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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Algal blooms in oligotrophic lakes are
Important Questions from Ecology and Ecosystem
- Consider the following statements and choose the correct one:
A. 'Bio' is a Greek word means life
B. Biosphere is an integral part of the earth system which supports all kinds of life
C. All the biological components of the Earth living as well as the dead, fall in the category of biosphere.
D. The term 'Biosphere' has been coined by Peter Suess.
Choose the correct answer from the options given below : Which of the following statements are correct about nutrient cycle ?
A. Carbon dioxide gas which makes up about 0.040% of the volume of the earth's atmosphere
B. Specialised bacteria convert most of the $NH_3$ and $NH_4^+$ in the soil to nitrate ions $NO_3$-
C. Phosphorus does cycle through the atmosphere and its cycle is fast
D. Much of the earth's sulfur is stored underground in rocks and minerals
Choose the most appropriate answer from the options given below:- Which of the following statements are correct about 'ecological succession'?
A. Gradual Change in species composition in a given area is called ecological succession
B. Primary ecological succession does not involve the gradual establishment of communities in lifeless areas
C. Secondary ecological succession means series of ecosystems of different species develop in places containing soil
D. Ecological succession is not an important ecosystem service
Choose the most appropriate answer from the options given below : - Food web consists of different types of __________.
The role and position of an organism in the ecosystem encompassing both the physical space it occupies and its functional role with in the community is known as:
