MARINE SCIENCE TESTS
How could attraction to predator odour affect a certain species population in the wild? -
Answer -Could decrease population size due to predation of larvae
Discuss the impact of global climate change on wild populations of reef fish. - Answer -
1. Global climate change is enhanced by increased atmospheric CO2.
2. Because CO2 dissolves in seawater, CO2 promotes ocean acidification/lowers pH.
3. At high levels of atmospheric CO2 - certain species are more attracted to predators.
4. Current atmospheric CO2 levels are not high enough to cause fish larvae to be
attracted to predators.
5. CO2 level would need to double current levels to cause fish larvae to be attracted to
predatord in the wild.
6. Other species of fish could also be affected.
7. Increase in water temperature would result in lower CO2 solubility.
Identify:
- First quarter moon
- New moon - Answer -- Neap tide (first quarter moon) smaller.
- Spring tide (new moon) bigger.
Tides and lunar cycle - Answer -- Spring tide (full moon)
- Neap tide (first quarter moon)
- Spring tide (new moon)
- Neap tide (last quarter moon)
(Neap tide smaller)
(Spring tide bigger)
Identify 2 methods for determining the topography of the ocean floor. - Answer -1.
Satellite altimetry
, 2. Seismic profiling or echo-sounding
-Light and imaging technology
-Cameras on remote operated vehicles
Evaluate the merits of methods for determining the topography of the ocean floor. -
Answer -1. ECHO-SOUNDING
-Is direct measurement
-Slower/more expensive to get data than the satellite altimetry.
-Provides data not available from satellites.
2. SATELLITE ALTIMETRY
-Indirect and requires data to be processed
-Data due to other causes to be subtracted.
3. CAMERAS AND REMOTE OPERATED VEHICLES
-Direct data collection
-Slower/more expensive to get data than the satellite altimetry.
Label a:
1. Thermocline
2. Halocline
3. Pycnocline - Answer -1. Thermocline: change in temperature. /
2. Halocline: change in salinity \
3. Pycnocline: change in density \
"Tia tete habla sobre puro daddy"
Determine if a column of water is vertically stable - Answer -- If + dense at the surface it
will be unstable/lead to convection.
- Movement would occur only if more dense water at the surface than at the bottom.
-At the surface water is warmer and less salty (so it is less dense).
-Because water is less dense at the surface, the water will not move/is stable.
Outline the reasons salt dissolves in water. - Answer -1. Water molecule is a polar
molecule.
2. Like compounds dissolve like compounds (with respect to charge or non-charge).
3. Salt forms ions when in water.
4. Ions have charges that attract polar water toward them.
5. Warmer water dissolved salt more easily.
6. Salt is more soluble at higher temperatures.
List abiotic characteristics of hydro-thermal vent ecosystems that set them apart from
other marine ecosystems. - Answer -1. High temperatures
How could attraction to predator odour affect a certain species population in the wild? -
Answer -Could decrease population size due to predation of larvae
Discuss the impact of global climate change on wild populations of reef fish. - Answer -
1. Global climate change is enhanced by increased atmospheric CO2.
2. Because CO2 dissolves in seawater, CO2 promotes ocean acidification/lowers pH.
3. At high levels of atmospheric CO2 - certain species are more attracted to predators.
4. Current atmospheric CO2 levels are not high enough to cause fish larvae to be
attracted to predators.
5. CO2 level would need to double current levels to cause fish larvae to be attracted to
predatord in the wild.
6. Other species of fish could also be affected.
7. Increase in water temperature would result in lower CO2 solubility.
Identify:
- First quarter moon
- New moon - Answer -- Neap tide (first quarter moon) smaller.
- Spring tide (new moon) bigger.
Tides and lunar cycle - Answer -- Spring tide (full moon)
- Neap tide (first quarter moon)
- Spring tide (new moon)
- Neap tide (last quarter moon)
(Neap tide smaller)
(Spring tide bigger)
Identify 2 methods for determining the topography of the ocean floor. - Answer -1.
Satellite altimetry
, 2. Seismic profiling or echo-sounding
-Light and imaging technology
-Cameras on remote operated vehicles
Evaluate the merits of methods for determining the topography of the ocean floor. -
Answer -1. ECHO-SOUNDING
-Is direct measurement
-Slower/more expensive to get data than the satellite altimetry.
-Provides data not available from satellites.
2. SATELLITE ALTIMETRY
-Indirect and requires data to be processed
-Data due to other causes to be subtracted.
3. CAMERAS AND REMOTE OPERATED VEHICLES
-Direct data collection
-Slower/more expensive to get data than the satellite altimetry.
Label a:
1. Thermocline
2. Halocline
3. Pycnocline - Answer -1. Thermocline: change in temperature. /
2. Halocline: change in salinity \
3. Pycnocline: change in density \
"Tia tete habla sobre puro daddy"
Determine if a column of water is vertically stable - Answer -- If + dense at the surface it
will be unstable/lead to convection.
- Movement would occur only if more dense water at the surface than at the bottom.
-At the surface water is warmer and less salty (so it is less dense).
-Because water is less dense at the surface, the water will not move/is stable.
Outline the reasons salt dissolves in water. - Answer -1. Water molecule is a polar
molecule.
2. Like compounds dissolve like compounds (with respect to charge or non-charge).
3. Salt forms ions when in water.
4. Ions have charges that attract polar water toward them.
5. Warmer water dissolved salt more easily.
6. Salt is more soluble at higher temperatures.
List abiotic characteristics of hydro-thermal vent ecosystems that set them apart from
other marine ecosystems. - Answer -1. High temperatures
