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प्रश्न
Write one or two word for the following statement/definition :
Each level of food chain where transfer of energy takes place
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उत्तर
Trophic level.
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संबंधित प्रश्न
Which of the following are always at the second tropic level of food chains?
Give reason to justify the following: Flow of energy in a food chain is unidirectional.
The following statement is true or false :
Secondary consumers and tertiary consumers, both are carnivores.
Define decomposers.
What is meant by a primary consumer, secondary consumer and a tertiary consumer? Give one example of each.
Can the organisms of any trophic level be removed without causing any damage to the ecosystem? Will the impact of removing all the organisms in a trophic level be different for different trophic levels?
Write down a food chain with five links in it.
Write one or two word for the following statement/definition :
Organisms which depend on the producers for food either directly or indirectly
The decomposers in an ecosystem ______.
The sea water contains water beetles, tadpole, fish and weeds.
Which organism is a secondary consumer?
Give one example of a food chain having four organisms. Below each organism write the three appropriate terms from the part (a) above which you think it represents.
Fill in the following blank with suitable word :
Pesticides enter the food chain at the ...........level
Which common pesticide has accumulated in human body in considerable amounts?
What percentage of sun's energy falling on the leaves of green plants is utilised by the plants in the process of photosynthesis and stored as chemical energy of food?
(a) 99 per cent
(b) 10 per cent
(c) 1 per cent
(d) 20 per cent
The surface of water in a lake appears green due to a layer of tiny free-floating organisms X on its surface. The lake water also contains organisms like water beetle, fish and tadpole. The sun shines over the lake water and provides energy for the functioning of this lake ecosystem.
(a) What could organisms X be?
(b) Write a food chain comprising of all the four organisms mentioned.
(c) What is the general name of the food chains like the one written above?
(d) Name (i) secondary consumer (ii) producer (iii) tertiary consumer, and (iv) primary consumer, in the above food chain.
(e) If the tertiary consumer gets 0.2 J of energy from the secondary consumer, then how much energy was radiated by the sun to the producer?
What are decomposers? What will be the consequence if the decomposers are completely eradicated from an ecosystem? Give justification in support of your answer.
The process of accumulation of harmful chemical substances like pesticides, in the body of living organisms at each trophic level of a food chain is known as ______.
Each level in the food chain is called a ______ level.
Use of several pesticides which results in excessive accumulation of pesticides in rivers of ponds, is a matter of deep concern. Justify this statement.
