मराठी

Will the levels of biological magnification be different at different levels of the ecosystem?

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प्रश्न

Will the levels of biological magnification be different at different levels of the ecosystem?

थोडक्यात उत्तर
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उत्तर १

The levels of biomagnification will be different at different trophic levels. For example, in a pond of water, DDT was sprayed and the producers were found to have 0.04 ppm concentration of DDT. Since many types of plankton are eaten by some fish and clams, their bodies accumulate 0.23 ppm of DDT. A seagull that feeds on clams accumulates more DDT as one seagull eats many clams. Hawk, the top carnivore, has the highest concentration of DDT.
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उत्तर २

The level of these harmful substances will go on increasing from one trophic level to the next. When certain harmful substances enter the food chain at the level of primary producers, they get concentrated many times at each subsequent trophic level.

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पाठ 13: Our Environment - EXERCISE [पृष्ठ २१७]

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एनसीईआरटी Science [English] Class 10
पाठ 13 Our Environment
EXERCISE | Q 6. (ii) | पृष्ठ २१७

व्हिडिओ ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्‍न

List two important roles play in the environment by decomposers.


Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem?


What is biological magnification?


In the following food chain, 100 J of energy is available to the lion. How much energy was available to the producer?

Plants → Deer → Lion


Give an example of a four step food chain operating in grassland. Name the secondary consumer in this food chain


Draw the food chain with four trophic levels.


Write down a food chain which ends with humans.


Explain how harmful chemicals enter our bodies.


Consider the following food chain

(i) Plants → Mice → Snakes → Hawks
(ii) Plants → Mice →Hawks
If energy available at the producer level in both the food chains is 100 J, in which case will hawks get more energy as food and by how much? Justify your answer.:


Bacteria and fungi are called decomposers.


Observe the food web and answer the questions given below:

Why do all food chains start with plants?


The sequence of who eats whom in an ecosystem is called as ______.


What are autotrophs? 


Define – Heterotrophs.


In a food chain, the third trophic level is always occupied by


Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as


Which statement is correct with respect to the food chain?


If a harmful chemical enters a food chain comprising peacocks, plants, rats and snakes, which of these organisms is likely to have the highest concentration of the chemical in its body? Justify your answer. Name the process involved and define it.


Study the picture given below showing three food chains (a), (b) and (c) and answer the following questions:

  1. Name the type of ecosystems that exist in food chains (b) and (c).
  2. The first trophic level in all food chains is producers. Why? What percentage of solar energy do these producers capture for their use?
  3. Why are the arrows shown in the diagram in one direction only and not vice versa? Justify.

Primary consumers are characterized as:


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