what is difference between roots of terestrial plant and aquatic plant?
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Land plants are highly specialized for their lifestyles. They get their nutrients from two sources: soil and air. It is the job of roots to absorb water and minerals from the soil, as well as hold the plant in place. Essential materials are transported to cells in leaves by a system of tubes called vascular tissue. Leaves are in charge of taking in carbon dioxide gas from the atmosphere for photosynthesis. Once photosynthesis is complete, a second set of vascular tissue carries the food made by the leaves to the rest of the plant. Land plants are also equipped with woody stems and branches that hold them upright so that they can receive plenty of light.
Marine plants, called macroalgae or seaweeds, get their nutrients, water, and dissolved gases from seawater. Since water surrounds the entire marine plant, these dissolved nutrients simply diffuse into each cell. For this reason, marine plants do not have vascular tissue to accommodate photosynthesis or to carry its products to each cell. In addition, marine plants do not need support structures because they are held up by the buoyant force of the water. Since water in the ocean is always moving, the bodies of marine plants are flexible, permitting them to go with that movement. Some marine plants secrete mucus to make their surfaces slick, further reducing their drag or resistance to water movement. Mucus also helps keep animals from eating them.
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Aquatic plants are those that live and thrive in water, they often root in the benthic medium underneath the water. Others live entirely in the water with the roots drawing nutrition from the water itself. Others live with roots submerged in the water and the body of the plant out of the water in the air.
Terrestrial plants live entirely on land and would drown if submerged in water for more than a few hours.
There are also plants and trees that live both in and out of water such as some mangrove species whose roots are submerged for part of their day and terrestrially for part of the day, usually in response to tidal neaps/ebb and flow.