Discussion on The multicellular organisms

The multicellular organisms consist of many cells. Multicellular organisms have not existed from the beginning. The multicellular organisms appeared on the Earth around 600 million years back. The unicellular organisms mostly reproduce asexually, but sexual reproduction preferably occurs in multicellular organisms. Humans are examples of multicellular organisms that reproduce by the fusion of a sperm and an egg. This fusion leads to zygote formation. The zygote undergoes mitotic division to form the many cells. During development, processes like cell proliferation, cell division, and cell differentiation occur. Hence in a multicellular organism all the organs, tissues, and various specialized cells originate from the zygote. Different biological responsibilities are delegated to the various specific organs in the multicellular organisms. The organs are made up of different cells and all the cell types work together so that the specific tasks can be performed. Multicellular organisms have several important characteristics. The multicellular organisms comprise many cells and hence they are complex organisms. They have differentiated cells that help in the formation of different organs or tissues and carry out various functions that help the organism to survive. In contrast to the unicellular organisms, the multicellular organisms are big and hence can be viewed with the naked eye. The multicellular organism enlarges in size because the cells divide and increase in number. Multicellular organisms are eukaryotes. This means their cells comprise of membrane-bound structures. The cell-cell interaction process is very important in multicellular organisms because it is accountable for the various physiological processes that occur. Because of this, there is a coordinated functioning in the organism.

The multicellular eukaryotic organisms that belong to the kingdom Animalia are known as animals. Animals differ greatly from other multicellular organisms like fungi and plants. A characteristic feature observed in animals is mobility. Animals move from one spot to another spot to search for food or for other purposes. The eukaryotic cells in animals do not possess a cell wall. Environmental stimuli like sound, touch, and light can be detected by the animals. The sensory nerve cells in animals detect the stimuli and the information gets processed by the animal’s nervous system. Animals obtain food by consuming other living organisms and are hence known as heterotrophs. Mostly all the animals digest their food internally with the help of the various specialized organs and tissues. Most of the animals reproduce by the process of sexual reproduction.

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The multicellular organisms that belong to the kingdom Plantae are known as plants. The plants synthesize their food by the process of photosynthesis. Some commonly found plants are trees, shrubs, and grasses. Plants have a significant role in ecosystems as they generate most of the oxygen in the world. They are also important in the food chains because many organisms consume plants, or they consume organisms that consume plants. Botany is the field in science that studies plants. Many of the plants possess vascular tissues like the phloem and xylem, that carries nutrients and water throughout the plant. The photosynthesis process occurs in the cell organelles known as the chloroplasts. These chloroplasts contain carotenoids and chlorophyll molecules that can absorb the light energy and converts it into a form that can be usable. In many ecosystems, the plants are known to be the producers and hence they are required for the various other organisms to survive. Plants consist of eukaryotic cells that are relatively large and possess a true nucleus along with various organelles that have specific functions. The plant cells are different from the other cells because they have a cell wall, they contain chloroplasts, cellulose and they also possess a large central vacuole. Plants can either undergo asexual reproduction or sexual reproduction.

The multicellular fungi undergo reproduction by making spores. Mold is known to be a multicellular fungus. It contains filaments that are known as hyphae, and these hyphae tangle together to form the structures known as the mycelia. The septate hyphae have walls present between the cells of the hyphae, whereas the hyphae that do not have cell walls present between the cells are known as coenocytic hyphae or non-septate hyphae. Some other examples of multicellular fungus include mushrooms, Rhizopus stolonifera, etc. The R. stolonifera is a type of bread mold that can also cause blight in the rice seedlings. A characteristic feature of fungi is the presence of chitin in its cell wall. Fungi do not undergo the process of photosynthesis, and they are known to be heterotrophs. Most of the fungi display two morphological stages: the reproductive stage and the vegetative stage.


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