Expert Answer:Phytoplankton Provinces & Co2 Science Reflective Q


Solved by verified expert:Your essay answer should be clear and succinct, amounting to perhaps 3-5 sentences totaling 50 to 80 words; longer essays are strongly discouraged. It is recommended that you prepare your answer in a separate document from which you copy it into Canvas.Question 1 5 ptsWhat are the similarities and differences between pelagic and benthic provinces in the oceans and the characteristics of organisms that inhabit these different realms.A strong answer will describe how ocean provinces are defined and specific differences that are used to distinguish them, citing illustrative examples.Question 2 1 ptsPhotosynthetic algae vary in size. As their size increases, for example by a doubling of their diameter, how does the ratio of their surface area to volume change?The surface area/volume ratio decreases significantlyThe surface area/volume ratio increases significantlyThe surface area/volume ratio doesn’t changeThe surface area/volume ratio decreases slightlyThe surface area/volume ratio increases slightlyQuestion 3 3 ptsSelect the three statements from the options presented below that accurately describe the characteristics of photosynthesis as performed by land plants and marine algae (ocean plants).Land plants capture CO2 directly from the atmosphereAlgae capture CO2 directly from the atmosphereLand plants absorb nutrients from soilsAlgae absorb CO2 and nutrients from seawaterLand plants absorb water directly from rainfallLand plants absorb CO2 from soilsQuestion 4 :1 ptsWhich of the following depth zones of pelagic environments represents the greatest volume of these ocean habitats?Epipelagic (0 – 200 m)Mesopelagic (200 – 1000 m)Bathypelagic (1000 – 2000 m)Abyssalpelagic (2000 – 6000 m)Hadalpelagic (> 6000 m)


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Oceans & Global Environment
Module 12: Marine Ecology
•Phytoplankton – Nutrients, CO2
• Plant life in the ocean – acquiring
photosynthetic substrates (nutrients,
CO2) from water.
• Photosynthesis in photic zone.
• Implications of phytoplankton size.
Key Concepts?
•Photosynthetic Plankton
blooms as red
• Requirement for photosynthetic
substrates absorbed through cell.
• Dependent on light, nutrient availability.
G131 Oceans & Global Environment
Diatom bloom in Arabian Sea
Plants on Land & in the Ocean
Nutrient Sources
•Land plants:
• CO2 from air.
• Nutrients and
water from soil
via roots.
•Ocean plants:
• Photic zone.
• Dissolved CO2
and nutrients
from seawater.
G131 Oceans & Global Environment
Ocean Plants: Algae
Marine plants need to be
suspended in photic zone
Size Variation
• Diatoms: centric or
Shape also
Size affects surface to volume ratio,
with consequences for buoyancy, light
accessibility, intake of CO2 & nutrients.
G131 Oceans & Global Environment
Oceans & Global Environment
Module 12: Marine Ecology
•Marine Provinces & Phytoplankton
• Division of oceanic regions based on depth.
• Distinction of pelagic & benthic organisms.
• Characteristics of plankton, nekton &
Key Concepts
•Understanding controls on life in
the ocean:
• Divisions of the oceanic realm according to
depth, paralleling light availability.
• Classification of lifestyles of marine biota.
G131 Oceans & Global Environment
Phytoplankton blooms
Pelagic & Benthic Provinces
Zonal Division of the Oceans
within the
and on the
are divided
G131 Oceans &
Global Environment
Oceans & Global Environment
Zones & Water Column
•Marine habitats: divisions
according to depth & also light
Percentage Marine Habitats
Abyssal zone
majority of ocean
Division of water
column into
discrete depth
zones based on
light availability
G131 Oceans & Global Environment
Lifestyles of Marine Organisms
Pelagic vs. Benthic
•Plankton: Drifting Organisms
• Phytoplankton (photosynthetic plants).
• Zooplankton (animals) & larvae.
• Bacteria & Archaea.
•Nekton: Swimming Organisms
• Cephalopods (squid), fish (bony &
cartilagenous), reptiles, mammals.
•Benthos: Seafloor dwellers
• Epiflora (benthic algae), epifauna
(surface) & infauna (burrowing).
G131 Oceans & Global Environment

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