Respected sir,
I have read in Quora an answer when the earth was formed, the atmosphere had
less oxygen, humans could not have appeared. After growing of trees for
millions of years, the atmosphere became more with oxygen. Then only humans
have appeared since they could breath well and survive.
Regarding animals in earth, we are not sure, on those days before millions of
years, whether they required this much of oxygen to breath and survive.
Gopalakrishnan
On Tuesday, 19 March, 2024 at 11:58:44 pm IST, 'venkat giri' via
KeralaIyers <[email protected]> wrote:
Respected Sir/s,
TREES AND OXYGEN.... TREES HELP US BREATHE
Just like humans, trees breathe. Except instead of breathing in
oxygen as we do, trees pull in carbon dioxide before emitting oxygen.
Trees and rainforests produce about 28 percent of the world’s oxygen with ocean
“plants”, like phytoplankton, producing the rest. Without trees, there would be
less oxygen available to breathe. Just like any
other living organism, trees take in nutrients, water, and sunlight to produce
energy and grow. So, just like humans, trees can breathe, but unlike humans,
it’s not oxygen that trees are pulling in.
TREES actually pull in carbon dioxide before releasing oxygen.
Because trees don’t have lungs, this isn’t a process that can be seen. It
happens at a cellular level, invisible to the human eye, but that doesn’t make
it any less important. In fact, most plants breathe this way. It’s one of the
critical ways they produce atmospheric oxygen and clean the air surrounding us.
HOW DO TREES MAKE OXYGEN?Like so many living things around the world, trees
depend on sunlight to respirate. During the spring and
summertime, the leaves of a tree pull in carbon dioxide, water, and energy from
the sun to turn into sugars that produce nutrients. This process, which is
called photosynthesis, then emits oxygen that helps other living things breathe.
Typically, this process happens the most in spring and
summer –– when trees are most active and dependent on the sun. During the fall,
trees begin preparing for winter, dropping their leaves if they are deciduous
and going into dormancy. When leaves begin losing their vibrant green color,
that’s when photosynthesis begins to slow down. As chlorophyll, the molecule
that produces the green colour of leaves in deciduous trees, it becomes harder
for trees to absorb sunlight and use it to produce energy.
Once winter begins, trees reach a state of dormancy. Similar to
hibernation, dormancy simply means that trees are conserving their energy for
the bracing season ahead. During this time, trees don’t actively
photosynthesize or produce oxygen, causing oxygen levels to fall and carbon
dioxide to rise.
Trees more than make up for the lowered oxygen levels in the spring and
summertime, so humans tend not to be too affected when trees go dormant.
HOW MUCH OXYGEN DOES A TREE PRODUCE?
While most oxygen is produced by phytoplankton, trees still play a
significant role in providing us with breathable and clean air. The average
human takes in about 550 liters of oxygen in a day –– that’s about 145 gallons.
Individuals who exercise or are active throughout the day may take in more
oxygen on average, depending on the level of activity.
Now, some of that oxygen is produced by trees. The amount of oxygen
a tree produces is influenced by several factors, including species, age,
health, and surroundings. A tree also does not produce the same amount of
oxygen year-round. Because oxygen production is dependent on sunlight, trees
also don’t produce the same amount of oxygen during the night.
Typically, old, mature trees produce more oxygen than younger trees. In fact, a
mature oak tree can produce, on average, 100,000 liters of oxygen a year.
That’s about 274 liters of oxygen a day –– nearly half of what the average
human needs in a day. Douglas fir, beech, spruce, and maple trees are among the
trees that produce the most oxygen. In other words, in addition to the many
other vital roles that healthy forests play, it’s in our best interest to be
vastly outnumbered by trees.
THE GREATEST PRICE WE NEVER, NEVER THINK OF PAYING BACK!
In one day a human being breathes oxygen equivalent to three cylinders.Each
oxygen cylinder costs Rs 700, without subsidy.
So in a day one uses Oxygen worth Rs 2100 and for a full year it is Rs 7,66,500.
If we consider an average life span of 65 years; he cost of oxygen we use
becomes a staggering sum of Rs 500,00,000.( Rs 5Crore ). All this oxygen is
derived free from the trees..
Very few people look at trees as a resource
and there is rampart tree cutting which should STOP.
----RegardsV.SridharanTrichy
courtesy:G.Balasubramanian' [email protected]
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