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प्रश्न
In a food chain, the third trophic level is always occupied by
विकल्प
carnivores
herbivores
decomposers
decomposers
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उत्तर
carnivores
Explanation -
A food chains always starts with plants or producers so they occupy the first trophic level. The plants in turn, are consumed by herbivores which occupy the second trophic level. Primary carnivores eat the herbivores and occupy third trophic level.
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संबंधित प्रश्न
In a food chain of frog, grass, insect and snake, assign trophic level to frog.
List two biotic components of a biosphere.
In the following food chain, 20,000 J of energy was available to the plants. How much energy would be available to man in this chain?
Plants → Sheep → Man
Fill in the following blank with suitable word :
A series of organisms, each of which feeds on the next organism, the beginning of which is a green plant, is called a .............
Explain the terms 'producer' and 'consumer'. Give two examples of producers and two of consumers.
Define decomposers.
What is a trophic level?
Construct a short foodchain, ending with man.
Which of the following is not a producer?
(a) grass
(b) zooplankton
(c) phytoplankton
(d) paddy
One of the following is a micro-consumer. This one is :
(a) ant
(b) lice
(c) fungi
(d) mosquito
Fill in the following blank with suitable word :
Pesticides enter the food chain at the ...........level
What is ten per cent law? Explain with an example.
Will the levels of biological magnification be different at different levels of the ecosystem?
Which common pesticide has accumulated in human body in considerable amounts?
A food chain consists of fish, larvae, phytoplanktons and birds. The level of pesticides in water in which the fish, larvae and phytoplanktons live is quite high.
(a) In which organisms the pesticides enter from the polluted water? What is this level of organisms known as?
Arrange the following in a correct sequence and form a food chain
Rabbit → Carrot → Eagle → Snake
A food chain comprising birds, green plants, fish and man. The concentration of harmful chemical entering the food chain will be maximum in ______.
What are autotrophs?
DDT was sprayed in a lake to regulate breeding of mosquitoes. How would it affect the trophic levels in the following food chain associated with a lake? Justify your answer.
Study the picture given below showing three food chains (a), (b) and (c) and answer the following questions:

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