Red wrote:

On Dec 23, 9:13 pm, "SteveB" wrote:


"ecarecar" wrote in message






That is wrong; it is NOT correct.


The oxygen produced in photosynthesis comes from water which is split into
hydrogen and oxygen. (Ref. any college - or probably high school -
biology
book)


Or go to this site on Google and find out how stupid you truly a

http://www.emc.maricopa.edu/faculty/...BioBookPS.html

HTH, but I doubt it.




Not sure from your comment which one of us you think is stupid, but
your link points to ecarecar.

Quoted from your referenced link:

The Carbon Cycle
Plants may be viewed as carbon sinks, removing carbon dioxide FROM THE
ATMOSPHERE and oceans by fixing it into organic chemicals.

two steps in the photosynthesis process:
In the Light Independent Process, carbon dioxide FROM THE ATMOSPHERE
(or water for aquatic/marine organisms) is captured and modified by
the addition of Hydrogen to form carbohydrates

The raw materials of photosynthesis, water and carbon dioxide, enter
the cells of the leaf, and the products of photosynthesis, sugar AND
OXYGEN, leave the leaf.

Carbon dioxide cannot pass through the protective waxy layer covering
the leaf (cuticle), but it can enter the leaf through an opening (the
stoma) flanked by two guard cells. Likewise, OXYGEN PRODUCED BY
PHOTOSYNTHESIS can only pass out of the leaf through the opened
stomata.

Red



The discussion seems to have been edited somewhat. Perhaps some learning
has been imparted. Learning is good.

But, on to the important part of the discussion, clearly, it is ecarecar
who is
the smart one.

As Red has pointed out, carbon dioxide is "captured and modified." The
oxygen
product of photosynthesis does not come from carbon dioxide but, rather,
from
water where hydrogen is separated from oxygen.