7 Unit II Nutrients Fall 2014 moodle - Unit II TOPIC 1...

This preview shows page 1 - 11 out of 37 pages.

We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
Biology: The Dynamic Science
The document you are viewing contains questions related to this textbook.
Chapter 51 / Exercise 51.24
Biology: The Dynamic Science
Hertz/Russell
Expert Verified
Unit IITOPIC 1. NUTRIENTSvLife requires energy and nutrients- Chapter 19: p. 410-413; 417-428Table 19.1, Fig. 19.10, Fig. 19.15, Fig. 19.16, Fig. 19.17, Fig. 19.19- Chapter 21: p. 452-462; 466-470Table 21.1, Table 21.2, Table 23.3, Fig. 21.4, Fig. 21.5, Fig. 21.6, Fig. 21.7, Fig. 21.10, Fig. 21.15, Fig 21.17- Chapter 24: p. 525-532;Fig. 24.3, Fig. 24.5, Fig. 24.7, Fig. 24.8, Fig. 24.9, Fig. 24.10
We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
Biology: The Dynamic Science
The document you are viewing contains questions related to this textbook.
Chapter 51 / Exercise 51.24
Biology: The Dynamic Science
Hertz/Russell
Expert Verified
NUTRIENT CYCLESvConnectivity between terrestrial biomes and aquatic ecosystems
vLife requires energy and nutrientsØEnergy captured by biota by - photosynthesis (CO2 fixation)- chemosynthesis (methane, sulfides)ØAll organisms require specific nutrients and chemical elements (e.g. minerals, trace elements) for metabolism and growth; these must be acquired from the environment or from their food.
Nutrient CyclesNutrient cycling– the movement of nutrients within ecosystems, as they undergo biological, chemical, and physical transformations.Environmental compartments may act as “sinks” and / or “sources”
DecompositionDecomposition of organic matter releases nutrients back into the ecosystem.
Excess CO2 and Aquatic SystemsWhy does it matter?
Global Sulfur CyclesMost gaseous S compounds in the atmosphere undergo transformation to SO42– and H2SO4 .Anthropogenic emissions have quadrupled since the Industrial Revolution. Most come from burning S-containing coal and oil.
Nitrogen CyclingNitrogen FixationConverts N2 into biologically available forms Nitrification Converts NH3 and NH4+ into Nitrate (NO3-); aerobic processDenitrificationConverts nitrate to N2 and N2O (nitrous oxide);anaerobic process
Global Nitrogen CyclesMost N in the atmosphere is N2, which is not available to most organisms.N2 fixation is critical for bioavailability(microbes use an enzyme known asnitrogenase)N is a constituent of amino acids and proteins (and enzymes).
Nitrogen CyclingInternal Cycling in PlantsEx.

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture