what are the mechanisms of transpiration?
452812
transpiration refers to the evaporation of water from plants.\n\nwater in ground -> pulled by plant's roots through osmosis -> water moves through inner layer of dermal cells -> water from cell membranes move into the xylem (which is the root's core) -> water moves into leaf cells -> water exits though the stomata after being vaporized by heat
780599
Water equalizes the pressure between the outside and the inside of the cell wall, so it doesn't become damaged.  It also is the transport medium for nutrients coming in, and waste exiting.
786061
Homeostasis.\n\nFor more specifics about plants look at the bottom of the second source.
605258
Recycling. Electrolyse of water. Plants give O2.\nCompressed and deep cooled liquid O2.
505659
That is xylem.\nPhloem transports manufactured materials, e.g. sugars.\nLook here:
337412
The answer you are looking for is in the soil-plant-atmosphere continuum.  I'm too tired to give a full answer now so I will come back to this.\n\nIt basically works on negative pressure.  Air is the driest in the continuum and pulls water through the stomates from the xylem (not the phloem) up the stem from the roots, from the soil.\n\nI'll come back later.
567750
During the plant's growth period, usually during the spring, storage organs such as the roots are sugar sources, and the plant's many growing areas are sugar sinks. The movement in phloem is bidirectional, whereas, in xylem cells, it is unidirectional (upward).A high concentration of organic substance inside cells of the phloem at a source, such as a leaf, creates a diffusion gradient that draws water into the cells. Movement occurs by bulk flow; phloem sap moves from sugar sources to sugar sinks by means of turgor pressure. A sugar source is any part of the plant that is producing or releasing sugar.
449266
Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration...
17761
Flowers drink water with a capillary action.  Capillary action happens when water molecules are more attracted to the surface they travel along than to each other. In paper towels, the molecules move along tiny fibers. In plants, they move through narrow tubes that are actually called capillaries. Plants couldn't survive without capillaries because they use the water to make their food.  There is an experiement you can try at the link below.
92590
In order to absorb water the concentration of the cell sap in the plant, especially in the root cells, must be at a lower level than that of the watery solution in the soil. When you put any water soluble salt in the water and ‘offer’ it to the plant, then due to the higher concentration of the salt outside; the water from the plant will be ‘sucked out’ resulting in the wilting and then death of the plant. It is called reverse osmosis. The plants and the trees that grow in the salty soil always have their cell sap concentration greater than the surrounding salty water. This is ecological adaptation. In short, the flow of water, in the living plants, is from the solution of lower concentration to the solution of higher concentration. This is Proper OSMOSIS.\nNow tell me can you drink water with very high amount of table salt in it?
930391
Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration.
177314
Xylem in the stem, as xylem is responsible for transport of water
682340
it is the potassium pump mechanism which pumps k+ ions actively ind other ions like cl-, malate ions enter passively and thereby increasing the solute potential of the guard cell and increasing the turgidity\n\nbut the cellulose micro fibrils do not allow radial expansion of the cell\n\ntherefor the guard cell's outer wall expand but due to thickening of inner wall it can't expand!!\n\nthere for along with the outer thin wall, the inner wall is also being pulled out!!!\n\ntherefor increasing the width of the stomatal pore and causing stomatal opening!!!!!!!!!!!!\n\nalso he wise versa
119409
(if you need this for homework, please rewrite it in a coherent way!)\nThe plants that live in xeric (=dry) environments are called xerophytes and have many adaptations that help reduce water loss. Basically these include mechanisms for 1) reducing body surface (because evaporation/transpiration is directly proportional to body surface) and 2) reinforcing their "skin" to make it less permeable.\n\nAdaptations tending to 1) include:\n- Small and thick or absent leaves, may be transformed into spines; they photosinthesize with their stems (such as cacti)\n- Short, stumpy shape; rounded stems.\n\nAdaptations tending to 2) include:\n- Leaves with multilayered epidermis and a thick waxy cover (waterproof)\n- Leaves may be covered with hairs.\n- Small stomata, situated in recessed crypts\n- Some have the stomata open only during the nighttime (CAM metabolism)
1030327
The plant leaf is covered with  a waterproof waxy layer called the cuticle.  The lower leaf surface contains small holes called stomata.  These stomata allow gases to enter and leave the leaf. The only way water can enter a plant is through it roots.  Water vapor leaves the leaf pulling on the water in the xylem that has been absorbed by the roots.  Water thus goes in one direction from the roots, to the xylem, to the leaf, and then out into the atmosphere.  If you have ever been in a tropical setting it always seem very humid.  This is caused by all the water leaving the plants through their leaves.
278197
none, nil, nada, zip\n\nalcohol dehydrates and plants need water to grow.
946425
Dude / dudette.\n\nCheck your local search engine.\n\nWatch a plant in your garden, for gawdsakes.  Plants wilt without water, so it's a fair bet that water fills the cells - perhaps the cell walls?\n\nHere's a passage ripped off from a website:\n\nWater acts as a SOLVENT for minerals and stored food that must be moved through the plant. Water evaporation on the leaf surface helps cool the plant during very hot weather in the same way that perspiration keeps us cool. \n\nPlants even require water during winter. Water is absorbed through and stored in roots for winter. When soil is frozen, water movement is very restricted. On windy winter days, leaves of broadleaf evergreens, such as rhododendrons, may curl to reduce water loss. Curling reduces the amount of leaf surface exposed to drying winds, reducing evaporation. Continued water loss may cause tissue to die and turn brown. This kind of plant injury is called desiccation. It is critical that broadleaf evergreens have an adequate supply of soil moisture going into winter.