6.Which of the below is the definition of Net Primary Productivity (NPP)? (A) Gross primary productivity minus respiration by consumers. (B) Gross primary productivity plus respiration by plants. (C) Respiration by producers minus gross primary productivity. (D) Gross primary productivity minus respiration by producers.

2.Which of the following statements about the River Continuum Concept is incorrect? (A) From upstream to downstream, FPOM is gradually replaced by increasingly abundant CPOM. (B) Many fishes in headwater streams require well-oxygenated water. (C) Microbes are significant consumers throughout much of the river continuum. (D) Benthic invertebrates can be classified into functional feeding groups (e.g., collectors, grazers/scrapers, shredders) based on how they acquire organic matter.

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