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Presentation on theme: "NITROGEN CYCLE"— Presentation transcript:


2 ENERGY & MATTER Energy is not the only thing that moves through the ecosystem. Atoms are never destroyed... only transformed. Take a deep breath. The atoms you just inhaled may have been inhaled by a dinosaur millions of years ago.

3 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 ____________________ cycles BIOGEOCHEMICAL PHOSPHORUS SULFUR

4 N 2 in Atmosphere ammonia Nitrates & nitrites Section 3-3 NITROGEN CYCLE BIOLOGY; Miller and Levine; Prentice Hall; 2006

5 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 NITROGEN BASES ATP amino acids

6 79% of the atmosphere is made up of NITROGEN gas (N 2 ) Image by Riedell BUT we _____ use the nitrogen gas we breathe! The bond in N 2 gas is so strong it can only be broken by _______________ ____________________ CAN’T lightning Volcanic activity few special bacteria

7 Bacteria that live ______________ and in _________ relationships with plants called _________, take nitrogen from the atmosphere and turn it into ______________, a form that is usable by plants. THIS PROCESS IS CALLED _________________ in the soil symbiotic legumes AMMONIA NITROGEN FIXATION

8 Image from: and modified by Riedell Other bacteria in the soil convert ammonia 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

9 Bacteria that live ______________ also carry out the reverse process ________________ → ___________________. THIS PROCESS IS CALLED _________________ in the soil NITRATES & NITRITESNITROGEN GAS DENITRIFICATION

10 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?

11 What is it and how does it work? The Water Cycle

12 Condensation Water Vapor Precipitation Evaporation Transpiration

13 Water Cycle Water 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.

14 Water The 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.

15 Evaporation The 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.

16 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.

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

18 Collection During 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).

19 Transpiration The process of evaporation from plants is called transpiration. (In other words, it’s like plants sweating.)

20 Evaporation


22 Condensation



25 Precipitation

26 Collection/Percolation Collected Water

27 Collection/Percolation Surface Water

28 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?

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