Many Lakes in the United States Are Suffering from Periodic

question 11

Multiple Choice

Many lakes in the United States are suffering from periodic algae blooms, which can be thought of as an infection of the lake. Although the algae are naturally-occurring in the lake, when adjacent farm ?elds are over-fertilized with diammonium phosphate, the run-off deposits these nutrients in the lake, allowing the algae to grow without limit. Which of the following statements is incorrect regarding the overgrowth of algae?

• A) The algae are heterotrophs.
• B) Lakes have su?cient micronutrients for algae to grow.
• C) The phosphorus in the fertilizer is in the phosphate form, the preferred phosphorus source of most microbes.
• D) The carbon source for these algae is not limiting in lakes.
• E) The nitrogen in the fertilizer is in the ammonium form, the preferred nitrogen source of most microbes.

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