Water is split by the process of photolysis in photosystem II. That oxygen is released into the atmosphere during the light reactions. At night when the calvin cycle takes over there is no oxygen produced. The oxygen does not come from carbon dioxide. ATP-Man · 9 years ago.
https://answers.yahoo.com/question/index?qid=20071116175605AAlp2Cf
All of these answers are correct. [large chloroplasts with numerous starch grains, high concentrations of PEP carboxylase in mesophyll cells, higher optimum temperatures for photosynthesis than C3 plants, small chloroplasts with well-developed grana]
https://quizlet.com/19892579/chapter-10plant-metabolism-flash-cards/
These organisms use oxygen in respiration, similar to organisms on land. Fish and crustaceans obtain oxygen for respiration through their gills, while plant life and phytoplankton require dissolved oxygen for respiration when there is no light for photosynthesis 4.
http://www.fondriest.com/environmental-measurements/parameters/water-quality/dissolved-oxygen/
Joshua Engel is correct that all oxygen was formed in stars, most of it in the later stages of stellar evolution. Oxygen and other heavy elements on Earth are evidence that Earth formed from the stellar debris of a supernova as well as interstellar gases. Only the lightest elements (hydrogen, helium, lithium and perhaps traces of slightly heavier elements) could be formed in the Big Bang itself. Oxygen itself comes from the late stages in the life of a star, when the star fuses helium to form even heavier elements.
https://www.quora.com/Where-did-the-oxygen-on-Earth-come-from
Best Answer: The oxygen released comes from the water. Reason-The chlorophyll after absorping photons from light becomes activated.Then this activated chlorophyll helps in photolysis or breaking down of water into H+ and OH-.Then these reactions occur, 4(OH)- → 4(OH)+4e-. 4(OH) → 2H2O+O2 (or hydrolysis of water) So oxygen is produced from water.
https://answers.yahoo.com/question/index?qid=20130217211215AAG8ZTH
Best Answer: The oxygen released comes from the water. So oxygen is produced from water. Photosynthesis combines water and carbon dioxide into sugars, leaving oxygen gas as a waste product. I thought the oxygen came out of both carbon dioxide and water.
https://answers.yahoo.com/question/index?qid=20130217211215AAG8ZTH
Non-compound oxygen, or free oxygen (O2), is oxygen that is not bonded to any other element. Dissolved oxygen is the presence of these free O2 molecules within water.The bonded oxygen molecule in water (H2O) is in a compound and does not count toward dissolved oxygen levels. One can imagine that free oxygen molecules dissolve in water much the way salt or sugar does when it is stirred ².
http://www.fondriest.com/environmental-measurements/parameters/water-quality/dissolved-oxygen/
While water equilibrates toward 100% air saturation, dissolved oxygen levels will also fluctuate with temperature, salinity and pressure changes ³. As such, dissolved oxygen levels can range from less than 1 mg/L to more than 20 mg/L depending on how all of these factors interact.
http://www.fondriest.com/environmental-measurements/parameters/water-quality/dissolved-oxygen/
This means that warmer surface water requires less dissolved oxygen to reach 100% air saturation than does deeper, cooler water. For example, at sea level (1 atm or 760 mmHg) and 4°C (39°F), 100% air-saturated water would hold 10.92 mg/L of dissolved oxygen.
http://www.fondriest.com/environmental-measurements/parameters/water-quality/dissolved-oxygen/
Cyanobacteria produce oxygen through photosynthesis, and the oxygen they emit eventually saturated the reducing iron (as well as other mineral and organic sinks) near the surface of the Earth's crust.
https://www.quora.com/Where-did-the-oxygen-on-Earth-come-from
where does the oxygen liberated in photosynthesis come from? quizlet
The oxygen liberated in photosynthesis comes from water. The oxygen liberated in photosynthesis come from water.