Biology 12

THINKING LAB Shrinking Polar Bears and Expanding Snow Geese Background An incredible variety of living things inhabits the biosp ...

442 MHR • Unit 5 Population Dynamics Food Chains and Webs The trophic structure determines the route taken by the energy and mat ...

Chapter 13 Ecological Principles • MHR 443 SECTION REVIEW Explain why some ecosystems can support highly complex food webs whil ...

13.3 Energy Flow in Ecosystems 444 MHR • Unit 5 Population Dynamics All organisms require energy for growth, body maintenance (s ...

Chapter 13 Ecological Principles • MHR 445 Primary Productivity Primary productivityis the amount of light energy that autotroph ...

446 MHR • Unit 5 Population Dynamics be available to the secondary consumers that eat caterpillars. Approximately one third of t ...

MINI LAB Where Do You Fit in the Food Chain? How might your knowledge of pyramids of productivity influence your decision about ...

448 MHR • Unit 5 Population Dynamics occurs because the phytoplankton are eaten so quickly that there is no time for a large pop ...

THINKING LAB Biological Magnification Background Certain toxic compounds are not easily broken down by decomposers, so they rema ...

450 MHR • Unit 5 Population Dynamics SECTION REVIEW Explain why the primary productivity of a grassland usually exceeds the pri ...

Chapter 13 Ecological Principles • MHR 451 13.4 Nutrient Cycling in Ecosystems In addition to energy, organisms must also obtain ...

452 MHR • Unit 5 Population Dynamics solar energy transport over the land precipitation over the land (95) percolation in soil r ...

Chapter 13 Ecological Principles • MHR 453 The Carbon Cycle Another important biogeochemical cycle is the carbon cycle (shown in ...

nitrogen-fixing bacteria in root nodules of legumes nitrogen-fixing soil bacteria ammonification nitrification assimilation nitr ...

Chapter 13 Ecological Principles • MHR 455 The Impact of Humans on Biogeochemical Cycles: A First Look Could the destruction of ...

456 MHR • Unit 5 Population Dynamics In 1966, one of the valleys in the forest area was logged (as in Figure 13.30B). All the tr ...

Chapter 13 Ecological Principles • MHR 457 Biology At Work Ecological Policy Maker “Aboriginal wisdom teaches that all species s ...

SKILL FOCUS Initiating and planning Hypothesizing Identifying variables Performing and recording Analyzing and interpreting Inve ...

Chapter 13 Ecological Principles • MHR 459 7.Devise a sampling procedure (be sure to include sample size, procedure, timetable a ...

460 MHR • Unit 5 Population Dynamics SECTION REVIEW Describe the similarities and differences you would expect to see between b ...