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प्रश्न
What will happen if we kill all the organisms in one trophic level?
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उत्तर १
If we kill all the organisms at one trophic level, it will create an imbalance in the ecosystem. For example, in a food chain, Grass → Deer → Lion, if we remove all lions, then the population of deer will increase, which will cause overgrazing. This will lead to deforestation. It may even lead to soil erosion, causing the further conversion of fertile land into barren deserts.
उत्तर २
If we kill all the organisms in one trophic level, the transfer of food energy to the next trophic level will stop. This will cause a break in the food chain, resulting in an imbalance in the ecosystem. As a result, the organisms of the higher trophic level will also die, while the individuals of the lower trophic level will exhibit enormous growth in their population. Both conditions will result in an ecological upset.
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संबंधित प्रश्न
Give reason to justify the following: The existence of decomposers is essential in a biosphere.
List two important roles play in the environment by decomposers.
Define decomposers.
What is meant by a primary consumer, secondary consumer and a tertiary consumer? Give one example of each.
Write down a food chain with five links in it.
At which trophic level a person is feeding when he is eating fish.
Which of the following are decomposers of dead organisms?
| Bacteria | Fungi | Viruses |
| (a) no | yes | yes |
| (b) yes | no | yes |
| (c) yes | yes | no |
| (d) yes | yes | yes |
One of the following is not a consumer. This one is :
(a) giraffe
(b) antelope
(c) algae
(d) alligator
The following is a food chain that ends with human :
plants → bee → human
Explain how plants provide food for bees.
Explain why, a food chain usually cannot have more than three or four steps.
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
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.
(a) In which organisms the pesticides enter from the polluted water? What is this level of organisms known as?
What are decomposers? What will be the consequence if the decomposers are completely eradicated from an ecosystem? Give justification in support of your answer.
Arrange the following in a correct sequence and form a food chain
Rabbit → Carrot → Eagle → Snake
The sequence of who eats whom in an ecosystem is called as ______.
The food chain begins with the energy given by the ______.
Analogy:
Primary Consumer: Goat, Cow:: Secondary Consumer: ______.
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.
