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 go3fbhs..s6 0zmjfz e7bod 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 w4oi0 23 vqxdb rnm3)fzxnwk ,-ill there be a net movement of water molecules by osmosis from i dnq3fxw4-v xkr mob3z 2)n0,cell X to cell Y?

A. B. C. D.

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3#

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3. Predict what would happen if a eukaryotic animal cell m-l 5qte2q uv,v 7xfk+was bathed in a hypertonick 7vlu2-x +m5f tvq,qe solution.

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 transplant is bathed in8d4ne c*t 2sij)j5*q i3ienob a cooled liquid to be transported to the operati5)83 jjq* nco42n *i sbiedeting theatre patient. What 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 :hnqwaeq . (xdp3 s9yieg+5q/water molecules across a membrane. It requires a membrhda p: i/eeq9yq3 sn+(5qw x.gane in order to:

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 in mean mass of the potato chips in 15% sucro bas:3yg9d v2qse after 20 minutes of the exp9s y va3dg:2qberiment.

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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% s:f wb7c g e;b jkbph4kzs:8b6v+o :)dzucrose lost mass.

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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 variables that must be controlled to give valf ctxswi21d pb*xo)k(3 6 gxm4id results in thif i63x* sm)(ko41pbd gwcx x2ts experiment.

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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 mass pyn lhi4np:kch(323jand of the time are shown. Suggest how these uncertainties could be shonin c lk( :p4jy33hph2wn 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 were taken until hg :0 geha 8.1ty.gh1q9c)rpgai5 :hlckoxw8the $60^{th}$ 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 chipcw.bmqq (36mmq9b2 91n wwn cgs were 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 chips were also measured and the data is 0(lvjksb :2-+ajvbq-iwa v4v presented i42+-ia:v (q vvkab0j w- bjsvln the table below

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 between two cells with equal concentration32zyk o.3yp.z +5caejl4wdlg; sa3l/+mvhf ns of sols /aa4l 3onzzv;c+f 53+y.mdgewyl2pk .jlh3 utes.

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14#

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8. Halophytes are plants which live in areas of high sagp2ts6lfs 6w-lt concentrations. Explain why-gf6lw6st2 ps these plants have ion transport pumps in the membranes of their root hair cells.

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15#

问答题 ( 1.0 分) (组内3/3) 切至整卷模式搜藏此题

9. A plant has not been watered for a few days. Explain the changes thg0b2dgpfh txbvgz.; u5p ,8.jat occur in the water potential of one of its cells when it is bathed in distilled wa t b gupbzhpg j0f.d,285gvx;.ter.

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