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प्रश्न
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?
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उत्तर
Yes. Depending on the trophic level, various organisms will be affected differently if all of them are eliminated. For instance, eliminating all of the producers (T1) will negatively impact both herbivores and carnivores as well as all other consumer types, whereas eliminating all of the herbivores will negatively impact only the carnivores while increasing the number of producers.
No. The removal of any organism at any trophic level will always have a negative impact on the ecosystem. For example, eliminating tigers and lions, two of the top carnivores will quickly increase the number of deer, which will then quickly consume the available vegetation, leading to a shortage of vegetation and a deer population crash.
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संबंधित प्रश्न
What name has been given to those organisms which break down the complex organic compounds present in dead animals and plants?
Which of the following belong to the same trophic level?
Tree ; Frog ; Snake ; Grass ; Lizard
Fill in the following blank with suitable word :
Decomposer organisms are..........in their action.
What is meant by a primary consumer?
At which trophic level a person is feeding when he is eating fish.
The following is a food chain that ends with human :
Do you think that the food chain given in this question can really be regarded as a food chain? Explain your answer.
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A food chain occurring in the sea which provides food for many people can be written as: phytoplankton → zooplankton → X → Y |
- Name one phytoplankton.
- Name two zooplanktons.
- What could be Х?
- Name the organism which Y could be.
- Which organism in the above food chain is a (i) primary consumer, and (ii) tertiary consumer?
In a food chain consisting of grass, frog, bird and insects, where will the concentration of the harmful chemicals be maximum?
'If we excessively use pesticides to protect the crops from diseases, then it may cause long-term damage to mankind'. Justify this statement.
Explain why, a food chain usually cannot have more than three or four steps.
If the energy available at the producer level in a food chain is 150 J, how much energy will be transferred to : tertiary consumer?
(a) 15 J
(b) 10 J
(c) 1.50 J
(d) 0.15 J
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?
A forest ecosystem having a lot of green plants has some foxes, lions and rabbits in it.
(a) Write a food chain comprising all the four organisms mentioned above.
(b) Name (i) one herbivore, and (ii) two carnivores, in this food chain.
(c) Name the link which is a predator as well as a prey.
(d) Name (i) second trophic level, and (ii) third trophic level.
(e) Which link of this food chain can feed on second trophic level as well as third trophic level, independently?
(f) If the sun provides 1000 J of energy to the plants, then how much energy will be transferred to fox through the food chain.
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.
Which organism will have the maximum amount of pesticides accumulated through the food chain? What is this process known as?
In an ecosystem, herbivores represent ______.
In the given food chain, suppose the amount of energy at the fourth trophic level is 5 kJ, what will be the energy available at the producer level?
Grass → Grasshopper → Frog → Snake → Hawk
Primary consumers are characterized as:
Quaternary consumers are described as:
If a secondary consumer receives 100 units of energy from primary consumers, how much energy approximately originated from the producers?
