NITROGENCYCLE

http://www.animationlibrary.com/search/?keywords=recycle

ENERGY & MATTEREnergy is not the only thingthat moves through the ecosystem.

Atoms are never destroyed . . . only transformed.

http://mff.dsisd.net/Environment/Cycles.htm

Take a deep breath.The atoms you just inhaled may have been inhaled by a dinosaur millions of years ago.

http://educ.queensu.ca/~fmc/august2004/pages/dinobreath.html

6 ATOMS make up 95% of the body in most organisms

CARBON

HYDROGEN

OXYGEN

NITROGEN

The same molecules are passed around again and again within the biosphere in____________________ cyclesBIOGEOCHEMICAL

PHOSPHORUS

SULFUR

N2 in Atmosphere

ammonia

Nitrates& nitrites

Section 3-3

NITROGEN CYCLE

BIOLOGY; Miller and Levine; Prentice Hall; 2006

WHY IS NITROGEN IMPORTANT?

Image by Riedell

__________________make DNA and RNA

Adenine (nitrogen base) is used in _______

Makes AMINO part of ____________

(proteins)

Image by Riedell

http://web.jjay.cuny.edu/~acarpi/NSC/12-dna.htm

NITROGEN BASES

ATP

amino acids

79% of the atmosphere is made up of NITROGEN gas (N2)

Image by Riedell Image by Riedell

http://web.jjay.cuny.edu/~acarpi/NSC/12-dna.htm

BUT we _____ use the nitrogen gas we breathe!

The bond in N2 gas is sostrong it can only be broken by__________________________________________________

CAN’T

lightningVolcanic activityfew special bacteria

http://www.slic2.wsu.edu:82/hurlbert/micro101/images/101nodules21.gif

Bacteria that live ______________and in _________ relationships withplants called _________, take nitrogen from the atmosphere and turn it into ______________, a form that is usable by plants.

THIS PROCESSIS CALLED_________________

in the soil

symbiotic

legumes

AMMONIA

NITROGEN FIXATION

Image from: http://www.utdallas.edu/images/departments/biology/misc/gonzalez-image.jpg and http://www.cibike.org/CartoonEating.gif modified by Riedell

Other bacteria in the soil convertammonia into ____________& _______________which plants can also use. The nitrogen we need for proteins, ATP, and nucleic acids comes from

the _____ we eat ____ the____ we breathe!

NITRATES

FOOD

NOT AIR

NITRITES

Bacteria that live ______________also carry out the reverse process

________________ → ___________________.

THIS PROCESSIS CALLED_________________

in the soil

NITRATES & NITRITES

NITROGEN GAS

DENITRIFICATION

REVIEW => NITROGEN CYCLE

Why can’t we use the N in the atmosphere?

In what forms do plants absorb Nitrogen?

Name the processes by which N gas is converted into usable forms of nitrogen.

Why is nitrogen important to living organisms?

What is it and how does it work?

The Water Cycle

The Water Cycle

Condensation

Water Vapor

Precipitation

Evaporation

Transpiration

Water CycleWater never leaves the

Earth. It is constantly being cycled through the atmosphere, ocean, and land. This process, known as the water cycle is driven by energy from the sun. The water cycle is crucial to the existence of life on our planet.

WaterThe water cycle begins

with water. Water is found in many places. A few of them are as follows:

Lakes, rivers, oceans, ponds, puddles, reservoirs, and many other places.

EvaporationThe next stage is

evaporation. This is a process where the water is heated and turned into a water vapor.

The sun is the main heat source for this process.

Condensation The next stage is

condensation. This is where warm and cold air collide and form ice crystals that condense and form droplets of water. These water droplets eventually become to heavy and begin to fall in the form of precipitation.

Precipitation The next stage is

Precipitation. This is water falling to the earth in the form of snow, hail, rain, or sleet.

CollectionDuring collection

water that falls as precipitation essentially collects as surface water (water you can see above ground) or as ground water (water that collects beneath earth’s surface).

TranspirationThe process of

evaporation from plants is called transpiration. (In other words, it’s like plants sweating.)

Evaporation

Evaporation

Condensation

Condensation

Condensation

Precipitation

Collection/Percolation

Collected Water

Collection/Percolation

Surface Water

Review => Water Cycle

Which 2 processes put water into the atmosphere?

How does water return to the earth? In what forms?

Where are some of the places that water collects on/in the earth?

What is transpiration?

Where does transpiration occur?