Home
Class 12
BIOLOGY
A biologist studied the population of ra...

A biologist studied the population of rats in a barn . He found that the average natality was 250, average mortality 240, immigration 30. the net increase in population is

A

100

B

15

C

5

D

Zero

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • DO YOU KNOW QUESTIONS

    SARAS PUBLICATION|Exercise EXERCISE|102 Videos

  • ECONOMICALLY USEFUL PLANTS AND ENTREPRENEURIAL BOTANY

    SARAS PUBLICATION|Exercise EXERCISE|19 Videos

Similar Questions

Explore conceptually related problems

Density of population in a given during a gi ven period fluctuates due to changes in four basic processer natality mortality immigration and emigration. a. Differntate natality and mortality b. Differentiate immigration and emigration

A town has a population of 1 million. The average electric power needed per person is 300W. A reactor is to be designed to supply power to this town. The efficiency with which thermal power is converted into electric power is aimed at 25%.(a) Assuming 200 MeV of thermal energy to come form each fission event on an average, find the number of events on an place every day. (b) Assuming the fission to take place largely through U^235 , at what rate will the amount of U^235 decrease ? Express uour answer in kg per day. (c) Assuming that uranium enriched to 3% in U^235 will be used, how much uranium is needed per month (30 days)?

SARAS PUBLICATION-ECOLOGY AND ENVIRONMANT-EXAMPLE
  1. Secondary productivity is rate of formation of new organic matter by

    Text Solution

    |

  2. During sewage treatment biogas produced includes:

    Text Solution

    |

  3. A biologist studied the population of rats in a barn . He found that t...

    Text Solution

    |

  4. Which one of the following processes during decomposition is correctly...

    Text Solution

    |

  5. Global warming can be controlled by

    Text Solution

    |

  6. The Prevention and Control of Air Pollution Act came into force in

    Text Solution

    |

  7. Benthic organisms are affected most by

    Text Solution

    |

  8. The largest tiger reserve in India is

    Text Solution

    |

  9. Which one of the following is a primary consumer in maize field ecosys...

    Text Solution

    |

  10. The important steps in the process of decomposition are

    Text Solution

    |

  11. What is the main source of energy for all ecosystem on earth?

    Text Solution

    |

  12. Dinosaurs dominated The world in which of the following geological era...

    Text Solution

    |

  13. The age pyramid with broad base indicates

    Text Solution

    |

  14. Which one of the following is a metal?

    Text Solution

    |

  15. Climate of the world threatened by

    Text Solution

    |

  16. Which one of the following is an example of ex-situ conservation?

    Text Solution

    |

  17. A location with luxuriant growth of lichens on the trees indicates tha...

    Text Solution

    |

  18. Match the following and select the correct option:

    Text Solution

    |

  19. Given is a simplified model of phosphorus cycling in a terrestrial eco...

    Text Solution

    |

  20. A species facing extremely high risk of extinction in the immediate fu...

    Text Solution

    |