The major ingredient of leather is

A. Nucleic acid

B. Carbohydrate

C. Collagen

D. Polymer

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  1. Cell membrane is
  2. Earth's seasons are caused by which of the following?
  3. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  4. The metal used in storage batteries
  5. The solar eclipse occurs when
  6. In an atomic nucleus, neutrons and protons are held together by
  7. Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
  8. In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If…
  9. The intencity of Earthquakes is measured on
  10. Which of the following elements is obtained from sea weeds ?
  11. The formula of Plaster of Paris is
  12. Polythene is industrially prepared by the polymerisation of
  13. Bromine is
  14. Rust is
  15. Liquefied Petroleum gas (LPG) consists of mainly
  16. The type of glass used in making prisms and lenses is
  17. The accumulation of stress along the boundaries of lithospheric plates results in which of the following?
  18. Glass is made from the mixture of
  19. The marine animal called dugong which is vulnerable to extinction is a/an
  20. When a gas is turned into a liquid, the process is called
  21. Apparatus invented by Archimedes is :
  22. The fastest-running terrestrial animal is
  23. Nitrification means
  24. The fastest acting enzyme in the biological kingdom is
  25. One fathom is equal to
  26. The hardest substance available on earth is
  27. Which of the following parts of the sun is easily visible only during a total solar eclipse?
  28. Which of the following elements is a metal
  29. The oxide of Nitrogen used in medicine as anaesthetic is
  30. The Panda belongs to the same family as that of