How can we test for the necessity of water for photosynthesis?
414377
Actually U cannot test da water need in photosynthesis. Because da two rules in all experiments to test da agents of photosynthesis r, That da plant should be destarched\nand Da experiment should be controlled. But in the case of water u cannot control water..
121344
All green plants need light to make carbohydrates,their food, which in common terms we say starch,thro' photosynthesis.For this photosynthesis, plant requires Sunlight,chlorophyll & water.
47495
I would say the Sun. You need it in order to create evaporation to create the clouds that produce rain. Without it, there would be no rain.\n\nAfter reading the additional comments, the sun is still more important than rain. Sure, we can create our own light but it isn't economically feasible to create enough sources of light for plants to photosynthesize and create Oxygen for us to breathe. The Sun's light covers a much wider area than we could imagine or build for, at least economically speaking.\n\nWe can live without water for a short time, but we can't live without oxygen. If the plants stop producing oxygen because of lack of light, we'll die even if we have an abundance of water.
949698
Chlorine is required in photosynthesis as an enzyme activator during the production of oxygen from water (13).\n\nAn excess of chlorine will result in burning of leaf margins and pre mature loss of leaves
53458
Plants take in oxygen, carbon dioxide and water, and produce sugar which contains carbon, oxygen and hydrogen atoms from all three. So they use more water than they put out. In fact, I don't believe they "exhale" water the way we do at all,
947750
Water and "nutrients" depending on the specific type of cell. Plant cells need inorganic nitrogen compounds (ammonia, nitrate), phosphate, iron, magnesium, manganese, copper,...\nAnimal cells need organic substances like sugars or amino acids (which plant cells can produce on their own) additionally to vitamins and ions (iron, copper, cobalt, zinc, molybdenum, iodine, selenium,...)
1081301
Yes, during photosynthesis, plants and trees take in carbon dioxide and release oxygen into the atmosphere.  For this reason, planting trees is encouraged !
207951
Plants can sustain photosynthesis (and release oxygen) from any lightsource that has enough energy. But plants can also get stressed by too much light and actually get sick. They might also grow in unnatural ways, like growing sprouts all over, if "fed" the wrong amount of light for too long periods of time. \n\nPlants are tuned to natural light during ordinary hours but some plants can even "OD" on sunlight. When the sun shines too hot during a hot day they sometimes shutdown photosynthesis and begin to perspire. \n\nIt all comes down to what kind of plant it is. An ordinary house plant should release oxygen if the artificial light is not too intensive.
798097
http://en.wikipedia.org/wiki/Photosynthesis#Factors_affecting_photosynthesis\n\n=)
29977
photosyntheses is the way plants make food. the plants make their food by getting sun, water and carbon dioxide and then the plant uses the carbon dioxide (which we breathe out) and lets out oxygen , without any plants we would run out of oxygen.
851726
Sunlight is necessary for plants to grow, and to provide energy to warm the earth's atmosphere. Light intensity controls plant growth. Light duration affects plant flowering and animal/insect habits.\n\nNow, during photosynthesis, sunlight energy is used to power chemical reactions that combine water with the air's carbon dioxide to form starchy carbohydrate. In other words, during photosynthesis, sunlight energy is stored in carbohydrate for later use. Here's the simplified chemical formula for photosynthesis:\n\n6CO2 + 12H2O + sunlight ---> 6O 2 + C6 H12O 6 + 6H2 O\nor...\ncarbon dioxide + water + sunlight ---> \noxygen + carbohydrate + water \n \n\nSome carbohydrate remains in the leaf but mostly it's transported elsewhere in the plant, perhaps into the stem, or maybe into special underground storage areas, such as the potato plant's potatoes.
338231
Photosynthesis is the process by which plants, some bacteria, and some protistans use the energy from sunlight to produce sugar, which cellular respiration converts into ATP, the "fuel" used by all living things. The conversion of unusable sunlight energy into usable chemical energy, is associated with the actions of the green pigment chlorophyll. Most of the time, the photosynthetic process uses water and releases the oxygen that we absolutely must have to stay alive. Oh yes, we need the food as well!
