why plants adjust the water intake when we give more water?
Plants take in water through their roots, and green ones use it in photosynthesis, which is how they create sugar for food. Plants also need water to support themselves. Pressure from the process of osmosis -- the movement of water from the outside to the inside of the plant's cells -- keeps up the plant's cell walls.When you water a plant, it sucks up the water through capillary action. Then the water travels from the roots through tubes called xylem vessels. Water reaches the leaves of the plant and escapes through small holes called stomata, which open when the plant needs to cool down. This process is called transpiration and is similar to how people (and some animals) sweat. Carbon dioxide also enters the plant through the stomata.Some plants have also found unique ways to live with little or no water. One way is a variation of photosynthesis called Crassulacean Acid Metabolism (CAM) photosynthesis. In CAM photosynthesis, a plant stores carbon dioxide as acid and keeps its stomata closed during the day to save water (evaporation happens at a slower rate at night). It can even keep its stomata closed at all times if conditions are especially arid. Cacti use CAM photosynthesis to survive the extreme heat and drought of the desert.