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Stream ecology - Quiz
Contributed by: Fernandes
  • 1. What is stream ecology the scientific study of?
A) The historical development of cities around rivers
B) Marine biology and ocean currents
C) Aquatic species, their interactions, and connections with physical, chemical, and biological processes
D) Only the physical structure of stream networks
  • 2. What do streams display great variability in?
A) Their force
B) Their salinity levels
C) Atmospheric pressure
D) Only their temperature
  • 3. What kind of gradients do streams generate?
A) Fixed geographical boundaries
B) Only temporal gradients in temperature
C) Spatial and temporal gradients in abiotic and biotic activities
D) Purely chemical gradients in stagnant water
  • 4. How do headwater systems behave compared to mid-lower order systems?
A) Identically
B) With more pollution
C) Without any biological activity
D) Differently
  • 5. Which of the following is a key factor in the physical structure of stream networks?
A) Solar radiation
B) Wind speed
C) Mean annual discharge
D) Human population density
  • 6. Which factor affects the physical structure of stream networks alongside mean annual discharge?
A) Channel size
B) Soil pH
C) Tidal forces
D) Cloud cover
  • 7. What is another key factor determining the physical structure of stream networks?
A) Ocean depth
B) Atmospheric humidity
C) Lava flow
D) Alluvial habitat
  • 8. Along with channel size and discharge, what else is a key factor in stream network physical structure?
A) Contributing area
B) Global warming
C) Lunar cycles
D) Magnetic fields
  • 9. How were streams, lakes, rivers, and wetlands within protected areas previously viewed?
A) As man-made structures
B) As the primary research focus
C) As dangerous obstacles
D) As an afterthought
  • 10. What connects freshwater aquatic ecosystems such as streams?
A) Flowing water
B) Wind patterns
C) Human infrastructure
D) Underground tunnels
  • 11. How does water connecting freshwater ecosystems change?
A) On a spatial and temporal scale
B) Only seasonally
C) Randomly without pattern
D) Never
  • 12. Why were early settlements and cities developed around streams?
A) They provide services like transportation, commerce, and water supply
B) They prevented all natural disasters
C) They were completely dry
D) They provided barriers against enemies
  • 13. What has there been a shift in regarding stream ecosystem research?
A) From biophysical structure to functional properties
B) From living organisms to dead matter
C) From functional properties to static maps
D) From chemical analysis to purely visual observation
  • 14. Where do streams carry sediments and nutrients?
A) Only into underground aquifers
B) Back into headwater springs
C) Into rivers, lakes, and subsequently into oceans
D) Strictly into mountain peaks
  • 15. What is the first primary function of streams?
A) Creating ocean tides
B) Filtering all pollution from the atmosphere
C) Transporting water from higher elevations to lower elevations
D) Generating electricity for cities
  • 16. What is the second primary function of streams?
A) To breed land mammals
B) To transport sediment
C) To block fish migration
D) To increase air temperature
  • 17. What characterizes a healthy stream in terms of sediment?
A) Zero sediment movement
B) An equal amount of sediment being picked up and deposited
C) Continuous accumulation of mud
D) Total erosion of the riverbed
  • 18. What can excess deposition in a stream lead to?
A) Increased fish populations
B) Higher water purity
C) Mid-channel sediment bars
D) Rapid deepening of the channel
  • 19. What can excess channel erosion result in?
A) Formation of stable sediment bars
B) Rapid deepening or widening of the stream channel
C) Absolute stillness
D) Decreased water flow
  • 20. What do streams provide to organisms like horses?
A) Shelter in trees
B) Drinking water
C) Sunlight protection
D) Nesting material
  • 21. What do fish depend on streams for?
A) Aviation
B) Oxygen from the air
C) Habitat
D) Dry land
  • 22. Why can stream ecosystems not be studied?
A) In a laboratory
B) Without computers
C) In isolation
D) During winter
  • 23. Why are streams dynamic and productive of energy?
A) Because of geothermal activity
B) Due to constant wind gusts
C) Due to their movement of water and sediment through a stream system
D) Because they contain heavy metals
  • 24. What happens as a stream flows faster?
A) It loses all erosive power
B) It deposits all sediment immediately
C) It has greater power to erode and carry sediment
D) It freezes instantly
  • 25. How can a stream dissipate the energy of flowing water?
A) By flowing in a straight line forever
B) By altering their flow pattern or meandering
C) By reversing its direction uphill
D) By drying up completely
  • 26. What do streams form as they meander?
A) Underground caves
B) Curves along the distance the flow travels
C) Frozen waterfalls
D) Perfect geometric squares
  • 27. What is normal for stream channels over time?
A) To vanish overnight
B) To move slowly
C) To turn into solid rock
D) To remain completely motionless
  • 28. What kind of plants are found in riparian zones along the stream channel?
