When the earth was formed it had an atmosphere with

A. Hydrogen, Oxygen and Nitrogen

B. Water Vapour, Hydrogen and Oxygen

C. Oxygen, Carbondioxide and Nitrogen

D. Water Vapour, Ammonia and Methane

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  1. Which of the following organelles is known as the 'power House' of the cell?
  2. What do you mean by lentic biota?
  3. The pH of normal urine of man ranges from
  4. The term 'Fauna' means
  5. Green plants synthesise carbohydrates by the
  6. A child goes on vomiting profusely and develops symptoms of diarrhoea. Chances are that in the child's…
  7. The enzyme that is necessary to bring about clotting of blood is
  8. The acid that is secreted in the stomach is
  9. Which of the following plays an important part in photosynthesis?
  10. Which among the following is not a degenerative disease?
  11. Leaves Call off branches In the winter because of
  12. Antisnake venom is prepared by
  13. The natural defence of our body against foreign germs is formed by
  14. The saliva contains an enzyme called
  15. Which among the following is a communicable disease?
  16. The study of ecology with pyramids was invented by
  17. Which one of the endocrine glands disappears after puberty?
  18. A person with a blood group ____ is considered to be an universal donor.
  19. In case of a heart attack a hormone is injected as an emergency measure. Which one is it?
  20. Best growth of plants is attained if they are supplied with
  21. Which of the following diseases is not caused by a virus?
  22. Necrosis is a symptom which is recognised by
  23. Loss of blood is minimized due to blood
  24. The smallest size of a cell which can be seen directly by the eye is
  25. Vessels proceeding to the heart are
  26. Which among the following is a Cast growing tree?
  27. The blood of cockroach shows the following characteristics except one. Mark it.
  28. Which among the following may carry rabies?
  29. Diabetes is a disease which is
  30. Whale reproduces by