Environmental Issues

Environmental Issues

Easy Questions
Moderate Questions

Advanced Botany

Plant Growth and Development
Organisms and Populations
Ecosystem
Biodiversity and Conservation
Environmental Issues
Microbes in Human Welfare
Strategies for Enhancement in Food Production
Molecular Basis of Inheritance
Principles of Inheritance and Variation
Sexual Reproduction in Flowering Plants
Reproduction in Organisms
The Living World
Respiration in Plants
Photosynthesis
Mineral Nutrition
Transport in Plants
Cell Cycle and Cell Division
Cell-The Unit of Life
Anatomy of Flowering Plants
Morphology of Flowering Plants
Plant Kingdom
Biological Classification
  1. In an area where DDT had been used extensively, the population of birds declined significantly because:








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    High concentration of DDT disturbs calcium metabolism in birds which caused thinning of eggshell and their premature breaking.

    Correct Option: D

    High concentration of DDT disturbs calcium metabolism in birds which caused thinning of eggshell and their premature breaking.

  1. Eutrophication of water bodies leading to killing of fishes is mainly due to nonavailability of:








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    Due to eutrophication, water bodies lack oxygen causing death of aquatic life.

    Correct Option: C

    Due to eutrophication, water bodies lack oxygen causing death of aquatic life.

  1. High value of BOD (Biochemical Oxygen Demand) indicates that:








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    BOD (Biochemical Oxygen Demand) is a method which measures the level of water pollution. The polluted water has bacteria and many other microorganisms which consume the dissolved oxygen of water. The higher the BOD, the lower would be the dissolved oxygen in polluted water. The high value of BOD indicates the highly polluted water.

    Correct Option: A

    BOD (Biochemical Oxygen Demand) is a method which measures the level of water pollution. The polluted water has bacteria and many other microorganisms which consume the dissolved oxygen of water. The higher the BOD, the lower would be the dissolved oxygen in polluted water. The high value of BOD indicates the highly polluted water.

  1. A river with an inflow of domestic sewage rich in organic waste may result in








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    Domestic sewage rich in organic waste leads to increase in Biological Oxygen Demand, which leads to decrease D.O. (dissolved oxygen) which leads to death of fishes.

    Correct Option: D

    Domestic sewage rich in organic waste leads to increase in Biological Oxygen Demand, which leads to decrease D.O. (dissolved oxygen) which leads to death of fishes.

  1. Major aerosol pollutant in jet plane emission is








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    Fluorides of carbon is the major pollutant from jet plane emission.

    Correct Option: D

    Fluorides of carbon is the major pollutant from jet plane emission.