This ppt is about carbon cycle and its explanation......

1. The Carbon cycle
Presented By: Latif Mirani
Class BS English 1st
semester(Morning)
BZU

2. Importance of Carbon
Carbon is virtually important molecule in
the carbon cycle.
Proteins, nucleic acids, lipids,
carbohydrates and other molecules
essential to life contain carbon.
Carbon is present in the atmosphere as
the gas carbon dioxide (CO2), which
makes up approximately 0.04% of the
atmosphere.
It is also present in the oceans and fresh
water as dissolved carbon dioxide. Carbon
are also present in rocks such as lime
stone (CaCO3).
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3. What is cycle?
A cycle is a series of events that are regularly
repeated in the same order. It is complete set or
series in any process.
What is Carbon cycle?
The global movement of carbon between biotic and
abiotic environment, including atmosphere and
ocean and organisms is known as carbon cycle. The
same carbon atoms are used repeatedly on earth.
The cycle is between earth and atmosphere.
Carbon cycle occurs in various processes such as
photosynthesis, decomposition, animal and plant
respiration, combustion, partially decomposed
plant remains etc.
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Photosynthesis and Cellular Respiration
• During photosynthesis, plants, algae and
cyanobacteria remove Carbon dioxide from the
atmosphere and fix it into complex organic
compounds such as Glucose.
• The atmospheric carbon is used by consumers in
the form of glucose from plants. The process of
cellular respiration returns Carbon dioxide back to
the atmosphere.
• Thus, photosynthesis removes carbon from abiotic
environment and incorporates it into biological
molecules while Cellular respiration returns carbon
into the abiotic environment.
• A similar carbon cycle occurs in aquatic ecosystem
between aquatic organisms and dissolved CO2 in
water.

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Combustion and Decomposition
• Combustion can be natural or created by humans.
The process of combustion, may return the
carbon in coal, oil, natural gas, and wood to the
atmosphere.
• In combustion, organic molecules are rapidly
oxidized and are converted into carbon dioxide
and water with an accompanying release of light
and heat.
• When plants and animals die, most of their
bodies are decomposed by decomposers such as
bacteria which break complex organic molecules
into simpler ones and carbon atoms are returned
to the atmosphere.
• Some are not fully decomposed and converted
into underground deposits (oil, coal, etc.) which
again take part in carbon cycle.

6. Importance of Carbon cycle
• Many elements have cycle, but the cycling of carbon atoms is
particularly important because it is very important for our
environment.
• Through photosynthesis and respiration, it is the way earth produces
food and other renewable resources.
• Decomposers play a vital role in recycling carbon and other
elements of biological and environmental necessary through the
carbon cycle. They break complex organic compounds into simple
ones to release energy.
• Carbon dioxide plays a key role in trapping heat in the environment-
one of the basic mechanism behind the greenhouse effect.
• Carbon plays a central role in combustion.
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7. Carbon cycle
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8. Human impact on carbon cycle
• Human activity has modified the carbon
cycle by changing its components' functions
and directly adding carbon to the
atmosphere.
• The largest human impact on the carbon
cycle is through direct emissions from
burning fossil fuels, which transfers carbon
from the geosphere into the atmosphere.
• More carbon is moving to the atmosphere
as humans get rid of forests by burning the
trees or by deforestation i.e.; removing
forests by cutting them for human
purposes.
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9. Carbon dioxide and Greenhouse effect
• The carbon cycle plays a key role in
regulating Earth's global temperature
and climate by controlling the amount
of carbon dioxide in the atmosphere.
The greenhouse effect itself is a
naturally occurring phenomenon that
makes Earth warm enough for life to
exist.
• The gradual increase in the overall
temperature of Earth's atmosphere
due to the greenhouse effect.
• Greenhouse effect adds carbon
dioxide into the environment thus,
causes global warming.
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11. Global warming and carbon dioxide
• Increased atmospheric CO2 concentration is widely
being considered as the main driving factor that
causes the phenomenon of global warming.
• The increased volumes of carbon dioxide and other
greenhouse gases released by the burning of fossil
fuels, agriculture, and other human activities, are
believed to be the primary sources of the global
warming.
• Carbon dioxide has a significant impact on global
warming partly because of its abundance in the
atmosphere.
• Changes resulting from global warming may include
rising sea levels due to the melting of the polar ice
caps, as well as an increase in occurrence and severity
of storms and other severe weather events.
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