Bissoy.com
Doctors Medicines MCQs Q&A

Statements about Eutrophication : (a) The eutrophication occurs in the lotic water body primarily in the hilly regions. (b)  The eutrophication occurs in lentic water and there is a gradual accumulation of organism and their products. (c) Eutrophication promotes fish growth as algal blooms serve as a source of food for fishes. (d) The eutrophicated water is oxygen-rich and safe for human consumption without treatment. Which is /are the correct statement(s) ?

Statements about Eutrophication : (a) The eutrophication occurs in the lotic water body primarily in the hilly regions. (b)  The eutrophication occurs in lentic water and there is a gradual accumulation of organism and their products. (c) Eutrophication promotes fish growth as algal blooms serve as a source of food for fishes. (d) The eutrophicated water is oxygen-rich and safe for human consumption without treatment. Which is /are the correct statement(s) ? Correct Answer (b) and (c)

The correct answer is (b)and (c)

Key Points 

  • Eutrophication:
    • It is the process of excessive plant and algal growth in the lentic region of the water body. Hence, statement a is not correct.
    • Due to Eutrophication, there is a gradual accumulation of Organism in this lentic region. Hence, statement b is correct.
    • It occurs because of the increased availability of either Sunlight, carbon dioxide, and Nutrient Fertilizers.
    • It can also occur due to human activities like the discharge of harmful pollutants like Nitrogen and Phosphorus into aquatic systems. 
    • Eutrophication promotes heavy algal growth and fish. It also reduces the amount of sunlight penetrating into the water body.Hence, statement c is correct  
    • Due to Eutrophication increased algal growth increases the PH of water and causes the algae to die too soon thereby dissolving oxygen. Hence making less availability of Oxygen called hypoxia or anoxic conditions.
    • It causes the creation of Dead zones i.e., which contain less oxygen available for the survival of various organisms in the water. Hence, statement d is not correct.

