Tag: the effects of human activities on ecosystems

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Questions Related to the effects of human activities on ecosystems

Multiple choice zoology our environment - our concern biomagnification the effects of human activities on ecosystems bioaccumulation and biomagnification

The phenomenon of accumulation of heavy metal and pesticide in trophic level is called as

  1. Eutrophication

  2. Biomagnification

  3. Composting

  4. Mining
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Biomagnification is defined as the process by which a compound (such as a pollutant or pesticide) increases its concentration in the tissues of organisms as it moves up the trophic levels

So, the correct answer is 'Biomagnification'

Multiple choice zoology our environment - our concern biomagnification the effects of human activities on ecosystems bioaccumulation and biomagnification

Biomagnification refers to?

  1. Breeding of crops that are rich in minerals and vitamins, good proteins and healthier fats for human health

  2. Increase in concentration of the toxicant at successive trophic levels

  3. Exploiting at molecular, Genetic and species level diversity for the products of economic importance

  4. Decomposition of organic waste in water by the action of microbes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Biomagnification is the process where the concentration of a toxic substance increases as it moves up the food chain. This occurs because the toxin is not easily degraded or excreted.

Multiple choice zoology our environment - our concern biomagnification the effects of human activities on ecosystems bioaccumulation and biomagnification

The occurrence of pesticides like DDT in higher trophic levels is termed as

  1. bioremediation

  2. biomagnification

  3. biological enhancement

  4. biopollution
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The accumulation of persistent chemicals like DDT in higher trophic levels is the definition of biomagnification. It is a major environmental concern for apex predators.

Multiple choice zoology our environment - our concern biomagnification the effects of human activities on ecosystems bioaccumulation and biomagnification

The term "bio-magnification" refers to the

  1. Growth of organism due to food consumption.

  2. Increase in population size.

  3. Blowing up of environmental issues by man

  4. Increase in the concentration of non-degradable pollutants as they pass through food chain.

  5. Decrease in population size.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The biotic components of an ecosystem are arranged in several trophic levels which are interdependent on each other. The energy produced at one level is passed to another level. Biomagnification refers to increase in concentration of the toxicant at successive trophic levels. This happens because a toxic substance accumulated by an organism cannot be metabolised or excreted, and is thus passed on to the next higher trophic level. This phenomenon is well known for mercury and DDT. 

Multiple choice zoology our environment - our concern biomagnification the effects of human activities on ecosystems bioaccumulation and biomagnification

Which of the following is associated with biological amplification? 

  1. SO$ _4$

  2. DDT

  3. Sewage

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The different trophic level of an ecosystem interacts with each other and they are interdependent on each other. Biological magnification is a process where pollutants such as pesticides or heavy metals move up the food chain, passes into rivers or lakes and consumed by aquatic organisms such as fish, which in turn are eaten by large birds, animals or humans. It occurs when the concentration of a substance, such as DDT or mercury, in an organism, exceeds the background concentration of the substance in its diet. 

Thus, the correct answer is option B.

Multiple choice zoology our environment - our concern biomagnification the effects of human activities on ecosystems bioaccumulation and biomagnification

Biomagnification means

  1. Accumulation of pesticide through food chain

  2. Accumulation of pesticide in water

  3. Increased pesticide degradation

  4. Decrease pesticide degradation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Biomagnification refers to increase in concentration of the toxicant at successive trophic levels. This happens because a toxic substance accumulated by an organism cannot be metabolised or excreted, and is thus passed on to the next higher trophic level. Thus, the correct answer is option A.

Multiple choice zoology our environment - our concern biomagnification the effects of human activities on ecosystems bioaccumulation and biomagnification

The term 'bio-magnification' refers to the 

  1. Increase in population size

  2. Increase in the concentration of non-degradable pollutants as they pass through the food chains

  3. Blowing up of environmental issues by man

  4. Growth of organisation due to food consumption
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Biomagnification (or bioaccumulation) refers to the increase in the concentration of non-degradable pollutants as they pass through the food chains. It is the process whereby certain substances such as pesticides or heavy metals move up the food chain, work their way into rivers or lakes, and are eaten by aquatic organisms such as fish, which in turn are eaten by large birds, animals or humans. 

Therefore, the correct answer is option B.

Multiple choice zoology our environment - our concern biomagnification the effects of human activities on ecosystems bioaccumulation and biomagnification

Increasing concentration of accumulated pollutant along food chain is

  1. Biomagnification

  2. Bioaccumulation

  3. Eutrophication

  4. Nutrient cycling
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A few toxic substances, often present in industrial wastewaters, can undergo biological magnification (biomagnification) in the aquatic food chain. Biomagnification refers to an increase in the concentration of the toxicant at successive trophic levels. This happens because a toxic substance accumulated by an organism cannot be metabolised or excreted, and is thus passed on to the next higher trophic level in a food chain.

Multiple choice zoology our environment - our concern biomagnification the effects of human activities on ecosystems bioaccumulation and biomagnification

Biological magnification refers to

  1. Increase in the concentration of insecticide in animals

  2. Increase in the concentration of organophosphate in plants

  3. Decrease in the concentration of insecticide in animals

  4. Increase in the number of animals and plants in ecosystem
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Biomagnification is the accumulation or increasing concentration of lipophilic pesticides in the top members of the food chain. During biomagnification, the concentration of non-degradable pesticide like DDT goes on increasing along the food chain and highest values occur in the consumers of the top trophic level. So, the value of pesticide will go on increasing at each trophic level. 

Thus, the correct answer is option A.