brown discovered nucleus in the cell.

4. Rudolf Virchow gave this concept .

5. neurons is present in the body whixh is of greatest length.

6. While examining a slice of cork under a microscope Robert Hooke found that that there were honeycombs like structure ,he called those honeycomb like structures as cells . cell is a Latin word which means a little home. Robert Hooke resembled the cork piece as honey comb like structures.

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Answer 2

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1. Who discovered nucleus in the cell?

Ans- The Nucleus was discovered by Robert Brown in 1831. The Nuclear is the chief controller/Director/Principal of the cell. It is a double membranous body which controls the cell metabolic processes and also contains the genetic information of a body. The membrane of the Nucleus is also known as Nuclear Membrane/Karyotheca. The protoplasm of Nucleus is also known as nucleoplasm. A RNA synthesizing body Nucleolus is also present. The genetic information is found in Chromosomes.

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2. Cells arise from the pre-existing cells’ this concept was given by which scientist?

Ans- The above statement was proposed by Rudolf Virchow. It was actually, "E cellula Omni Cellula" wich means that the new cells grow or born from the pre existing cells only. He extended the Cell theory by adding this concept. The Cell theory was proposed by Schwannn and Schleiden which states that all living organisms are made up of cells.

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3. Name the cell present in the body which is of greatest length.

Ans- In the Human body, the Nerve cell or Neurons are the longest cell which can even reach upto 1 m. They are the fundamental units of the Nervous system. These cell if once destroyed, can't be repaired again. The largest nerve cells are found in our limbs.

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4. To which of the substance does Robert Hooke sees the resemblance of slice of the cork from a tree.

Ans- Robert Hooke in 1665, discovered small rooms which were the dead cells in the cork cells(from the bark of the tree). They resemble honeycomb like structure. He observed with his primmitive self-made microscope and wrote his observations in his book "Micrographia".

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