SL/HL Topic D2.3 Water potential - 无忧得胜-网上国际课程 (5edu.win)

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1#

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1. Why is water a good,1o7 ;,eb,mq v+d:oes li b8qalfj od.fm3e4u solvent of ionic substances?

A. Positive ions are attracted to the hydrogen atom in water.

B. Negative and positive ions are attracted to the oxygen atom in water.

C. Negative ions are attracted to the covalent bonds in water.

D. Negative and positive ions are attracted to polar water molecules.

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2#

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2. In which conditions will the dh:25 kkof9kyre be a net movement of water molecules by osmosis from cell X tofohkk2kd 9:5y cell Y?

A. B. C. D.

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3#

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3. Predict what would hz3n dlo p h)d(qsv.1y;appen if a eukaryotic animal cell was bathed in a hypertonic solutiyzpd3)s ;qdnl.h1o(v on.

A. It will shrink.

B. It will expand.

C. It will burst.

D. It will remain the same

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4#

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4. An organ for transplad:r ct)u7be 5av b-o-dnt is bathed in a cooled liquid to be transported to the operating theatre patient. What-5d) :bv dboreu-ct7a should be a property of this liquid?

A. It is hypotonic to body fluids.

B. It is isotonic to body fluids in glucose concentration.

C. It is hypertonic to body fluids.

D. It is isotonic to body fluids in solute concentration.

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5#

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5. Osmosis is the movement of water moleculel*o rmr 7c 2l-1jy,ncmgvfvois1 yr 4*5(mjc1s across a membrane. It requires a membrane in order toogc1, irj7m( 5j- s1l4rc 2v1m lfvyc**mrny o:

A. Maintain the water potential across the membrane.

B. Provide protein pumps for water movement.

C. Allow solute movement out of the cell.

D. Provide energy to drive osmosis.

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6#

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6. The graph below represents the mass change of ten potato tuber “chips” in distilled water (blue) and ten potato chips in 15% sucrose (red) measured every 10 minutes for 60 minutes.The chips were all cylinders of 50 mm length and 10 mm diameter. Before each measurement, the chips were dried carefully. After measurements were taken, they were replaced in the correct solution. The length of the chips at 0, 20, 40 and 60 minutes were also measured.

a. Calculate the percentage loss i) i( p7yxvv1v0ox, 29bw xbzmxn mean mass of the potato chips in 15% sucrose after 20 minutes of thbxbovm),wy 0x72 9(z vxv x1ipe experiment.

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7#

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6. The graph below represents the mass change of ten potato tuber “chips” in distilled water (blue) and ten potato chips in 15% sucrose (red) measured every 10 minutes for 60 minutes.The chips were all cylinders of 50 mm length and 10 mm diameter. Before each measurement, the chips were dried carefully. After measurements were taken, they were replaced in the correct solution. The length of the chips at 0, 20, 40 and 60 minutes were also measured.

b. Explain why the potato chips in 15% sucrose lost ma 0wr12p sg:+myvhxelsjy4 q4 ;kf0k:yss.

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8#

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6. The graph below represents the mass change of ten potato tuber “chips” in distilled water (blue) and ten potato chips in 15% sucrose (red) measured every 10 minutes for 60 minutes.The chips were all cylinders of 50 mm length and 10 mm diameter. Before each measurement, the chips were dried carefully. After measurements were taken, they were replaced in the correct solution. The length of the chips at 0, 20, 40 and 60 minutes were also measured.

c. State two other variabl,febbec : 2ik+es that must be controlled to give valid results in this experiment.fbi,:2 c+ebke

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9#

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6. The graph below represents the mass change of ten potato tuber “chips” in distilled water (blue) and ten potato chips in 15% sucrose (red) measured every 10 minutes for 60 minutes.The chips were all cylinders of 50 mm length and 10 mm diameter. Before each measurement, the chips were dried carefully. After measurements were taken, they were replaced in the correct solution. The length of the chips at 0, 20, 40 and 60 minutes were also measured.

d. The uncertainty of the massx( rze uvh3,;o xxnoe-3-h6b n and of the time are shown. Suggest how these uncertainties could be sh oo3-bnx x3 u;en,eh-r6xhz(vown on the trend lines.

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10#

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6. The graph below represents the mass change of ten potato tuber “chips” in distilled water (blue) and ten potato chips in 15% sucrose (red) measured every 10 minutes for 60 minutes.The chips were all cylinders of 50 mm length and 10 mm diameter. Before each measurement, the chips were dried carefully. After measurements were taken, they were replaced in the correct solution. The length of the chips at 0, 20, 40 and 60 minutes were also measured.

e. Explain why measurements wc (1ua ih0ense. ox0o8ere taken until the $60^{th}$ minute.

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11#

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6. The graph below represents the mass change of ten potato tuber “chips” in distilled water (blue) and ten potato chips in 15% sucrose (red) measured every 10 minutes for 60 minutes.The chips were all cylinders of 50 mm length and 10 mm diameter. Before each measurement, the chips were dried carefully. After measurements were taken, they were replaced in the correct solution. The length of the chips at 0, 20, 40 and 60 minutes were also measured.

f. Suggest why 10 chips weh xs659bav 6 ;,,qqarn dfqmt8re used in each concentration.

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12#

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6. The graph below represents the mass change of ten potato tuber “chips” in distilled water (blue) and ten potato chips in 15% sucrose (red) measured every 10 minutes for 60 minutes.The chips were all cylinders of 50 mm length and 10 mm diameter. Before each measurement, the chips were dried carefully. After measurements were taken, they were replaced in the correct solution. The length of the chips at 0, 20, 40 and 60 minutes were also measured.

g. The mean length of the potato chi en.c60dto 6/t yt9mbzyg) 5dxytw7 m+ps were also measured and the data is presented in the table belowno6+/md9g 5y zm.)x0cybe td w tytt76

Use the data in the graph and the table to discuss whether the measurement of length or of mass would give greater validity to the results.

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13#

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第 3 题组 (共 3 题 3 分)

7. Outline the movement of water bfx ddcp- e37o8etween two cells with equal concentrations of sod8- oedx3fcp7lutes.

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14#

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8. Halophytes are plants which live in areas of high salt concentraaz:: +gq8iq s4+vjx oitions. Explain why these plants have ion transpoqvox: i 8+z+sgai :4qjrt pumps in the membranes of their root hair cells.

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15#

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9. A plant has not been watered for a few days. Explain the changesuiqm)34ilmw(9s(v hq9 2hs wh that occur in the water potential of one of its cells when it is(9h4sq iw)l mu(9vqi2s mw3h h bathed in distilled water.

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