How are cells formed? Their functions?
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Cells are the building blocks of life. When living things reproduce asexually, the cells that result are exact replicas of the parent cell. This can be accomplished by binary fission, budding, vegetative propagation or spore formation. The chromosomes in the nucleus are replicated and mitotic division occurs producing two daughter cells which have the same DNA as the parent cell. When organisms reproduce sexually, meiotic division occurs. This is a reduction division and it occurs in the gonads. The end result are haploid gametes or sex cells. Once these fuse at fertilization, a diploid zygote or fertilized egg results. From this cell, all other body cells will be produced by mitotic division. Cells can be highly specialized. For example, neurons transmit impulses, muscle cells enable movement and response to stimuli, epithelial cells are found in linings like the nasal passage, bone cells are for support, erythrocytes carry oxygen in the blood, phagocytes engulf germs. These are but a few examples of the plethora of cells found in the body.
science explains this,we can build computers ,weapons etc but formation of cell cannot be figured out
Cells are the building blocks of life. To make a new cell, you must have the process is called cellular division. There are two main forms: meiosis and mitosis. For meiosis, the cell creation is specifically for sex cells, or gametes.
For mitosis, the cells must go through the actual procedure of division. This process takes multiple stages. After the replication of a second pair of chromosomes, proteins, and organelles a cell begins to prepare for division. Basically, when the cell is splitting in half, each half will have exactly the same material as the other. Interphase, Prophase, Metaphase, Anaphase, and Telophase are the basic phases of mitosis.
A single cell divides and forms two cells. These again divide and the process continues, resulting in the developement of the body of the plant or animal. There are different methods by which new cells are formed in plants by division of the pre-existing cell. In all such cases it is the nucleus that divides first, and this is followed by the division of the cell. Plant and animal bodies are composed of cells which are its fundamental structural and functional units. Cell division leading to the developement of the vegetative body of the plant is known as somatic cell division. It includes the division of the nucleus, called mitosis, and the division of the cytoplasm, called cytokinesis.
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