化学考试题

1. Sulfur is an important micronutrient in
the growth of aquatic plants. Explain, in
chemical terms, why this element is
required.

2. In a stratified lake there are distinct vertical
profiles from surface to bottom for the various
chemical forms of plant nutrients. Draw out
the vertical profile that would be expected for
the nutrient salt orthophosphate (PO4
-3) in a
stratified eutrophic lake and explain why this
profile would be expected.

3. Explain why the surface waters of the Oceans
are depleted in N & P and will remain
indefinitely in this state.

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