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प्रश्न
We do not clean natural ponds or lakes but an aquarium needs to be cleaned regularly. Why is it so ? Explain.
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उत्तर
Aquarium is an artificial ecosystem that contains fishes as living organisms. In natural ecosystems, other organisms are also present in sufficient number to maintain a balance. In natural aquatic ecosystem, uneaten food or fish waste turns into ammonia and then bacteria convert these pollutants into non-toxic “nitrates”. Therefore, if the water of aquarium is not changed regularly, then wastes could accumulate to dangerous level, which can lead to the death of fishes.
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संबंधित प्रश्न
List two important roles play in the environment by decomposers.
Name one decomposer.
Write one or two word for the following statement/definition :
Each level of food chain where transfer of energy takes place
Which of the following is not a producer?
(a) grass
(b) zooplankton
(c) phytoplankton
(d) paddy
What provides the energy which then flows through a food chain?
(a) glucose
(b) oxygen
(c) respiration
(d) sunlight
Arrange the following in a correct sequence and form a food chain
Human → Insect → Algae → Fish
Give some examples for Biodegradable and Non-biodegradable waste.
| S. No. | Biodegradable waste | Non-biodegradable waste |
| 1. | Food Waste | Plastic Bottles |
| 2. | ||
| 3. | ||
| 4. | ||
| 5. |
In a given food chain if the amount of energy at the fourth trophic level is 6 kJ, what will be the energy available at the producer level?
If a harmful chemical enters a food chain comprising peacocks, plants, rats and snakes, which of these organisms is likely to have the highest concentration of the chemical in its body? Justify your answer. Name the process involved and define it.
Use of several pesticides which results in excessive accumulation of pesticides in rivers of ponds, is a matter of deep concern. Justify this statement.
