The vegetal world

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Cells: The units of life When studying plants under the microscope, scientists noticed that not only the bark of cork oak trees was formed by cells. All living beings , vegetals and animals, are formed by one or many grouped cells. Each cell is a life unit. It's the smallest part of a living being that has its own life, that is to say, cells are born, get fed, grow, reproduce themselves and die. The size of cells generally varies in a range between five and 50 microns, which means that in one millimeter there may be from 20 to 200 cells, based on the size. Some cells do live for few minutes, continually being renewed, while others live as long as the living being of which they are part. Cell constitution: Each and every cell is formed by: A NUCLEUS, which keeps the genetic information it has inherited, and in which all its features are printed under the guise of Chromosome and Genes. These will be transferred to the next generation of cells. CYTOPLASM, of viscous consistency, similar to egg white, where all biochemical processes take place. A CYTOPLASMIC MEMBRANE, which completely surrounds the cell and filters in a selective way all those substances which may penetrate the interior.

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