Refer to the next food web shown. The numbers indicate the concentrations of an organic pesticide measured in parts per million. Ospreys (20 ppm) Mussels (0.5 ppm) Fish (0.4 ppm) Water (0.00002 ppm) Plankton (0.03 ppm) 47. The pesticide concentration in the top trophic level of the food web is how many times greater than the pesticide concentration in the water? A) 1,000,000 D) 60,000 (B) 300,000 (E) 2,000 (C) 100,000 www

Refer to the next food web shown. The numbers indicate the concentrations of an organic pesticide measured in parts per million. Ospreys (20 ppm) Mussels (0.5 ppm) Fish (0.4 ppm) Water (0.00002 ppm) Plankton (0.03 ppm) 47. The pesticide concentration in the top trophic level of the food web is how many times greater than the pesticide concentration in the water? A) 1,000,000 D) 60,000 (B) 300,000 (E) 2,000 (C) 100,000 www

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter18: The Biosphere And Human Effects

Section: Chapter Questions

Problem 4CT

See similar textbooks

Similar questions

In a seagrass ecosystem, nutrients limit primary production under low nutrient (oligotrophic) condition, while light becomes the limiting factor under high nutrient (eutrophic) condition. Discuss how this happens with respect to the three primary producers (seagrass, macroalgae, phytoplankton) as the condition changes from oligotrophic to eutrophic.
Decomposers are associated with which class of food web? a. grazing b. detrital c. inverted d. aquatic
Figure 44.10 How might turnover in tropical lakes differ from turnover in lakes that exist in temperate regions?
Figure 46.8 Why do you think the value for gross productivity of the primary producers is the same as the value for totall heat and respiration (20,810 kcal/ m2/yr)?
SCIENCE, TECHNOLOGY, AND SOCIETY In many countries,irrigation is depleting aquifers to such an extent that landis subsiding, harvests are decreasing, and it is becomingnecessary to drill wells deeper. In many cases, the withdrawalof groundwater has now greatly surpassed the aquifers’ ratesof natural recharge. Discuss the possible consequences of thistrend. What can society and science do to help alleviate thisgrowing problem?
There are two types of nutrient pools, atmospheric-hydrospheric, and sedimentary. How are they different?
In shallow coastal ecosystems dominated by seagrasses, nutrients limit primary production under low nutrient (oligotrophic) condition while light becomes the limiting factor under high nutrient (eutrophic) condition. In the conceptual model given below, identify which group of primary producers (i.e. seagrasses, macroalgae, phytoplankton) corresponds to each of the line graphs by filling in the blank boxes. Explain your answer.
In not more than 200 words or 5 sentences, answer or explain the following situation. In a seagrass ecosystem, nutrients restrict primary production under low nutrient (oligotrophic) conditions, while light becomes the limiting factor under high nutrient (eutrophic) conditions. Discuss how this happens with respect to the three primary producers (seagrass, macroalgae, phytoplankton) as the condition changes from oligotrophic to eutrophic.
What are trophic levels?How many trophic levels can afood chain have?
What happens if there’s a natural disturbance (drought) affecting the balance of the food chain so that the Sun +E can supply only 4 energy units per plant? Compute for energy units following the table above and answer the following questions: What is the effect of reduced energy supply (nutrients or food) to the plants? Which components received comparatively less energy in the disturbed food chain? What could be the consequences of the above? If human beings were the last component in this food chain, what would be the consequences of reduced nutrient supply to plants?
WRITE ABOUT A THEME: Energy and MatterDecomposition typically occurs quickly in moist tropicalforests. However, waterlogging in the soil of some moisttropical forests results over time in a buildup of organicmatter called “peat.” In a short essay (100–150 words), discussthe relationship of net primary production, net ecosystemproduction, and decomposition for such an ecosystem. AreNPP and NEP likely to be positive? What do you think wouldhappen to NEP if a landowner drained the water from atropical peatland, exposing the organic matter to air?
What will be the amount of energy available to the organism of the 2nd trophic level of afood chain, if the energy available at the first trophic level is 10,000 Joules?