photosynthesis?

Question

through the day plants take in co2 and give out o2,is it true this process is reversed at night time, if it is can you tell me why and how, thank you

Answer 1

Photosynthesis always requires that CO2 is taken in and oxygen is always a by-product.

The energy for photosynthesis ultimately comes from absorbed photons and involves a reducing agent, which is water in the case of plants, releasing oxygen as a waste product. The light energy is converted to chemical energy (known as light-dependent reactions), in the form of ATP and NADPH, which is used for synthetic reactions in plants. Most notably plants use the chemical energy to fix carbon dioxide into carbohydrates and other organic compounds. The overall equation for carbon fixation (sometimes referred to as carbon reduction) in green plants is

n CO2 + 2n H2O + ATP + NADPH → (CH2O)n + n H2O + n O2

Photosynthesis is the process by which plants get their sugar and it requires that CO2 be taken in and oxygen (02) is given off.

Plants collect C02 at all times to prevent moisture loss and they emit it at all times, not just at night. During the day the small amount is overwhelmed by the O2 being produced, but its still there.

Answer 2

Plants like all living organisms undergo cellular respiration - O2 is taken in and CO2 given out. This happens all the time, although for purposes of preventing moisture loss many plants accumulate CO2 in their leaves during the day and then release it through stomata at night, so CO2 given off from respiration may increase at night.

In photosynthesis the enzyme RUBISCO splits CO2, capturing the carbon and releasing oxygen. This reaction is light-dependent, so as the light intensity reduces the light-dependent part of photosynthesis diminishes and O2 emission falls with it.

So there is no actual reversal of any processes it is just that there is no release of O2 from photosynthesis at night and CO2 emissions from respiration are lower during the day.

Answer 3

Since photosynthesis is light dependent process, therefore during the day plants usually take CO2 and release O2 as by product. It is mentionworth that CO2 is the most important ingredient for photosynthesis.
As the intensity of light falls during evening hours, the CO2 in take also falls(light compensation point) and finally no intake of CO2 takes place. However, during night the plants take O2 for the process of respiration and give CO2 as waste and by product.
So, the process of photosynthesis during the day is dominated by the process of cellular respiration during the night.

Answer 4

yes it is true that it is reversed at night time because sunlight is essential for the process.at night the plant respires naturally taking ti O2 and letting out CO2.The key factor in photosynthesis is a green pigment called chlorophyll.it gives the plant it's green colour and is essential for photosynthesis.

Answer 5

it is true but partially. at night, the process of photosynthesis in plants stops due to absence of sunlight. however, respiration, in which co2 evolves, continues to take place. hence, there is more production of co2 at night. during day time, the effect of respiration is nullified by photosynthesis in which large quantities of o2 is produced.

Answer 6

I will answer your question with a question do breath in co2 at night? you breath in o2 and out co2 plants do just the opposite

Answer 7

buy yourself an a-level biology textbook and look up photosynthesis!! that will stump you!! in the short and long of it plants carry out 2 reactions: light-dependant [dependant on light] and light-independant reactions [does not rely on light.] so the process isn't reversed as such there are just to reactions occuring in different parts of the plant. =] hope that was easy enough to understand! it's taken me 2 years of studying!

Answer 8

No, it stays the same both day and night.

Answer 9

no it is not reversed as then it wouldnt be photosysthesis it would be something else!