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Organ systems in plants..

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by Zac Demelo on 13 February 2013

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Transcript of Organ systems in plants..

From Root..... Pulling and pushing ...To Leaf Organ systems in plants Connecting the Systems (Tissues) In humans, our tissues are mainly for things that plants don't even do, like moving and thinking, but just as we have connective tissue for our blood transport plants have tissues for their main functions; Transporting energy and water. In the plant the VASCULAR tissues connect the plant main systems (the root and shoot). PHLOEM tissues transports the energy made in the leaves through photosynthesis to the rest of the plant. Meanwhile XYLEM tissues take the water conducted in the root system, and move them into every cell in the plant (remember all cells need water to survive). Both tissues generally occur together in the stem and roots of the plants and are surrounded by other tissues to help protect and support them. One way to view the different levels of organization in nature is to look at the transportation of water through a plant. The water starts here in the soil, from the rain the soaked down. If you look at the roots, you will see that its tips are covered with fine hairs called ROOT HAIRS. They are actually thin lines if epidermal cells. They use osmosis and act like straws. When there is more water in the soil than in the root hair, they will suck it up like cellular straws. This shows the first level of organization; cells. Next the water will continue to travel up the hairs through osmosis until they reach the XYLEM TISSUE. They have thick walls with hollow centers and act, once again like bundles of straws. As the water builds up in the hairs it also creates pressure which pushes the water further up the XYLEM TISSUE. Now we have the second level; tissues. If you were to vaporize a plant but leave the water in it in place you would see a stringy outline of the plant. This is because there is no break in the water system. Even beyond the plan,t in the soil because the water connects the channels of water in the soil to the root hairs. In particle theory, it states that water particles are held together by bonds of attraction, which makes this water system one bug thing together. The water that is drawn into the plant by osmosis in the root hair PUSHES on this system up the plant. Also the water exiting the plant by transpiration through the stomata PULLS the water up the xylem tissue. This pushing and pulling acts as a device to raise water up even the tallest trees, it also eliminates the need for pumping organs like the heart. Organ Systems in plants Our water has traveled up the Xylem express up the stem here, to the leaves. Leaves are a plants food-producing organs, ORGANS are the third level of organization. For a plant to make sugars (food) out of water, carbon dioxide and sunlight the process of photosynthesis happens. It happens here in the leaves in a layer of cells called PALISADE CELLS, they lie just beneath the surface of a leaf, and are full of chloroplasts. On the underside of the leaf are tiny openings called STOMA or STOMATA( Plural). They are open to allow air into the leaf so the cells can breath (oxygen) and perform photosynthesis (carbon dioxide). Around the stoma are GUARD CELLS which can close the stoma if needed. Why, you may ask, because unlike in humans, the water does not circulate. So after going through the fourth and final level of organization the organ system of root and shoot, the water has to leave the plant through the stomata. The stomata close when the plant cannot afford to lose water, such as in drought. You may notice that plants can't move and don't have muscles. This is because they don't need to move to get what they need. They get their energy through photosynthesis which uses air (carbon dioxide) and water (in the soil) Plants use roots for the water and leaves for their air and also for the energy to convert them into sugars by using the sun's power. Plants also don't need nervous systems because they don't need to coordinate movement. They lack a digestive system because they don't eat anything, and they have no senses because they don't need to hunt for food. Lastly they don't need an advanced reproductive system because insects help with that through pollination. Plants have their own systems though; the root system, which takes water and minerals from the soil and anchors the plant down, and the shoot system, which makes food for the plant Plants like this oak tree here >> don't need to move so they don't have feet or muscles A diagram of both tissues located together in the stem of our plant Root hairs as seen from under a microscope Just as animals have adapted to help them survive in their environments, plants to have adapted. Take our "Oak Tree of Science" here. it has made its seeds in an apple or sorts. This means that animals with eat it and when they dedicate the seeds will be put into the ground with a free fertilizer and by freeloading in an animal it helps the seeds spread out better. Another example is a pitcher plant, it lives where the soil is poor in nitrogen (a vital nutrient for plants) so its leaves are shaped like a pitcher and filled with sweet smelling digestive fluids. Insets are attracted to this and get trapped and absorbed; the plant gets its nitrogen.
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