Question

Match the following :

I	II
1. Oligotrophic lakes	(a) created due to the construction of dams
2. Dystrophic lakes	(b) low pH and high humic acid content
3. Meromictic lakes	(c) low nutrient concentration
4. Impoundments	(d) rich in salts and permanently stratified

Select the correct matching using the code given below :
1. 1 - d, 2 - a, 3 - c, 4 - b
2. 1 - d, 2 - a, 3 - b, 4 - c
3. 1 - c, 2 - b, 3 - a, 4 - d
4. 1 - c, 2 - b, 3 - d, 4 - a

Answer 1

Correct Answer - Option 4 : 1 - c, 2 - b, 3 - d, 4 - a

The correct answer is d

• An Oligotrophic Lake has low nutrients and low productivity.
• These lakes have low algal production, and consequently, often have very clear waters, with high drinking-water quality.
• Lakes that have to intermix their layers are classified into the category of holomictic, whereas lakes that do not have interlayer mixing are permanently stratified and thus are termed meromictic.
• Dystrophic lakes, also known as humic lakes, are lakes that contain high amounts of humic substances and organic acids. The presence of these substances causes the water to be brown in color and have a generally low pH of around 4.0-6.0
• Impoundments are a body of water confined within an enclosure, as a reservoir.

• An oligotrophic lake is a lake with low primary productivity, as a result of low nutrient content.
• These lakes have low algal production, and consequently, often have very clear waters, with high drinking-water quality.
• Oligotrophic lakes are most common in cold, sparsely developed regions that are underlain by crystalline igneous, granitic bedrock.
• Due to their low algal production, these lakes consequently have very clear waters, with high drinking-water quality.