Water 1. How many of the following statement/s is/are correct I. At room temperature ice melts and is a spontaneous processII. Melting of ice and evaporation of water at room temperature has a negative ΔG III. Melting of ice and evaporation at room temperature are not spontaneous processes I II III All None 2. What makes water crucial for life on earth? Ability to ionise Ability to freeze Attract other water molecules A&C None 3. Hydrogen bonds can only be formed between H and OH of the water molecule? False True None 4. Which of the following is not the strategy to transport the insoluble gases into the biological system Using an alternative gas Use of carrier proteins Chemical modification of the gaseous form All of the above. None 5. A polysaccharide of 1000 glucose molecules has same effect on osmolarity as a milligram of the monomer. True False None 6. Which of the following phenomenon does not contribute to the mechanical strength of the plant body? Acquisition of the high solute concentration in the vacuole Pressure exerted by the swelling of the cell on the non-expansing cell wall Both I&II None 7. Which of the following is true? Structure of water molecule is not a perfect tetrahedron because of the crowding by nonbonding orbitals of the oxygen atom Shape of a water molecule is a perfect tetrahedron with H-O-H angle of 109.5° None 8. Which of the following property of water is not attributed to hydrogen bonds? It imparts a strong cohesive force It makes water a polar compound It helps in interaction of large biomolecules without any physical interaction It leads to the expansion of volume of the water when cooled below 4°C None 9. The importance of hydrogen bonds in biology is/are that, They are essential in the formation of the three dimension structures of the protein and other biomolecules High heat capacity of the water due hydrogen bonding confers resistant to sudden temperature changes in the body of the organism Formation of the stable cell membranes in aquatic solutions. All of the above None of the above None 10. Which is true about biologically important gases? N2, O2 and Co2 are the biologically important gases They are non polar Movement of them from gaseous phase to aqueous phase decrease the entropy All of the above None Time's up
