Home
Class 9
BIOLOGY
There is mass mortality of fishes in a p...

There is mass mortality of fishes in a pond. What may be the reasons?

Text Solution

AI Generated Solution

**Step-by-Step Solution:** 1. **Identify the Problem**: The question states that there is mass mortality of fishes in a pond. This indicates a significant number of fish are dying in a short period. 2. **Consider Possible Causes**: One of the primary causes of mass mortality in aquatic environments is water pollution. 3. **Understand Water Pollution**: Water pollution occurs when harmful substances or pollutants enter the water body. These pollutants can come from various sources such as industrial waste, agricultural runoff, sewage discharge, etc. ...
Promotional Banner

Topper's Solved these Questions

  • NATURAL RESOURCES

    NCERT EXEMPLAR ENGLISH|Exercise Long Answer Type Questions|7 Videos

  • NATURAL RESOURCES

    NCERT EXEMPLAR ENGLISH|Exercise Long Answer Type Questions|7 Videos

  • IMPROVEMENT IN FOOD RESOURCES

    NCERT EXEMPLAR ENGLISH|Exercise Short Answer Questions|21 Videos

  • THE FUNDAMENTAL UNIT OF LIFE

    NCERT EXEMPLAR ENGLISH|Exercise Long Answer Type Questions|7 Videos

Similar Questions

Explore conceptually related problems

A lake near a village suffered heavy mortality of fishes within a few days Consider the following reasons for this? (a) Lots of urea and phosphate fertilizers were used in the crops in the vicinity. (b) The area was sprayed with DDT by an aircraft. (c) The lake water turned green and stinky. (d) Phytoplankton population in the lake declined initially thereby greatly reducing photosynthesis. Which two of the above were the main causes of fish mortality in the lake?

During winter a person died during sleep, the room was closed and a container with burnt charcoal was found in the room. What may be the possible reason of his death ?

A boat containing some piece of material is floating in a pond. What will happen to the level of water in the pond if on unloading the pieces in the pond, the piece (a) floats, (b) sinks?

The sudden mass killing of fishes is likely to be seen in a :

Scholars caught marked and released 80 fishes in a pond. Later 100 fishes were caught at random. 40 of them were marked. The number of fishes in the pond is

In a population of an area, the difference in the natality rate and mortality rate is zero in a particular year, but the population density has decreased. Which of the following may be the reason for this decrease ?

In a population of an area, natality was equal to mortality for a given time equal to mortality for a given time period. However, the population density of the population increased, which of the following may be the reason for the increases ?

A bird is flying up at an angle sin^(-1)(3//5) with the horizontal. A fish in a pond looks at that bird when it is vertically above the fish. The angle at which the bird appears to fly (to the fish) is [mu_(w) = 4//3]

Assertion (A) : Amphibians have evolved from fishes . Reason (R ) : Archaeopteryx is a fossil linking fishes and amphibians (a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion. (b) If both Assertion and Reason are true ,but the Reason is not the correct explanation of the Assertion. (c) If Assertion is true, but Reason is false (d) If both Assertion and Reason are false.

Assertion : In a free fall, the initial velocity of a body may or may not be zero. Reason : A heavy body falls at a faster rate as compared to a light body.

NCERT EXEMPLAR ENGLISH-NATURAL RESOURCES -Short Answer Type Questions
  1. Rivers from land, add minerals to sea water. Discuss how ?

    Text Solution

    |

  2. How can we prevent the loss of top soil?

    Text Solution

    |

  3. How is the life of organisms living in water affected when water gets ...

    Text Solution

    |

  4. During summer, if you go near the lake, you feel relief from the heat,...

    Text Solution

    |

  5. In coastal area, wind current moves from the sea towards the land duri...

    Text Solution

    |

  6. Following are a few organisms Which among the above can grow on stone...

    Text Solution

    |

  7. Soil formation is done by both abiotic factors. List the names of thes...

    Text Solution

    |

  8. All the living organisms are basically made up of C,N,S,P,H and O, . H...

    Text Solution

    |

  9. Why does the percentage of gases like oxygen, nitrogen and carbon diox...

    Text Solution

    |

  10. Why does moon have very cold and very hot temperature variations e.g.,...

    Text Solution

    |

  11. Why do people love to fly kites near the seashore ?

    Text Solution

    |

  12. Why does Mathura refinery pose problems to the Taj Mahal?

    Text Solution

    |

  13. Why do not lichens occur in Delhi whereas they commonly grown in Manal...

    Text Solution

    |

  14. Why does water need conservation even though large oceans surround the...

    Text Solution

    |

  15. There is mass mortality of fishes in a pond. What may be the reasons?

    Text Solution

    |

  16. Lichens are called pioneer colonisers of bare rock. How can they help ...

    Text Solution

    |

  17. Soil is formed by water'. If you agree to this statements then give re...

    Text Solution

    |

  18. Fertile soil has lots of humus. Why?

    Text Solution

    |

  19. Why step farming is common in hills?

    Text Solution

    |