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Does Photosynthesis Occur at Night? | Sciencing

At night, when the stomata open, carbon dioxide enters the leaves and gets trapped inside.

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"Does Photosynthesis Occur at Night?"

Well, not really. The amount of oxygen the plants in your bedroom use at night is trivial. Think about the earth as a giant bedroom and you’ll see that animals would be in pretty big trouble if plants used up a significant amount of oxygen every night.

So how do they fulfill their energy requirements at night when they can't resort to photosynthesis?

A limiting factor is a factor that controls a process. Light intensity, temperature and carbon dioxide concentration are all factors which can control the rate of photosynthesis. Usually, only one of these factors will be the limiting factor in a plant at a certain time. This is the factor which is the furthest from its optimum level at a particular point in time. If we change the limiting factor the rate of photosynthesis will change but changes to the other factors will have no effect on the rate. If the levels of the limiting factor increase so that this factor is no longer the furthest from its optimum level, the limiting factor will change to the factor which is at that point in time, the furthest from its optimum level. For example, at night the limiting factor is likely to be the light intensity as this will be the furthest from its optimum level. During the day, the limiting factor is likely to switch to the temperature or the carbon dioxide concentration as the light intensity increases.

6 Answers - How does photosynthesis work at night? - …

I believe that it is not possible for any plant to give off O2 when it cannot do photosynthesis.

I’m actually curious about this – Because over-planting a small pond, and having the plants use up too much oxygen during the night to the point that the fish die or are gasping for air at the surface by morning because of it, is a not uncommon problem. Would you know why there is such a difference? Like do aquatic plants have higher oxygen usage in a lower oxygen environment, perhaps, or it’s a more enclosed space with much higher percentage of plants per area, or something else?

I have koi in outside fish ponds. At times during the long summer days there is an occurrence called an algae bloom where the water in the pond becomes filled with very small suspended algae. During the day there is no problem with the respiration of the koi that I have in the pond… but because the algae use up so much available oxygen during the night and do not add any O2 to the water…my koi in the very early morning hours before the sunlight starts photosynthesis of the algae run out of the amount of oxygen they need for respiration and are forced to breathe atmospheric O2 at the surface of the pond! They gasp for O2 out of the water from the atmosphere where there is enough available for them to survive. My point is in water ponds there is a semi closed environment where plants can use up so much oxygen at night that they force the fish to get their oxygen elsewhere. When days become shorter the algae bloom will naturally diminish if I wait it out and do not do massive water changes or resort to killing the floating algae with a chemical plant killer algaecide that will not kill my fish if used in the proper doses. Plants do use O2 at night and do not give off any O2 in darkness!

26/05/2016 · How does photosynthesis work at night

Good article and all the stories that plants use massive oxygen during night are myths.

Plants produce carbon dioxide all the time becauseof respiration, but during the day (when there is light), they use CO2 forphotosynthesis, and fix CO2 into othermolecules, giving as end product O2more than CO2. Thisis why it is called carbon fixation. On the otherhand, when it is dark, plants do not have anenergy source for photosynthesis, and so cannotfix CO2 and produce O2. Theprocessis light-independent, andmore formally known as the Calvin cycle.During this cycle, 3 carbondioxide molecules are absorbed to produce thesmall sugar G3P(glyceraldehyde-3-phosphate) for the plant to useelsewhere. Two G3Pmolecules are required to make glucose.

As for comparing the amount of carbon dioxideand oxygen between night andday it depends on how you look at the sampleregion. You can consideranything from the block you live on to the entireEarth. If you onlyconsider your block during the day, large amountsof carbon dioxide areproduced from higher activity levels with humans,animals, and driving ofvehicles. Additionally at this time, any livingplants are producing highamounts of oxygen. At night, plants take in carbondioxide reducing it'slevels; however, humans and animals are stillproducing it.

One needs to understand that the amount of carbon dioxide released, or oxygen absorbed, by plants at night is negligible.
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  • does photosynthesis occur at night

    it is not produced at night when it is too dark for photosynthesis to happen

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    Do Plants “Exhale” at Night? – Quiet Kinetic

  • Do plants perform photosynthesis at night | scholarly …

    15/01/2018 · no,plants did noty carry photosynthesis at night.

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Photosynthesis doesn’t occur at night.

At night, however, things are different as only carbon dioxide is released in the atmosphere.

It might be because of this, but many people believe that it's not good to keep plants in the bedroom at night.

Why do plants breath oxygen at night

At night, when photosynthesis can’t take place, plants continue to consume oxygen but they don’t release any back into the room. Would that mean that plants really do compete with humans for oxygen?

is formed via glycolysis at night from starch or other ..

Crassulacean acid metabolism (CAM) can be traced from Roman times through persons who noted a morning acid taste of some common house plants. From India in 1815, Benjamin-Heyne described a `daily acid taste cycle' with some succulent garden plants. Recent work has shown that the nocturnally formed acid is decarboxylated during the day to become the CO2 for photosynthesis. Thus, CAM photosynthesis extends over a 24-hour day using several daily interlocking cycles. To understand CAM photosynthesis, several landmark discoveries were made at the following times: daily reciprocal acid and carbohydrate cycles were found during 1870 to 1887; their precise identification, as malic acid and starch, and accurate quantification occurred from 1940 to 1954; diffusive gas resistance methods were introduced in the early 1960s that led to understanding the powerful stomatal control of daily gas exchanges; C4 photosynthesis in two different types of cells was discovered from 1965 to ∼1974 and the resultant information was used to elucidate the day and night portions of CAM photosynthesis in one cell; and exceptionally high internal green tissue CO2 levels, 0.2 to 2.5%, upon the daytime decarboxylation of malic acid, were discovered in 1979. These discoveries then were combined with related information from C3 and C4 photosynthesis, carbon biochemistry, cellular anatomy, and ecological physiology. Therefore by ∼1980, CAM photosynthesis finally was rigorously outlined. In a nutshell, 24-hour CAM occurs by phosphoenol pyruvate (PEP) carboxylase fixing CO2(HCO3 ) over the night to form malic acid that is stored in plant cell vacuoles. While stomata are tightly closed the following day, malic acid is decarboxylated releasing CO2 for C3 photosynthesis via ribulose bisphosphate carboxylase oxygenase (Rubisco). The CO2 acceptor, PEP, is formed via glycolysis at night from starch or other stored carbohydrates and after decarboxylation the three carbons are restored each day. In mid to late afternoon the stomata can open and mostly C3 photosynthesis occurs until darkness. CAM photo-synthesis can be both inducible and constitutive and is known in 33 families with an estimated 15 to 20 000 species. CAM plants express the most plastic and tenacious photosynthesis known in that they can switch photosynthesis pathways and they can live and conduct photosynthesis for years even in the virtual absence of external H2O and CO2, i.e., CAM tenaciously protects its photosynthesis from both H2O and CO2 stresses.

Do all plants emit CO2 at night

At night, plants resort to respiration, wherein they use oxygen to convert sugar into energy.


In case of photosynthesis, carbon dioxide and water react in the presence of light energy derived from sunlight to produce sugar and oxygen.

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