A) Shallow-rooted dry weeds
B) Parasitic fungi
C) Desert cacti and succulents
D) Deep or densely rooted, water-loving plants
  • 29. What do plants in the riparian zone add to the stream channel?
A) Toxic chemical pollutants
B) Structural instability
C) Excess sediment deposition
D) Another layer of protection to this energy
  • 30. What represents the trophic foundation of stream ecosystems?
A) Aquatic insects
B) Riparian vegetation
C) Microbial communities
D) Fish populations
  • 31. What is the area alongside a stream covered in vegetation called?
A) The trophic foundation
B) The urban zone
C) The catchment area
D) The riparian zone
  • 32. What determines the type of vegetation that thrives in the riparian zone?
A) Chemical contaminant mixtures
B) Microbial decomposition rates
C) Geologic location
D) Urban infrastructure demand
  • 33. Over how many years has the field of urban stream ecology evolved rapidly?
A) Ten years
B) A hundred years
C) Fifty years
D) Thirty years
  • 34. What do urban areas replace natural landscapes with?
A) Riparian vegetation
B) Organic materials
C) Nutrient-rich soil
D) Impermeable surfaces
  • 35. What is an example of an impermeable surface mentioned in the text?
A) Catchment land cover
B) Stream channels
C) Vegetation
D) Roads
  • 36. What rises as urbanization spreads to rural areas and people leave inner cities?
A) Stream discharge
B) Natural ecosystem functions
C) Infrastructure demand
D) Microbial diversity
  • 37. Which of the following is a process that contributes to nitrogen and phosphorus removal in streams?
A) Denitrification
B) Photosynthesis
C) Evaporation
D) Salinization
  • 38. Which biogeochemical process works to remove nutrients alongside denitrification and assimilation?
A) Condensation
B) Transpiration
C) Nitrification
D) Precipitation
  • 39. What is a growing threat to urban streams and watersheds according to the text?
A) Freshwater salinization
B) Low sunlight
C) Excess oxygen
D) Decreased temperature
  • 40. What is a major driver in the mobilization of salts, nutrients, and metals?
A) Anthropogenic factors
B) Solar radiation
C) Volcanic activity
D) Tectonic plate movement
  • 41. Which of the following is an anthropogenic factor mentioned that drives salinization?
A) Forest canopies
B) Wildlife migration
C) Natural rainfall
D) Road salting
  • 42. What infrastructure contributes to the mobilization of salts and metals in watersheds?
A) Fish ladders
B) Sewage systems
C) Riparian buffers
D) Natural wetlands
  • 43. Excess nitrogen and phosphorus from human activities have caused which of the following water quality concerns?
A) Hypoxia
B) Increased water clarity
C) Low nutrient levels
D) High salinity
  • 44. What water quality issue is linked to excess nutrients in streams and rivers?
A) Desertification
B) Saline crusting
C) Freezing temperatures
D) Algal blooms
  • 45. What water concern is associated with drinking water due to nutrient pollution?
A) Purification
B) Mineralization
C) Desalination
D) Contamination
  • 46. Where does floodplain reconnection work best?
A) Dry desert environments
B) Deep underground caves
C) High-altitude glaciers
D) Locations where excess stormwater can be temporarily stored
  • 47. What is a limitation that may cause floodplain reconnection to deteriorate over time?
A) Erosion
B) Increased fish populations
C) Plant overgrowth
D) Excessive sunlight
  • 48. Streambed reconnection works best when there is a need to do what?
A) Decrease water interaction
B) Remove all sediments permanently
C) Increase nutrient processing
D) Speed up water flow
  • 49. Which biological or chemical uptake process is common in stream ecosystems?
A) Condensation
B) Assimilation
C) Sublimation
D) Radiation
  • 50. Which surface-binding process is mentioned as common in stream ecosystems?
A) Evaporation
B) Adsorption
C) Dissolution
D) Absorption
  • 51. What is one way to increase a stream's surface area by changing its morphology?
A) Straightening the channel
B) Adding meanders
C) Removing all water
D) Paving the streambed
  • 52. Why are wetlands a focus for increasing surface area approaches?
A) Wetlands speed up floodwaters
B) Wetlands destroy stream health
C) Wetlands are highly effective at retaining nutrients
D) Wetlands repel all nutrients
  • 53. Apart from filtering nutrients, what else can wetlands do?
A) Remove all water from the basin
B) Store floodwaters
C) Accelerate flash floods
D) Increase stormwater velocity
  • 54. Which morphological feature is mentioned alongside meanders and step pools in the text?
A) Waterfalls
B) Oxbows
C) Reservoirs
D) Dams
  • 55. Which approach is noted as being similar to the increasing stream surface area approach?
A) The streambed reconnection approach
B) The channel straightening approach
C) The wetland elimination approach
D) The stormwater management approach
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