What can hinder photosynthetic productivity in the open ocean?
a. Light
b. Carbon dioxide
c. Iron
d. Conservative nutrients
ANS: C
Iron becomes the limiting factor in many open water areas that have all the other necessities for
photosynthesis. Photosynthetic autotrophs only require four main ingredients for success: sunlight,
water, carbon dioxide, and inorganic nutrients. Information can be found in the section Lack of
Nutrients and Light can limit Primary Productivity.
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