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Strontium- 90 can cause

A. lung diseases

B. bone cancer

C. leukaemia

D. skin cancer

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  1. The transitional zone where two different types of communities meet is called the
  2. Species that occur in different geographical regions separated by special barriers are
  3. Which of the following is normally not an important atmospheric pollutant
  4. The soils transported by water are called
  5. The source of energy in an ecosystem is
  6. Which is the correct sequence in a food-chain
  7. Ultra-violet radiation from sunlight causes the reaction that produce
  8. The main cause of soil erosion in India is
  9. Gas liberated in Bhopal gas tragedy was
  10. Trophic levels are formed by
  11. In a food-chain, the saprophytic organisms are
  12. Bio tic factors are
  13. A pond is
  14. A food-chain consists of
  15. Animals which live at the bottom of the sea are called
  16. The energy storage of consumer level is called
  17. An organism which lives at the expense of another organism is called
  18. Association of a sea-anemone with hermit crab living in a gastropod shell is an example of
  19. Synecology is the study of
  20. Which of the following atmospheric pollutants is not produced by the exhaust of motor vehicles in Delhi
  21. Desert animals are called
  22. Smog is a combination of
  23. The total interacting animals and plants in any well defined area which as field or a pond is known…
  24. Synecology is the study of
  25. Which one is the direct ecological factor ?
  26. In an ecosystem the population of
  27. Strontium- 90 can cause
  28. When compared to the trophic level above, the total energy present in any given trophic level is necessarily
  29. Animals in cold regions have fur because
  30. The most widespread form of symbiosis in nature is