Unit 5: Emerging Environmental Issues - Practice Quiz

1 What is global warming?

2 Which gas is a major contributor to human-caused global warming?

3 Which effect is commonly linked to global warming?

4 What is the greenhouse effect?

5 Where is most atmospheric ozone found?

6 What is the main role of the ozone layer?

7 Which chemicals have been strongly linked to ozone depletion?

8 What is the ozone hole?

9 What is deforestation?

10 Which activity is a common cause of deforestation?

11 Which environmental problem can result from deforestation?

12 How can deforestation affect the carbon cycle?

13 What does food security mean?

14 Which condition can threaten food security?

15 Which factor is important for producing crops?

16 What is one possible effect of climate change on food security?

17 What is biodiversity?

18 Which activity can cause biodiversity loss?

19 What is an endangered species?

20 Why is biodiversity important to ecosystems?

21 A coastal city experiences more frequent tidal flooding even though annual rainfall has not changed significantly. Which effect of global warming most directly explains this pattern?

22 A region replaces native forests with dark asphalt surfaces and records higher daytime temperatures than nearby rural areas. Which process best explains this local warming?

23 Why can the loss of Arctic sea ice accelerate regional warming?

24 Farmers in a semi-arid region face longer droughts and more intense heat waves. Which adaptation would most directly reduce crop losses?

25 Why does stratospheric ozone depletion increase the risk of skin cancer in humans?

26 Chlorofluorocarbons can damage the ozone layer mainly because they:

27 Which observation would provide the strongest evidence that an ozone-reduction policy is working?

28 Why is the Antarctic ozone hole especially severe during the Southern Hemisphere spring?

29 A forested watershed is cleared for agriculture, and downstream flooding becomes more frequent. Which combination best explains this change?

30 Which practice would most effectively reduce soil erosion on a steep deforested hillside?

31 Deforestation can contribute to global warming because it often:

32 A government wants to reduce illegal logging while maintaining rural employment. Which policy is most likely to support both goals?

33 A country has enough food available nationally, but many households cannot afford nutritious meals. Which dimension of food security is most directly lacking?

34 Which farming strategy would best improve food security in an area with unreliable rainfall and declining soil fertility?

35 A prolonged drought reduces cereal production, but food losses remain low because grain storage facilities are improved. Which food-security dimension has been strengthened?

36 Why can dependence on a single crop variety increase the risk of food insecurity?

37 A predator is removed from a grassland, causing herbivore numbers to rise and vegetation cover to decline. This illustrates:

38 Which conservation approach would best protect a species whose population is divided among several isolated forest patches?

39 Why can the introduction of an invasive species reduce native biodiversity?

40 A coastal wetland is destroyed for construction, reducing fish nurseries and weakening storm protection. Which concept best describes these lost benefits?

41 A region experiences warmer winters, earlier snowmelt, and reduced summer river discharge despite receiving nearly unchanged annual precipitation. Which mechanism best explains this pattern?

42 Why can a warming climate intensify both floods and droughts in the same river basin?

43 A melting ice sheet initially contributes to sea-level rise through added water. Which additional process can amplify regional sea-level rise near the ice sheet?

44 Which observation most strongly indicates that recent warming is driven primarily by an enhanced greenhouse effect rather than by increased solar output?

45 A coastal wetland can continue storing carbon during moderate sea-level rise but becomes a net carbon source after prolonged inundation. Which transition best explains this change?

46 Why did chlorofluorocarbons produce delayed ozone depletion even though their emissions occurred mainly near Earth's surface?

47 Why is severe seasonal ozone depletion especially associated with the polar stratosphere rather than with all regions equally?

48 Which statement correctly distinguishes ozone depletion from global warming in terms of atmospheric radiative effects?

49 Suppose a substitute chemical has zero ozone-depletion potential but a very high global-warming potential. Which conclusion is most scientifically defensible?

50 A forest is cleared in a humid tropical watershed, and peak floods become higher while dry-season flows decline. Which combination best explains both changes?

51 Why can deforestation produce a warming feedback even when the cleared land is replanted with a fast-growing plantation?

52 Which policy design is most likely to reduce leakage from a forest-conservation project?

53 A road through intact forest causes little immediate clearing but later produces extensive habitat loss. Which process best represents the main indirect effect?

54 A country has sufficient national grain stocks, but many households cannot afford food after a drought raises prices. Which dimension of food security is most directly failing?

55 A farming system produces high yields but depends on one crop, heavy irrigation, and imported fertilizer. Which assessment is most accurate?

56 Which intervention best addresses the interaction between climate change and food insecurity in a drought-prone smallholder region?

57 A protected area retains many species, but roads divide it into small isolated patches. Which biodiversity effect is most likely over time?

58 Why can the loss of a species with low abundance still cause a disproportionate decline in ecosystem functioning?

59 An island supports several closely related bird species that use different food sources. Introduction of a generalist competitor causes two specialists to disappear. Which concept best explains this result?

60 Which conservation strategy best protects evolutionary potential when a species' habitat is becoming warmer and fragmented?