Related Questions

Weight of Fish A is twice that of Fish B. Weight of Fish B is half of Fish C. Weight of Fish C is 3 times of Fish D. Weight of Fish D is half of Fish E. Which fish is the lightest and second-lightest of the five fishes?
There are some fishes in the pond. 15% of the fishes in pond died due to pollution in the pond. 25% were eaten up by the birds. 25% of the remaining fishes were caught by a fisherman. How many fishes were there in the beginning if 90 fishes are left in the pond?
Nine individuals - Z, Y, X, W, V, U, T, S and R - are the only candidates, who can serve on three committees-K1, K2 and K3, and each candidate should serve on exactly one of the committees. Committee K1 should consist of exactly one member more than committee K2. It is possible that there are no members in committee K3. Among Z, Y and X none can serve on committee 10. Among W, V and U none can serve on committee K2. Among T, S and R none can serve on committee K3. In case committee K2 is served by T and Z only, how many of the nine individuals should serve on committee K3?  Of the nine individuals, the largest number that can serve together on committee K3 is:
Read the passage carefully and choose the best answer to each question out of the four alternatives. The instructor's rules were simple. Breathe through your mouth, not your nose; else the mask will fog up. Easier said than done; I got it wrong many a time. But once you fought habit and got the hang of it, the panoramic underwater world revealed itself to you with high-definition clarity. Led by him, I slowly peered through the mask into what till then was crystal-clear water, shimmering in the sunlight. I saw pebbles, sand and my fluid shadow. I was in Nemo's universe. Sea cucumbers, sea anemone, clown fish, star fish, sea horses, parrot fish, butterfly fish and a bevy of colourful salt water fish swam past. A shoal of canary-yellow fish did a merry dance and another with vibrant blue fish followed it. They were oblivious to the snorkelers who struggled to take in the sight of a world so beautiful, so colourful, and resist opening their mouth wide in amazement; the tube would fall off! When would there be a risk of the tube falling off?
Read the passage carefully and choose the best answer to each question out of the four alternatives. The instructor's rules were simple. Breathe through your mouth, not your nose; else the mask will fog up. Easier said than done; I got it wrong many a time. But once you fought habit and got the hang of it, the panoramic underwater world revealed itself to you with high-definition clarity. Led by him, I slowly peered through the mask into what till then was crystal-clear water, shimmering in the sunlight. I saw pebbles, sand and myfluid shadow. I was in Nemo's universe. Sea cucumbers, sea anemone, clown fish, star fish, sea horses, parrot fish, butterfly fish and a bevy ofcolourful salt water fish swam past. A shoal of canary-yellow fish did a merry dance and another with vibrant blue fish followed it. They wereoblivious to the snorkelers who struggled to take in the sight of a world so beautiful, so colourful, and resist opening their mouth wide inamazement; the tube would fall off!
The writer is describing her experience of which activity?
Read the passage carefully and choose the best answer to each question out of the four alternatives. The instructor's rules were simple. Breathe through your mouth, not your nose; else the mask will fog up. Easier said than done; I got it wrong many a time. But once you fought habit and got the hang of it, the panoramic underwater world revealed itself to you with high-definition clarity. Led by him, I slowly peered through the mask into what till then was crystal-clear water, shimmering in the sunlight. I saw pebbles, sand and my fluid shadow. I was in Nemo's universe. Sea cucumbers, sea anemone, clown fish, star fish, sea horses, parrot fish, butterfly fish and a bevy of colourful salt water fish swam past. A shoal of canary-yellow fish did a merry dance and another with vibrant blue fish followed it. They were oblivious to the snorkelers who struggled to take in the sight of a world so beautiful, so colourful, and resist opening their mouth wide in amazement; the tube would fall off! How to avoid the mask fogging up?
Read the passage carefully and choose the best answer to each question out of the four alternatives. The instructor's rules were simple. Breathe through your mouth, not your nose; else the mask will fog up. Easier said than done; I got it wrong many a time. But once you fought habit and got the hang of it, the panoramic underwater world revealed itself to you with high-definition clarity. Led by him, I slowly peered through the mask into what till then was crystal-clear water, shimmering in the sunlight. I saw pebbles, sand and my fluid shadow. I was in Nemo's universe. Sea cucumbers, sea anemone, clown fish, star fish, sea horses, parrot fish, butterfly fish and a bevy of colourful salt water fish swam past. A shoal of canary-yellow fish did a merry dance and another with vibrant blue fish followed it. They were oblivious to the snorkelers who struggled to take in the sight of a world so beautiful, so colourful, and resist opening their mouth wide in amazement; the tube would fall off! What is 'Nemo'?
Read the passage carefully and choose the best answer to each question out of the four alternatives. The instructor's rules were simple. Breathe through your mouth, not your nose; else the mask will fog up. Easier said than done; I got it wrong many a time. But once you fought habit and got the hang of it, the panoramic underwater world revealed itself to you with high-definition clarity. Led by him, I slowly peered through the mask into what till then was crystal-clear water, shimmering in the sunlight. I saw pebbles, sand and my fluid shadow. I was in Nemo's universe. Sea cucumbers, sea anemone, clown fish, star fish, sea horses, parrot fish, butterfly fish and a bevy of colourful salt water fish swam past. A shoal of canary-yellow fish did a merry dance and another with vibrant blue fish followed it. They were oblivious to the snorkelers who struggled to take in the sight of a world so beautiful, so colourful, and resist opening their mouth wide in amazement; the tube would fall off! The writer saw all of the following except:
Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements. Only conclusions I and II follow. Statements: Some species are fishes. All fishes are frogs. No frog is a turtle. Conclusions: I. Some frogs are fishes. II. Some species are frogs. III. Some fishes are turtles. 
Nine individuals - Z, Y, X, W, V, U, T, S and R - are the only candidates, who can serve on three committees-K1, K2 and K3, and each candidate should serve on exactly one of the committees. Committee K1 should consist of exactly one member more than committee K2. It is possible that there are no members in committee K3. Among Z, Y and X none can serve on committee 10. Among W, V and U none can serve on committee K2. Among T, S and R none can serve on committee K3. In case committee K2 is served by T and Z only, how many of the nine individuals should serve on committee K3?