General Studies -Biology -Cell
1- The structural and functional unit of the living body is called Cell. All living organisms are made of cells.
2-The history of cell science begins with the description of a thin section of a cork by Robert Hooke.
3-Cells were first observed by Robert Hooke in 1665.
4-Antonie Van Leeuwenhoek was the first to see lining bodies under microscope which he had constructed himself described the existence of unicellular organisms.
5-The cell is the fundamental unit of single cellular and multicellular organisma.
6-Cell exhibits a variety of shapes,sizes and number.
7-The cell has three main parts-cell membrane, cytoplasm and nucleus.
8-Robert Brown discovered nucleus in orchid leaf.
9-Single celled animals are called unicellular organisms.
10-Cell wall gives strength and rigidity to plants.
11-Plant cells differ from those of animals in having an additional layer around the cell membrane termed cell wall.
12-Cell wall is the layer present over the cell membrane.
13-The boundary of a cell is called cell membrane.
14-The jelly like substance between the nucleus and the cell membrane is called cytoplasm.
15-Nucleus is a prominent spherical body present in the cells ,controlling centre of all the activities in the cell.
16-Organelles are tiny structure present in the cytoplasm of cells,perform important life functions.
17-Group of tissues are called organs.
18-Pseudopodia is a locomotory organ in Amoeba.
19-Colouring the sample is called staining.
20-Magnify the size of an organism or cell or tissue is called magnification.
21-Concentrating o9n particular material is called focussing.
22- Organisation of cell
Cell
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Tissue
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Organ
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Organ System
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Organism
23-Examples of unicellular organisms are Amoeba,Bacteria, Chlamydomonas.
24- Most of the plants and animals are multicellular organisms.
25- The largest cell is the egg of Ostrich.
25-Compound microscope was made in the year 1595.
26-In leaves exchange of gases takes place through stomata.
Plant Cell Structure
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