Give a reason why most of the stomata of the water lilies are found on the upper side of their leaves?
101328
stomata  are  mini  factories  that  use  sunlight  to  convert  co2 gas and water  to  simple sugars [glucose]   they  also  reverse  and  give off  watervapor  and  oxygen ......stomata  on the  lower  side  wouldnot  allow  the  rays  of  the  sun  to  reach them...though  certain  rays  could  penetrate the the  leaves...thewavelengths  needed  wouldnt  be  there
976958
Palisade mesophyll is the top layer of mesophyll, and it has the most exposure to the sun. It differs from the structure of spongy mesophyll in that it is tightly packed and arranged almost geometrically. This is to optimize the collection of light, and maximize the surface area that is exposed to light. There is also a tiny gap between each cell to allow water through (by capillary action) as well as CO2. Palisade cells also have the most chloroplast. Sun-loving plants tend to have a thicker palisade layer.\n\nIn comparison, spongy mesophyll is arranged loosely, to allow air in between the cells. It is lower down in the leaf, and does not receive as much sunlight, so it also has fewer chloroplasts.
61042
Yes. It does. Since there is more sugar in the water outside of the plant than there is in the water in the plant, the sugar solution will be hypertonic (higher concentration of solutes). This will cause osmosis to occur, causing water to flow out of the plant and into the sugar water to equilize the content. This will drain the vacuoles in the plant cells, and cause them to shrivel up inside of the cell wall.
781134
since water likes to travel from an area of higher concentration to lower concentration, the cells of a plant living in mostly salt will have very little water.  the cell of this plant will appear more thin and streamlined as they are not puffed up by the additional water.
1055798
The problem is the transport of water to the top. Depending on the species, the power of the capillaries is limited (perhaps the wrong word, I'm not so common with biology in English).
678873
One of the difficulties that water plants have that land plants do not is gas exchange.  Plants need to be able to get air to their roots and aquatic plants usually do this through special tissues that lead to the air.
782698
it is comonly seen that vein like structures on leaves look like hearts. it is also a cause of build up of chloroplast in the base of veins. rather like bursting a blood vessel in a human.
215019
Like the Dude said above.. they have flowers above the water.\nFlowers get pollinated, seeds grow, seeds are distributed thru the water, fall to the bottom and grow the next generation... its a circle of life thing.
1111723
They don't. \n\nThe stems of water lilies and lotuses for example are very thick corms, thicker than a man's forearm. The stems of bullrushes are as thick as any similar type of plant, the stems of Myriophyllum are at least as thick as your average herbaceous land plant. The stem of bullkelp are thgicker than your arm and easily as thick as the trunk of any tree of equivalent size\n\nWhat makes you think that aquatic plants have thin stems? And can you name any aquatic plants that have stems that are significantly thinner than similar land plants?\n\n\nMaybe then we will have some idea what you are talkng about.
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)
681008
Plants respire through stomata... valve-like openings on the underside of their leaves.
414488
um! thru the stomata?
360436
that may just be for the beginning of it's growth eventually it will stop growing because of lack of sunlight and it may be that the sun is drying up the water in the other plant in the sun
748520
some epiphytic plants grow on the trunks of tropical evergreen forests .The epiphytic plants have their roots hanging in the air for absorption of water, as they do not have contact with direct soil.Thesee plants are not parasites. may be the plant u have has its guest plants seeds, or little root system on it SO it is allowing  its growth
1095799
lol they wilt when they do not have enough water-Imagine you have a long thin balloon with no air in it. The balloon will fall over itself when you try to stand it in an upright position. When you blow air into the balloon, it can stand in an upright position because the air is exerting pressure on the walls of the balloon. In plants, it is not air which exerts pressure, but water. The plant needs water to support it in an upright position and if it loses too much, it will wilt.\n\nIn plants, the exertion of pressure occurs at the cellular level and is called 'turgor pressure'. You can simulate wilting in the cells by placing some plant cells in a strong salt or sugar solution which will draw water out of the cell. Under a microscope you will be able to observe how the cell membrane pulls away from the cell wall withdrawing the support given to the wall.\n\nand they wilt in cold weather! \nGood luck in your exams!!
511535
Water rushing into the guard (or is it guardian) cells is the mechanism responsible for the closing of stomata.\n\nI would reason that the opposite is true for opening.\n\n\nBut what causes the plant to close or open? Several factors:\nTemperature\nWater Loss\nHumidity\nCarbon Dioxide concentrations.
243988
They are located on top of the tylikoid in the chlorplasts.