1116859
only if they are growing (the balance is called net photosynthesis rate). but when the conditions are not favourable for photosynthesis, they may get into "red numbers", negative net photosynthesis rate, like when they are wilting and/or it is too hot, they respire more than the photosynthesize. generally in temperate region water supply is the limiting factor, in sea it is the light that rapidly gets low when we get deeper.
996758
Most likely through photosynthesis. Billions of plants can't be wrong.
787495
If we want to prove that starch is present in photosynthesis steps are as follow:\n1)Take some food material like wheat flour.\n2)Put it in a test tube and add some water in it.\n3)Add some iodine solution a blue black colour shows the presence of starch.
925453
well photosynthesis is a good way to start. the water from the roots are pulled by cohesion and then it leaves from the stroma in the plant leaves.
819828
Photosynthesis is the process of converting light energy to chemical energy and storing it in the bonds of sugar. This process occurs in plants and some algae (Kingdom Protista). Plants need only light energy, CO2, and H2O to make sugar. The process of photosynthesis takes place in the chloroplasts, specifically using chlorophyll, the green pigment involved in photosynthesis. \n\nPhotosynthesis is the process by which plants, some bacteria, and some protistans use the energy from sunlight to produce sugar, which cellular respiration converts into ATP, the "fuel" used by all living things. The conversion of unusable sunlight energy into usable chemical energy, is associated with the actions of the green pigment chlorophyll. Most of the time, the photosynthetic process uses water and releases the oxygen that we absolutely must have to stay alive. Oh yes, we need the food as well!\n\nWe can write the overall reaction of this process as: \n\n6H2O + 6CO2 ----------> C6H12O6+ 6O2\nMost of us don't speak chemicalese, so the above chemical equation translates as:\n\nsix molecules of water plus six molecules of carbon dioxide produce one molecule of sugar plus six molecules of oxygen\n\n\nDiagram of a typical plant, showing the inputs and outputs of the photosynthetic process. Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com), used with permission.\n\nLeaves and Leaf Structure | Back to Top\nPlants are the only photosynthetic organisms to have leaves (and not all plants have leaves). A leaf may be viewed as a solar collector crammed full of photosynthetic cells.\n\nThe raw materials of photosynthesis, water and carbon dioxide, enter the cells of the leaf, and the products of photosynthesis, sugar and oxygen, leave the leaf.\n\n\nCross section of a leaf, showing the anatomical features important to the study of photosynthesis: stoma, guard cell, mesophyll cells, and vein. Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com), used with permission.\n\nWater enters the root and is transported up to the leaves through specialized plant cells known as xylem (pronounces zigh-lem). Land plants must guard against drying out (desiccation) and so have evolved specialized structures known as stomata to allow gas to enter and leave the leaf. Carbon dioxide cannot pass through the protective waxy layer covering the leaf (cuticle), but it can enter the leaf through an opening (the stoma; plural = stomata; Greek for hole) flanked by two guard cells. Likewise, oxygen produced during photosynthesis can only pass out of the leaf through the opened stomata. Unfortunately for the plant, while these gases are moving between the inside and outside of the leaf, a great deal water is also lost. Cottonwood trees, for example, will lose 100 gallons of water per hour during hot desert days. Carbon dioxide enters single-celled and aquatic autotrophs through no specialized structures.\nVirtually all oxygen in the atmosphere is thought to have been generated through the process of photosynthesis. Obviously, all respiring organisms (including plants) utilize this oxygen and produce CO2. Thus, photosynthesis and respiration are interlinked, with each process depending on the products of the other. The global amount of photosynthesis is on the order of a trillion kg of dry organic matter produced per day, and respiratory processes convert about the same amount of organic matter to CO2. A large part (probably the majority) of photosynthetic productivity occurs in open oceans, mostly by oxygenic prokaryotes. Without photosynthesis, the oxygen in the atmosphere would be depleted within several thousand years. It should be emphasized that plants respire just like any other higher organism, and that during the day this respiration is masked by a higher rate of photosynthesis.