bio 1m03 exam (ecology
section) QUESTIONS AND
VERIFIED CORRECT
ANSWERS GRADED A+
LATEST 100% GUARANTEED
PASS
5 zones of water depth - CORRECT ANSWER-- Littoral (top, right beside the shore)
- Limnetic (top, farther from the shore)
- Benthic (floor)
- Photic (light)
- Aphotic (no light)
Properties of water - CORRECT ANSWER-- Most dense at 4°C
- It expands as a solid
- Ice floats
- Warmer water holds less O2
- Solubility of O2 and CO2 in water declines with higher temperatures (fish kills in the summer)
,Thermal stratification (layers do not mix) - CORRECT ANSWER-- Epilimnion (warm, less dense,
lots of oxygen)
- Metalimnion (thermocline, rapidly cold)
- Hypolimnion (cold, always at risk of running out of oxygen)
Turnover - CORRECT ANSWER-seasonal mixing
Dimictic - CORRECT ANSWER-mix twice (ex. Ontario)
- Winter and summer stratification
- Spring and fall turnover
Monomictic - CORRECT ANSWER-mix once (ex. Arctic regions during the summer, or warm
monomictic for lakes that never get cold enough)
Meromictic - CORRECT ANSWER-stable stratification, rarely mixes (ex. Lake Nyos, Cameroon
(mixed once and killed a bunch of people because it produced a CO2 cloud)
Trophic status - CORRECT ANSWER-The amount of nutrients, plants and animals produced in a
lake
NPK - CORRECT ANSWER-Nitrogen, phosphorus, potassium
Oligotrophic lakes - CORRECT ANSWER-few nutrient, clear, cold
Mesotrophic lakes - CORRECT ANSWER-intermediate amount of nutrients
Eutrophic lakes - CORRECT ANSWER-many nutrients, high productivity
, Eutrophication - CORRECT ANSWER-nutrient enrichment of a lake (a very big problem because
algae begin to grow (algal bloom) there and produce waste, smells bad and kills fish)
Phosphorus is a... - CORRECT ANSWER-limiting nutrient
(People conduct "bottle experiments",
the double basin lake experiment)
Ocean upwellings - CORRECT ANSWER-Currents in water can transport nutrients, bring
nutrients to the surface
Types of aquatic habitats - CORRECT ANSWER-- Water surface
- Wetlands
- Streams
- Estuaries
- Oceans
Water surface - CORRECT ANSWER-Surface tension - a water habitat created from interacting
intermolecular forces between H2O molecules
Wetlands - CORRECT ANSWER-shallow water habitats (ex. bogs, marshes, swamps)
Streams - CORRECT ANSWER-fast water, shallow, nutrient poor, high o2 and cold at the source
(1st order)
Estuaries - CORRECT ANSWER-areas where a river meets the ocean, causing a gradient (salt
water sinks to the bottom)
section) QUESTIONS AND
VERIFIED CORRECT
ANSWERS GRADED A+
LATEST 100% GUARANTEED
PASS
5 zones of water depth - CORRECT ANSWER-- Littoral (top, right beside the shore)
- Limnetic (top, farther from the shore)
- Benthic (floor)
- Photic (light)
- Aphotic (no light)
Properties of water - CORRECT ANSWER-- Most dense at 4°C
- It expands as a solid
- Ice floats
- Warmer water holds less O2
- Solubility of O2 and CO2 in water declines with higher temperatures (fish kills in the summer)
,Thermal stratification (layers do not mix) - CORRECT ANSWER-- Epilimnion (warm, less dense,
lots of oxygen)
- Metalimnion (thermocline, rapidly cold)
- Hypolimnion (cold, always at risk of running out of oxygen)
Turnover - CORRECT ANSWER-seasonal mixing
Dimictic - CORRECT ANSWER-mix twice (ex. Ontario)
- Winter and summer stratification
- Spring and fall turnover
Monomictic - CORRECT ANSWER-mix once (ex. Arctic regions during the summer, or warm
monomictic for lakes that never get cold enough)
Meromictic - CORRECT ANSWER-stable stratification, rarely mixes (ex. Lake Nyos, Cameroon
(mixed once and killed a bunch of people because it produced a CO2 cloud)
Trophic status - CORRECT ANSWER-The amount of nutrients, plants and animals produced in a
lake
NPK - CORRECT ANSWER-Nitrogen, phosphorus, potassium
Oligotrophic lakes - CORRECT ANSWER-few nutrient, clear, cold
Mesotrophic lakes - CORRECT ANSWER-intermediate amount of nutrients
Eutrophic lakes - CORRECT ANSWER-many nutrients, high productivity
, Eutrophication - CORRECT ANSWER-nutrient enrichment of a lake (a very big problem because
algae begin to grow (algal bloom) there and produce waste, smells bad and kills fish)
Phosphorus is a... - CORRECT ANSWER-limiting nutrient
(People conduct "bottle experiments",
the double basin lake experiment)
Ocean upwellings - CORRECT ANSWER-Currents in water can transport nutrients, bring
nutrients to the surface
Types of aquatic habitats - CORRECT ANSWER-- Water surface
- Wetlands
- Streams
- Estuaries
- Oceans
Water surface - CORRECT ANSWER-Surface tension - a water habitat created from interacting
intermolecular forces between H2O molecules
Wetlands - CORRECT ANSWER-shallow water habitats (ex. bogs, marshes, swamps)
Streams - CORRECT ANSWER-fast water, shallow, nutrient poor, high o2 and cold at the source
(1st order)
Estuaries - CORRECT ANSWER-areas where a river meets the ocean, causing a gradient (salt
water sinks to the bottom)
