Options:
A. One that gets destroyed quickly
B. One that can maintain balance over time
C. One that depends only on humans
D. One without living organisms
Correct Option: B
Explanation: A sustainable ecosystem is one that can maintain its balance and continue to function properly over a long period of time. It includes living things like plants, animals, and microorganisms, as well as non-living components like air, water, and soil. All these elements work together in harmony.
In a sustainable ecosystem, resources are used carefully so that they are not completely exhausted. For example, trees grow, animals feed, and nutrients cycle naturally. This balance ensures that future generations can also benefit from the same resources.
Forests are a good example of sustainable ecosystems. They support wildlife, produce oxygen, and maintain climate balance. If humans cut too many trees or pollute the environment, the ecosystem becomes disturbed and may no longer remain sustainable.
Human activities play an important role in maintaining sustainability. Practices like recycling, conserving water, and reducing pollution help protect ecosystems.
Students should understand that sustainability is not just about nature but also about responsible behavior. A sustainable ecosystem supports life continuously without harming the environment.
So, a sustainable ecosystem is one that remains balanced, supports life, and uses resources wisely over time.