Oligotrophic lakes are characterized by:
Low level of nutrients
Lakes are classified on the basis of their productivity and nutrient content. An oligotrophic lake is characterized by a Low level of nutrients. The prefix oligo- means few or scanty and trophic refers to nourishment, so an oligotrophic water body is one that is poor in the plant nutrients nitrogen and phosphorus. Such lakes are typically deep, cold and clear, with high dissolved oxygen throughout, low biological productivity, sparse algal growth and good water transparency.
The correct characteristic is therefore Low level of nutrients.
A high level of nutrients describes a eutrophic lake, which is the opposite condition, marked by rich nutrient loading, dense algal blooms and often oxygen depletion in deeper waters, so that option is incorrect. Absence of nutrients is wrong because oligotrophic lakes are nutrient-poor but not nutrient-free; life is still supported, only at low productivity. A high level of organic matter is also wrong, since abundant organic matter and its decomposition are features of eutrophic and nutrient-rich systems, not of nutrient-poor oligotrophic lakes.
Correct answer: Low level of nutrients
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