For items 23-24, refer to this experimental set- up Two solutions of the differe
ID: 301129 • Letter: F
Question
For items 23-24, refer to this experimental set- up Two solutions of the different salt concentrations (X and Y) are enclosed in bags made of a differentially membrane. Both are immersed in a 0.5% salt solution. 0.3% salt -.... ^.- 0.7% salt 0.5% salt 23. Water molecules will move fromm a. X to Z and Z to Y b. Z to X and Y to Z c. Z to both X and Y d. X and Y to Z 24. After enough time has elapsed, the salt concentration in Z will be a. the same as X and Y b. greater than X and less than Y c. greater than Y and less than X d. greater than either Y or X 25. An input of energy is required for which of the following? a. diffusion b. osmosis c. facilitated diffusion d. active transport 26. Which of the following reactions show the transfer of energy to living organisms? C. A B+C AB d. AB A +B+C b. AB A +BExplanation / Answer
23. bag X has 0.3% salt solution and Y has 0.7% salt solution. The solution (Z) in which these bags are immersed has 0.5% salt solution. During osmosis water moves from a region of low solute concentration to a region of high solute concentration. Water will move from X (0.3%) to Z (0.5%) and from Z (0.5%) to Y (0.7%)
24. The salt concentration in Z will be same as X and Y. The process of osmosis tries to equalize the salt concentration in all the 3 compartment i.e bag X,Y and Z.
25. Diffusion,faciliated diffusion and osmosis do not input energy as these process move molecules down the concentration gradient. Active transport involves movement of solute against concentration gradient and require energy from ATP.
26. Equation A + B = AB shows transfer of energy to living system . For example: during photo synthesis CO2 and H2O combine to form glucose molecules in presence of light energy. light energy is ultimately stored in glucose molecule.
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