 Carbon is the basis for life on Earth.  99.9% of all organisms on the planet to carbon based life.  This means that all of those organisms require.

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Presentation transcript:

 Carbon is the basis for life on Earth.  99.9% of all organisms on the planet to carbon based life.  This means that all of those organisms require carbon to survive

 Is there carbon in sugar?  Is there carbon in CO 2 ?

 The Earth has only a fixed amount of carbon.  Carbon is the ultimate form of recycling.

 How do plants use carbon?  Photosynthesis – ▪ Takes CO 2 from atmosphere and combine with water

 Animals are the non-photosynthetic creature  Cannot create their own food  Break down sugar and starches through a process of metabolism  What does an animal get from metabolizing?  Energy  H2O  CO2  CO 2 goes back to the atmosphere to use again.

 Decomposers are involved in the carbon cycle  Break down organic materials ▪ Dead plants and animals ▪ Feces  Produces gasses ▪ CO2 and Methane

p. 352 Carbon atoms may return to the pool of carbon dioxide in the air and water in three ways. 1. Respiration. 2. Combustion. 3. Erosion.

Step 1  PLANTS USE CARBON FROM THE AIR (CO2) & WATER & ENERGY FROM SUNLIGHT

STEP 2  ANIMALS EAT PLANTS (sugar for energy) & BREATH IN O2 & breath out CARBON DIOXIDE GAS

Step 3  PLANTS USE CARBON DIOXIDE & ANIMALS DIE & DECOMPOSE & nutrients are returned to the soil.

Composition of the Atmosphere The atmosphere is primarily composed of Nitrogen (N 2, 78%) Oxygen (O 2, 21%) Argon (Ar, 1%). A myriad of other very influential components are also present which include water (H 2 O, 0 - 7%), "greenhouse" gases or Ozone (O 3, %) Carbon Dioxide (CO 2, %)

 What is Nitrogen?  An element just like carbon  All creatures need Nitrogen to survive  Where is Nitrogen?  There are huge amounts of Nitrogen in the atmosphere!  Most plants and animals cannot use it.  It must be fixed (put in a biologically useful compound)  After its fixed it can be used.

 Atmosphere  Most abundant N source  Cannot be used by animals and plants  Soil  nitrates in soil can be used by plants  Can be converted into nitrate compounds by bacteria, algae, & evening lighting.  Once in soil nitrogen becomes biologically accessible.

 Plants are the main users of nitrogen in soil.  They take in nitrates through their root systems.  Once in the plant it helps the plant survive.

 Once the plants have converted the nitrogen the element can be returned to the soil or be taken in by animals  Herbivores eat plants and convert many of the amino acids into new proteins  Omnivores eat both plants and animals into new proteins.  The nitrogen compounds are only borrowed

 Nitrogen atoms are returned to the soil in feces and dead animals  Once in the soil the process happens again!

Nitrogen Cycle : Bacteria carry out many of the important steps in the nitrogen cycle, including the conversion of atmospheric nitrogen into a usable form, ammonia. p. 353