Exam (elaborations)
Final exam Environmental science ( part 5_ Water cycle) (1)
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- Biochemistry Module 3
- Institution
- Biochemistry Module 3
Final exam Environmental science ( part 5_ Water cycle) (1)
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Final exam Environmental science ( part5/ Water cycle)
Describe the water cycle. Be able to identify and explain the 7 components of the
water cycle. You should also include a diagram - CORRECT
ANSWER-Condensation: molecules entering the atmosphere collected as water
droplets. Vapor to liquid
Precipitation: water moves from the atmosphere to the Earth's surface
Transpiration: water moves from plants into the atmosphere
Evaporation: water moves from the Earth's surface to the atmosphere. Liquid to
vapor
Percolation: movement of water through various layers of the Earth
Ground water: water collects in underground areas coming back to the surface
Surface runoff: collection and movement of water back into larger bodies of water
Explain how water is such a critical component of life on earth - CORRECT
ANSWER-water provides a medium in which all life sustaining chemical reactions
take place
List 5 biotic and 5 abiotic factors in an aquatic ecosystem - CORRECT
ANSWER-biotic: plankton, fish, plants, corals, fitoplankton
abiotic: water, rocks, sunlight, temperature, salinity
What is aeration? - CORRECT ANSWER-process of increasing oxygen level in the
water
Describe the 3 methods of water aeration - CORRECT ANSWER-Waves: water
moves creating a good absorption
Riffles: water flows faster than usual creating a high and better absorption of oxygen
Photosynthesis: underwater plants release oxygen
How are dissolved oxygen and temperature related? - CORRECT ANSWER-As
temperatures increases oxygen decreases
What are the 3 trophic classifications of lakes ? How are they different? - CORRECT
ANSWER-Oligotrophic: low primary productivity, very clear water
Mesotrophic: intermediate level of productivity, beds of underwater plants
Eutotrophic: high productivity, dark water and underwater plants
What is cultural eutrophication? List at east 3 thing that humans do that cause
cultural eutrophication - CORRECT ANSWER-The process when the eutrophication
is accelerated because of humans activities.
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