This set of Environmental Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Biological Zones in Lake”.
1. ______ zone lies between Euphotic and Benthic zone.
a) Euphotic zone
b) Benthic zone
c) Littoral zone
d) Climate zone
View Answer
Explanation: Littoral zone lies between Euphotic and Benthic zone. The growth of aquatic plants takes place in this zone.
2. The uppermost zone in lakes is called as ____________
a) Euphotic zone
b) Benthic zone
c) Littoral zone
d) Climate zone
View Answer
Explanation: The uppermost zone in lakes is called as Euphotic zone where sunlight passes through the lake and growth of plants takes place.
3. _______ is the process of overgrowth of plants and algae in lakes.
a) Transpiration
b) Reproduction
c) Eutrophication
d) Photosynthesis
View Answer
Explanation: The process of overgrowth of plants and algae in lakes is called Eutrophication. It decreases the oxygen concentration of water.
4. Which of the following promotes eutrophication of lakes?
a) Magnesium
b) Sodium
c) Calcium
d) Phosphorous
View Answer
Explanation: Phosphorous promotes the eutrophication of lakes as it is helpful for the growth of plants in lakes. It can easily reach the lakes through industrial water.
5. In which zone, decomposition of the dead organism takes place?
a) Climate zone
b) Benthic zone
c) Littoral zone
d) Euphotic zone
View Answer
Explanation: In Benthic zone, the dead organism settled down where their decomposition takes place by the bacteria.
6. Which one of the following lakes has minimum productivity?
a) Mesotrophic lake
b) Senescent lake
c) Oligotrophic lake
d) Eutrophic lake
View Answer
Explanation: Oligotrophic lake has minimum productivity due to the presence of low phosphorous, nitrogen and other nutrients in the lake.
7. ________ is the process of acceleration of eutrophication due to increased phosphorous content in lakes.
a) Photosynthesis
b) Chemical eutrophication
c) Cultural eutrophication
d) Custom eutrophication
View Answer
Explanation: Cultural eutrophication is the acceleration of eutrophication due to excessive nutrients in the water. It results in the death of aquatic plants and animals.
8. The eutrophication process leads to turbidity in lakes.
a) True
b) False
View Answer
Explanation: The eutrophication process causes the algal bloom which results in the milkiness in water causing turbidity.
9. Which type of pollution is Cultural eutrophication?
a) Water pollution
b) Noise pollution
c) Thermal pollution
d) Soil pollution
View Answer
Explanation: Cultural eutrophication is a water pollution due to the presence of excessive nutrients from house waste, industries, etc. that pollutes the lake, decreases the oxygen level and destroys the aquatic ecosystem.
10. The lakes are classified into how many types on the basis of productivity?
a) 2
b) 3
c) 4
d) 6
View Answer
Explanation: The lakes are classified into 4 types on the basis of productivity, namely Senescent, Oligotrophic, Eutrophic and Mesotrophic.
11. The depth of Euphotic zone is measured by ____________
a) Calorimeter
b) Turbidity meter
c) Secchi disk
d) Radar
View Answer
Explanation: The depth of Euphotic zone is measured by Secchi disk where it is put in the lake and the depth at which the disk becomes invisible is taken as the depth of Euphotic zone.
Sanfoundry Global Education & Learning Series – Environmental Engineering.
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