Question

how to refute the statement "photo synthesis occurs only during the day time"

Answer 1

Hello @manjulapatipaati !

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Answer 2

Photosynthesis occurs only during day time !

Answer 3

I need to refute that statement and prepare an argument for that statment

Answer 4

Please can anyone help me with this ?

Answer 5

See part of photo synthesis can occur at night in certain plants...though they require to absorb light at day first

Answer 6

like plants at dessert?

Answer 7

yes...they are called CAM plants or Crassulacean acid metabolism plants

Answer 8

chk the following link for more detail
https://en.wikipedia.org/wiki/Crassulacean_acid_metabolism#During_the_night

Answer 9

How can put these facts as an argument

Answer 10

Thanq so much for the link Abhisar

Answer 11

\(\Huge\text{Anytime !}\)

Answer 12

Just for clarification why this would be useful @abhisar @manjulapatipaati :

First of all, our 'normal' C3 plants fixate CO2 directly into a chemical compound, which is cut in half a yields two C3 bodies (three carbon atoms). This not only requires the stomata to be open all day (thus making the plant susceptible to drying out because water evaporates all the time), it also requires a very complex enzyme (RuBisCO) manufacturing the process. This Enzyme is so big that it can actually be seen with a light microscope if you're lucky! It is inhibited by Oxygen, though, so if you're on full throttle photosynthesis, this will be a limiting factor.

The third thing I want to say is that the CO2 always has to diffuse into the RuBisCO (yes, it really has airpipe-like structures!), which is another bottleneck in this reaction.

Now, in C4 plants (CO2 is fixated into oxaloacetate (4 carbons) using not RuBisCO but the PEP carboxylase) there is no such thing as a bottle neck under normal conditions, even if the sun is shining really bright. Pyruvate concentrations can be very high inside the cell, the enzyme doesn't care about O2 and is not complex at all. These plants are actually way more effective in stronger sunlight, which is exactly where they grow! But here we have photosynthesis separated from CO2 fixation by space.

Now, in CAM plants, we have the same reactions as in C4 plants. Difference: stomata are opened at night, because it's too risky to open them in daytime, as it is too hot and the plant would dry out in a matter of hours. This also implicates that CAM plants can only grow little by little every day, depending on their oxaloacetate capacities! And since the CO2 fixation part also belongs to photosynthesis, we interpret this as photosynthesis at night, although it technically requires no light to do it.

I want you to understand that plants face very different difficulties in manufacturing the photosynthesis process, depending on their habitat. Some divide fixation and photosynthesis by space (C4), some by time (CAM). So all these different methods are really just survival adaptations.

Answer 13

I posted it additionally, because it is not made clear in the wikipedia article imo.

Answer 14

ohhh...\(\Huge\text{Thank you !}\) for sharing that

Answer 15

I see u hav given a elaborative and easy to understand description !

Answer 16

@manjulapatipaati Hope, if U Are Satisfied with this answer, Please Close This Question !

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