Bissoy.com
Doctors Medicines MCQs Q&A

Following is an ecosystem of water-body, showing the concentration of DDT in each trophic levels. Water →  Algae → Fish → Pelican bird 1700 ppm → 500-600 ppm → 77 ppm → 0.2 ppm Which of the following feature is incorrect if the above is to represent biomagnification?

Following is an ecosystem of water-body, showing the concentration of DDT in each trophic levels. Water →  Algae → Fish → Pelican bird 1700 ppm → 500-600 ppm → 77 ppm → 0.2 ppm Which of the following feature is incorrect if the above is to represent biomagnification? Correct Answer The concentration of DDT should increase as we go to higher trophic-levels

The correct answer is the concentration of DDT should increase as we go to higher trophic-levels.

Explanation:

  • Biomagnification or biological magnification is defined as an increase in the concentration of toxicants at successive trophic levels.
  • DDT (dichlorodiphenyldichloroethane) and mercury are well known for biological magnification.
  • DDT is a pesticide that is non-degradable and so tends to enter organisms.
  • Their concentration increases with each tropical level. 
  • DDT concentrations in the water begin at 0.003 ppb (parts per billion).
  • Its concentration rises by biological magnification with each tropical level, reaching up to 25 ppm (parts per million) in fish-eating birds.
  • This is due to the fact that consumers at each subsequent trophic level consume more energy than the previous level.
  • When toxic compounds enter the aquatic food chain, they get accumulated in the organism's body and cannot be excreted and metabolised, so they pass it from one trophic level to the next.
  • Thus, The concentration of DDT should increase as we go to higher trophic levels. Hence option 2 is incorrect.

Related Questions

Dichlorodiphenyl Trichloro Ethane (DDT) is the first chlorinated organic insecticide for the discovery of its effectiveness as an insecticide Paul Muller was awarded Nobel Prize in Medicine and physiology in 1948. (a) DDT is effective against mosquitos that spread malaria. (b) DDT is effective against lice that carry typhus. (c) DDT has high toxicity towards fish. (d) DDT is not metabolised easily by animals. Which of the above statements are correct? 
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?
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! The writer saw all of the following except:
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! When would there be a risk of the tube falling off?
Consider the following statements. 1. The energy pyramid of an ecosystem is always upright and narrows to the top. 2. The biomass in the lower trophic levels is generally very high as compared to the higher trophic levels. Which of the above statements is/are correct?
Which of the following statements are true? 1. Algae contain chlorophyll. 2. Algae can prepare their own food. 3. Algae do not require water for photosynthesis. 4. Algae needs oxygen as raw material for photosynthesis.
Consider the following pairs of Aquatic Food Chain: Trophic level Organisms 1. Primary Producer A. Pelican 2. Primary Consumer B. Fish 3. Secondary Consumer C. Zooplankton 4. Tertiary Consumer D. Phytoplankton  Which among the following given pairs is correct?