what time in morning does tree leaves excreting oxygen most?
550742
Dawn or as the sun rises.
1161700
None at all. You have bought into an urban myth. Trees in the Amazon don't produce any oxygen. Not even one little bit.\n\nAN OFT-HEARD WARNING with regard to our planet's future is that by cutting back tropical forests we put our supply of oxygen gas at risk. Many good reasons exist for placing deforestation near the top of our list of environmental sins, but fortunately the fate of the Earth's O2 supply does not hang in the balance. Simply put, our atmosphere is endowed with such an enormous reserve of this gas that even if we were to burn all our fossil fuel reserves, all our trees, and all the organic matter stored in soils, we would use up only a few percent of the available O2. No matter how foolishly we treat our environmental heritage, we simply don't have the capacity to put more than a small dent in our O2 supply. Furthermore, the Earth's forests do not play a dominant role in maintaining O2 reserves, because they consume just as much of this gas as they produce. In the tropics, ants, termites, bacteria, and fungi eat nearly the entire photosynthetic O2 product. Only a tiny fraction of the organic matter they produce accumulates in swamps and soils or is carried down the rivers for burial on the sea floor.
417324
"The forests of the taiga are largely coniferous, dominated by larch, spruce, and pine. Evergreen species in the taiga (spruce and pine) have a number of adaptations specifically for survival in harsh taiga winters, though larch, the most cold-tolerant of all trees, is deciduous. Because the sun is low in the horizon for most of the year, it is difficult for plants to generate energy from photosynthesis. Pine and spruce do not lose their leaves seasonally and are able to photosynthesize with their older leaves in late winter and spring when light is good but temperatures are still too low for new growth to commence. The adaptation of evergreen needles limits the water lost due to transpiration and their dark green color increases their absorption of sunlight. Although precipitation is not a limiting factor, the ground freezes during the winter months and plant roots are unable to absorb water, so desiccation can be a severe problem in late winter for evergreens.\n\nAlthough the taiga is dominated by coniferous forests, some broadleaf trees also occur, notably birch, aspen, willow, and rowan. Many smaller herbaceous plants grow closer to the ground. Periodic stand-replacing wildfires (with return times of between 20-200 years) clear out the tree canopies, allowing sunlight to invigorate new growth on the forest floor. Grasses grow wherever they can find a patch of sun, and mosses and lichens thrive on the damp ground and on the sides of tree trunks. In comparison with other biomes, however, the taiga has a low biological diversity."
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.
1058780
Lots trees bloom first, then leaf out. Most of our spring flowering trees in the East and Midwest, most fruit trees, etc...Think of all the decorative trees...Dogwoods, redbuds, flowering peach, Almond, crab apple, etc. ...all bloom, then leaf out.
534829
Check these factors out\n\n1.  The amount of pollutants in the air are lower at night\n2.  The amount of oxygen released by plants is maximum at night and C02 levels are least reduced.\n3.  Humidity levels are generally high at night\n4. Charged particles are less at night, because there is no more "ionizing" sunlight (smell is an electrochemical process\n\nI could think of other reasons, but I'm out of ideas.
939967
When the sunlight enters the Earth's atmosphere, it scaters. The light passes throught the molecules of gases in the air and scates. The only one colour that is visible to us most of the time is blue. During sunrise and sunset, the sunlight has to go through more atmosphere and the blue changes to reds, oranges and purples.
956897
Leaves turn colors in the fall because the tree stops supplying the leaf with water.  This stops the process of photosynthisis which is where the chlorophyll in the leaf changes sunlight into energy.  The green chlorophyll start turning yellow, red and brown for lack of food.  The leaves fall off the tree and die, allowing the tree to store water for winter and live on until spring.
878227
if you're talking about plant cells, then it is for photosynthesis, the plant's way of making food. This is how it works.\n\nthe plant takes in carbon dioxide, water, and light. These are processed in the cell's chloroplasts and food is produced. The by-products of photosynthesis are sucrose (sugar) and oxygen, which is why we depend on rain forests and plants to give us a continuous supply of oxygen. In goes CO2 and out comes Oxygen!!
804350
Plants don't inhale oxygen, they "inhale" carbon dioxide and release it to make oxygen.
521847
I think this is what you're after.\n\nIt is an accident of astronomy that our earth has a tilt of 21.3 degrees.  (That's the current tilt ... it ranges between 21 and 25 degrees every 41,000 years.)  \n\nAs a result, trees far away from the equator see a variable amount of sunlight over the course of one journey around the sun (one year).  Trees (such as palm trees) near the equator (specifically between the tropics) do not see much variability in the sunlight, so the following does apply to them.  \n\nWhen tilted towards the sun, the days are longer, and the sun higher in the sky, and the tree wants as much area dedicated to photosynthesis as possible.  So leaves are good.  \n\nBut when tilted away from the sun, the days are shorter, the sun not as high up, and photosynthesis is more difficult.  The leaves are a premium ... they're consuming more food than they are producing with photosynthesis.  Plus, with temperatures dropping, water in the leaves is in danger of freezing, which burdens the branches with so much extra weight that they can break.  So it is better to shed those leaves for that part of the journey around the sun.  (This is less of a problem with trees, like pine trees, that have needles instead of leaves.)\n\nIs that what your after?  (Great question!)
103120
Well, first of all you should rephrase your question "Do decidious or evergreen trees produce more oxygen (since evergreens have leaves).\n\nIn general, decidious trees do produce more oxygen.  A lot of this has to do with them living in warmer climates where they are more productive (eventhough they loose their leaves seasonally).  But evergreens do produce oxygen almost year-round (less is colder seasons).\n\nIt is important to note that trees use most of the oxygen they produce.
1056481
morning.  because water + sun = food (for plants) water them int he morning
860600
The amount of O2 produced depends on the rate of photosynthesis, \nnot the breadth of the leaves.  Fast growing plants under good \nconditions produce the most O2.
9720
8:41 AM\n\nGood Morning :) \n\nUS Eastern
515620
Exercise in the MORNING.
1116831
Diffusion of carbon dioxide and oxygen take place in the alveolar of the lungs.  Since there is a higher concentration of oxygen in the alveolar sac as compared to the capillaries surrounding it, the oxygen goes from the higher concentration to that of the lower concentration.  The carbon dioxide is more concentrated in the capillary blood than the alveoli. so it diffuses into the lungs.  \n\nIn photoynthesis water must diffuse into the plant or bacterial cell.  It is then destroyed in what is commonly called the light reactions.  It is separated into Hydrogen ions and oxygen.  The oxygen is released into the air via diffusion and the Hydrogen ions are used to produce ATP.  Since the water is used up more is needed to keep the process up. So more water diffuses into the cell.  In order for tthe palnt to make food from the carbon dioxide that has diffused into the cell as well. It must enter the chloroplast.  Here the Dark reactions of the process occur.  The carbon dioxide is used up along with some of the ATP to make sugar.  SO as the sugar is made and relocated this creates a carbon dioxide deficit in the chloroplast.  So more Carbon dioxide diffuses into it.  This continues until the process stops or the plant dies.