Nutrients：练习题

Which of the following major nutrient groups is primarily recognized for providing immediate and readily available energy to marine organisms?

In the nutrient cycle, how do essential elements like nitrogen, carbon, and phosphorus initially enter the marine food chain?

The continuous cycling of nutrients is essential for the stability of marine ecosystems. If the process of decomposers breaking down dead organic matter were significantly inhibited, what would be the most immediate and widespread consequence for primary productivity?

According to the IGCSE syllabus definition, what is the primary role of nutrients required by an organism?

Describe the sequence of events that allows nutrients, initially taken up by marine producers, to eventually return to the surface waters for reuse.

For what biological purpose do marine organisms primarily use the essential element nitrogen?

Describe how lipids provide a survival advantage to deep-diving marine mammals in terms of their buoyancy and long-term energy storage.

Marine producers take up carbon in the form of dissolved carbon dioxide. Describe how this element is incorporated into two different classes of organic compounds and state the primary function of each class for organisms in a marine food web.

Describe the composition of seawater, using the terms solvent, solute, and solution, with specific reference to sodium chloride as a component.

Outline the cycling of nutrients within a typical marine ecosystem, starting from their uptake by producers and concluding with their return to the water column.