Question

A fish-eating bird species were found to have a specific, heavy metal concentration of 700,000 ppt (parts per trillion). The conclusion based on the data is
A)Air pollution may have caused this bird species to inhale dangerous amounts of heavy metals while migrating.
B)The entire population of the bird species from which this sample was taken, died.
C)The population of this bird species exploded, causing an ecosystem imbalance.
D)Pollutants tend to collect in areas of land where this bird species nests.
E)This bird species is at a high trophic level on the food chain

Answer 1

It is a process that can be defined as the rise or increase in the contaminated substances caused by the intoxicating environment in the tissues of tolerant organisms at successively higher levels in a food chain.

Complete answer:
This question deals with biomagnification.
-At the higher trophic levels in a food chain organisms experience biomagnification due to the accumulation of environmental toxins like heavy metals in the living tissue.
-With the food organisms accumulate a small number of toxins that generally live in the lower trophic levels as many of the lower-level organisms are eaten up by the organisms living in the next highest trophic level.
-it can be very dangerous by the increasing concentration of toxins in the tissue of the organism at the highest trophic levels.
-So, this fish-eating bird has a specific high heavy metal concentration of about 700,000 ppt (parts per trillion). Therefore, it is obvious that the species must be at a high trophic level.

Additional information
Choice (A) is incorrect because the major problem of heavy metals in the tissue of visiting is due to magnification even though air pollution also has heavy metals in the air.
Choice (B) is incorrect because the high concentration of heavy metal in the tissue of one fish-eating bird does not imply that all birds of that species in the population died.
Choice (C) is incorrect because the explosive increase of populations is not related to the high concentration of heavy metals and cause the total opposite effect
Choice (D) is incorrect because land pollutants would be in the soil. This species eats fish rather than soil organisms or plants, so the heavy metals present in toxic soil wouldn’t make their way into the bird’s tissue at such high levels.

So, the correct answer is, “This bird species is at a high trophic level on the food chain”.

Note:
-increasing the concentration of harmful substances or chemicals in the normal food chain process is known as biomagnification. It causes a negative effect on many living things and may cause death due to an increase in harmful chemicals
-DDT and MERCURY are well known for biomagnification. DDT Accumulation has a great effect on fish-eating birds. It causes thinning of the egg cells due to disturbance in the calcium metabolism in birds.