Download Oxygen Cycle

Name: Priyanshi Class: 9B
Plants "breathe" in carbon dioxide and "breathe" out
oxygen. Animals form the other half of the oxygen cycle. We
breathe in oxygen which we use to break carbohydrates down into
energy in a process called respiration. Carbon dioxide produced
during respiration is breathed out by animals into the air.
So oxygen is created in plants and used up by animals
But the oxygen cycle is not actually quite that simple. Plants must
break carbohydrates down into energy just as animals do. During
the day, plants hold onto a bit of the oxygen which they produced in
photosynthesis and use that oxygen to break down carbohydrates.
But in order to maintain their metabolism and continue respiration at
night, the plants must absorb oxygen from the air and give off carbon
dioxide just as animals do.
Name: Vanshika Goel Class:9B Roll no.18
Name: Vanshika Goel Class:9B Roll no.18
Name: Rashita Class:9B
Oxygen uptake rate (O.U.R.) is the rate at which oxygen is
consumed by living organisms in the. Since organisms are
constantly using up oxygen in the and oxygen is constantly reentering the atmosphere through photosynthesis. In a healthy
ecosystem, the rates of oxygen transfer (being used up) and
oxygen uptake are balanced in the water.
Name: Saksham Setia Class: 9B Roll no. 17
Maintaining the oxygen cycle
The forests are called the lungs of the earth. The forests put oxygen
into the air and remove carbon dioxide. However, logging and clearing
of forests for agricultural purposes is having a serious impact on the
world's forests. Disrupting the forests adds carbon back to the
environment. A healthy atmosphere, according to the National Oceanic
and Atmospheric Administration (NOAA) is one in which the "amount
of carbon dioxide used by plants equals the amount returned to the
atmosphere by respiration, decay and other natural processes". But,
NOAA cautions, the destruction of large tracts of forests is adding
excessive amounts of carbon dioxide to the atmosphere. The balance
is being destroyed. Also use of fossil fuels on a large scale adds to the
amount of carbon dioxide in the atmosphere and leads to disruption of
this natural process.
Riya Garg,28
•Refrain from putting excess carbon dixoide into the atmosphere; ie minimising
the use of fossil fuels like coal
•Plant a tree. A single tree can absorb one ton of carbon dioxide over its lifetime..
•Change a light. Replacing a regular light bulb with a compact fluorescent one
saves 150 pounds of carbon dioxide each year
•Recycle more and buy recycled. Save up to 2,400 pounds of carbon dioxide
each year just by recycling half your household waste. By recycling and buying
products with recycled content you also save energy, resources and landfill
space!
Riya Garg,28