MCQs-Biology-Evolution and biochemistry multiple choice questions 1. Which of the following is TRUE about the statements A and B? A. Upto >99% weight of the living organism is made of H, O, N and C. B. They form more stable covalent bonds with other elements Statement A is true and Statement B is an explanation Statement A and B are false Statement A and B are true but statement B is not the explanation of A Statement A is true and statement B is false None 2. The common point between silicon and carbon is Both elements have valency of 4 Both elements have same bond energies Oxidation products of both the elements are soluble in water Both elements can form stable covalent bond in presence of water. None 3. Which of the following property of the carbon is advantageous for life on earth? It can form long chain carbon compounds It can form ring structured compounds It forms stable covalent bonds with other elements All of the above None of the above None 4. Polymers of the silicon, Don't form Are stable only at high temperature in water Are unstable in the presence of water Can support the life by forming long chain polymers. None 5. Which of the following defines the process of respiration The process of synthesis of oxygen from the splitting of two H2O molecules The transfer of electron to O2 by other energy yielding molecules Transfer of electron to any molecule with the emission of energy The process of oxidation through fermentation None 6. Water is present in abundant quantity in all the living organism and the reason is, Polarity and hydrogen bond forming ability of the water Size of the molecule Tetrahedral structure of the molecule None of the above None 7. Which of the following is TRUE? >99% mass of the living matter is formed of H,O,N and C All the elements from periodic table are essential for the life on earth Only about 30 elements from periodic table participate in the making of life on earth 1 & 3 1 & 2 None 8. Carbon element, Has atomic number of six Has atomic mass of 12 Is considered as a standard in determining the atomic mass All of the above None of the above None 9. Which of the following elements make >99% of the dry living matter? H,O,N , C H, C, S, N H, N, Ca, Na C, N, H, Na None 10. What is TRUE about the covalent bonds of silicon and carbon C-C covalent bonds are stronger than Si-Si bonds Si-Si covalent bonds are stronger than C-C bonds C-C covalent bonds are stable than Si-Si bonds C-C covalent bond has high bond energy than Si-Si- bonds All of the above 1 & 4 None 11. Majority volume of the living body is occupied by Carbon Water Empty spaces called as vacuoles None of the above None 12. Most polymeric molecules are thermodynamically unstable but kinetically stable. True False None 13. Approximate time since the emergence of life on earth is, 4.5 billion years 3.5 billion years 20000 years 3.5 million years None 14. Which of the following trace element isn’t found in any living organism on earth? Fe Co Cu Tc None 15. Why carbon is present in most of the biochemicals? It is abundant in the environment It is the most suitable element for biomolecule formation because of its unique chemical properties All the carbon containing compounds have low activation energy thereby speeding up the reactions Other elements preferentially react with carbon None Please fill in the comment box below. Time's up
