NCERT Solution for Class 10 Science Chapter 15
Our Environment,
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-265
Questions No-5
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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Yes, the impact of removing all organisms in a trophic level will be different for different trophic levels. If all the producers are killed, it will cause death or migration of the primary consumers in the ecosystem. In the absence of producers, subsequent level of consumers will also be affected. But if primary consumers are removed, organisms of higher trophic level will die, while those of lower level (producers) show exponential growth much beyond the carrying capacity of the environment. Removal of the organisms in a trophic level will upset the whole ecosystem as all categories of organisms are linked through food chain. The survival of organisms of one trophic level depends on the existence of the members of other trophic level.
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Yes, the impact of removing all the organisms in a trophic level will be different
for different trophic levels. For example, on removing producers; herbivores would not
be able to survive or they would migrate and ecosystem would collapse. If herbivores are
removed, producers would grow unchecked and carnivores would not get food. If
carnivores are removed, herbivores would increase to unsustainable levels and could
destroy the producers. If decomposers are removed, the dead animals would pile up due
to which the environment would become polluted. In addition to this, if dead animals
will not decompose, the recycling of nutrients in the soil will be stopped and its fertility
will be reduced. As a result the green cover of the earth will be lost. Thus to maintain the
balance of the ecosystem the presence of organisms is necessary at each trophic level.
(a) Yes, the impact of removing all the organisms in a trophic level will be different for different trophic levels.
For eg : – Grass →→ Rabbit →→ Tiger :
In the above food chain : –
(i) If we remove all the tigers at the third trophic level, then the number of rabbits will increase and these rabbits will eat up all the grass and plants forest becomes desert.
(ii) If we remove all the rabbits at the second trophic level, then tigers will not get food and due to starvation they will die.
And, also the amount of grass and plants increase.
(b) No, all the organisms of any trophic level cannot be removed without causing any damage to the ecosystem.
The impact of removing all the organisms in a trophic level can indeed vary, and it’s unlikely that the removal of organisms from any trophic level would cause no damage to the ecosystem. The effects depend on the specific roles and interactions of the organisms within their trophic level and the relationships they have with organisms in other trophic levels.
Primary Producers (First Trophic Level): Removing primary producers (e.g., plants) can have cascading effects on herbivores and omnivores that rely on them for food. It can disrupt the entire food chain.
Herbivores (Second Trophic Level): Removing herbivores would impact the predators (carnivores) in the next trophic level, as they depend on herbivores as a food source.
Carnivores (Higher Trophic Levels): The removal of carnivores can affect the balance of prey populations, leading to population explosions of certain species and declines in others.
In general, ecosystems are complex and interconnected, and the removal of any trophic level is likely to have consequences throughout the system. While some organisms might be more resilient or adaptable to changes, completely removing any trophic level is likely to disrupt the delicate balance of the ecosystem and have negative consequences.
It’s a bit like playing Jenga – removing one piece can cause the whole tower to become unstable!