Answer the following questions in short -
1. Who discovered cell and when?
2. Who was the first person to observe living cells?
3. Name the longest cell of your body. Why is it so?
4. Who proposed Cell Theory? Write its main features.
5. Name the smallest and largest living cell.
6. What will happen if a cell is kept in hypertonic solution? Name the process involved.
Answers
Explanation:
The cell was first discovered by Robert Hooke in 1665 using a microscope. The first cell theory is credited to the work of Theodor Schwann and Matthias Jakob Schleiden in the 1830scell theory is the historic scientific theory, now universally accepted, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells. Cells are the basic unit of structure in all organisms and also the basic unit of reproduction.
The three tenets to the cell theory are as described below:
All living organisms are composed of one or more cells.
The cell is the basic unit of structure and organization in organisms.
Cells arise from pre-existing cells.
There is no universally accepted definition of life. Some biologists consider non-cellular entities such as viruses living organisms,[1] and thus reasonably disagree with the first tenet.
Answer:
Solutions
1.The cell was first discovered by Robert Hooke in 1665 using a microscope.
2.Robert Hooke in 1665.
3.The longest cell in human body is the neuron.
4.Cell theory was proposed by German scientists Theodor Schwann and Matthias Jack Schleiden in 1839.
Cell theory was proposed by German scientists Theodor Schwann and Matthias Jack Schleiden in 1839. The main points of this theory are:-
Cell theory was proposed by German scientists Theodor Schwann and Matthias Jack Schleiden in 1839. The main points of this theory are:-All living organisms are made up of a cell.
Cell theory was proposed by German scientists Theodor Schwann and Matthias Jack Schleiden in 1839. The main points of this theory are:-All living organisms are made up of a cell.The cell is the basic structural and functional unit of life.
Cell theory was proposed by German scientists Theodor Schwann and Matthias Jack Schleiden in 1839. The main points of this theory are:-All living organisms are made up of a cell.The cell is the basic structural and functional unit of life.All biochemical processes occur within the cell.
Cell theory was proposed by German scientists Theodor Schwann and Matthias Jack Schleiden in 1839. The main points of this theory are:-All living organisms are made up of a cell.The cell is the basic structural and functional unit of life.All biochemical processes occur within the cell.New cells are formed from pre-existing cells.
Cell theory was proposed by German scientists Theodor Schwann and Matthias Jack Schleiden in 1839. The main points of this theory are:-All living organisms are made up of a cell.The cell is the basic structural and functional unit of life.All biochemical processes occur within the cell.New cells are formed from pre-existing cells.Cells contain hereditary information which is transferred from generation to generation.
5.The smallest cell is Mycoplasma (PPLO-Pleuro pneumonia like organims). It is about 10 micrometer in size. The largest cells is an egg cell of ostrich. The longest cell is the nerve cell.
6.If you place an animal or a plant cell in a hypertonic solution, the cell shrinks, because it loses water ( water moves from a higher concentration inside the cell to a lower concentration outside ). ... A single animal cell ( like a red blood cell) placed in a hypotonic solution will fill up with water and then burst.
Explanation: