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AICE Marine Science A Level questions with correct answers.
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AICE Marine Science A Level questions with correct answers.
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AICE Marine Science A Level questions with correctanswers
Primary producers Correct Answer-fix carbon, in the process of
photosynthesis, making organic substances which are then made
available to higher trophic levels.
Primary producers in marine ecosystems Correct Answer-phytoplankton,
larger algae such as Sargassum, and flowering plants such as the sea
grasses.
Function of sea grasses Correct Answer-provides food for primary
consumers, a habitat for many other organisms, and shelter for juvenile
fish. help to reduce water current speed and increase sedimentation. their
roots and rhizomes stabilize the substrate, and therefore reduce coastal
erosion.
Types of phytoplankton Correct Answer-diatoms, dinoflagellates,
cyanobacteria
Sargassum Correct Answer-widely distributed in tropical and temperate
oceans. typically grows in shallow water and coral reefs, but there are
also free-floating planktonic species.
Sea grasses Correct Answer-grow in shallow, sheltered areas, rooted in a
muddy or sandy substrate.
, Kelp forests Correct Answer-occur in cool, clear waters in depths of up
to about 40 m.
Chemosynthesis Correct Answer-using energy derived from the
oxidation of inorganic substances such as hydrogen sulfide and
ammonia. occurs in the deep ocean around hydrothermal vents. the total
fixation of carbon by chemosynthesis is small compared with
photosynthesis.
Chloroplasts Correct Answer-organelles in which photosynthesis occurs.
contain a number of pigments which absorb light energy and start the
process of photosynthesis.
Factors affecting the rate of photosynthesis Correct Answer-light
intensity, light wavelength, concentration of carbon dioxide, temperature
Light intensity Correct Answer-in the absence of light, no
photosynthesis occurs, but respiration continues. as the light intensity
increases, the rate of photosynthesis increases. eventually, the rate of
photosynthesis levels out and reaches a plateau.
Temperature Correct Answer-as temperature increases, the rate of
photosynthesis increases up to an optimum. above this temperature, the
rate of photosynthesis declines as the temperature increased. different
species of phytoplankton are adapted to different temperature ranges.
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