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प्रश्न
There is mass mortality of fishes in a pond. What may be the reasons?
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उत्तर
The possible reasons can be:
- thermal pollution.
- addition of harmful compounds such as mercury to water.
- obstruction of fish gills by any water pollutant.
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संबंधित प्रश्न
Make sketch of hydrological cycle in nature.
Water cycle controls Earth‛s temperature.
Describe the processes involved in the water cycle.
State for the following whether it is due to evaporation or condensation:
Steam rising from a hot girdle when water is sprinkled on it.
Each day, we lose a little more than a cup of water when we ______.
In plants, the loss of water in the form of vapour from the aerial parts through ______.
The water vapour gets cooled and changes into tiny water droplets that form ______ in the sky.
Paheli wrote a food chain in the following way:
frog → eagle → insects → grass → snake
The chain is not in the correct order. Help her to write the food chain correctly.
Water kept in sunlight gets heat from sun and is evaporated. But how does water kept under the shade of a tree also gets evaporated? Explain.
Assertion (A): Biosphere is a dynamic and stable system.
Reason (R): There is a constant interaction between biotic and abiotic components in the biosphere.
