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 snuj8319b3 w*o x7mhzp r4jrt holvent 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 there be a net movement of wll :.vn6 cflg23qlyhyj n6.l 6ater molecules by osmosisnlcyyh .jl.l6ln632v: f g6ql from 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 eukaryotiak ent-frpm*h8 90z u-j 22qjt2a0 kuuc animal cell was bathed in a hypertonic sz2 - ajmt2*p 8k2au 90-knqurjfeh 0utolution.

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 in n1ei,nmwu7aw4r s+p4 a cooled liquid to be transported to the operating theatre patient. What should be a property of thisn4u4s 7+i ea wnm1,rpw 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 ; dk pr11/nae(yf3gtry sr2+vwater molecules across a membrane. It requires a membrane in ordy(rv+sdk1r f/gn2p;ytae 3 1 rer 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 ej+c6dbu+3 3r3qnn1/foxe zcchips in 15% sucrose after 20 minutes of the nz+ebru+d63 1occj 3f3xen/ q 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 mas icke)d uox3o2.jt6q(s.

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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 epmz 7mo /14c/ui+qbfgive valid results in this experime47upimf+ moc b1 zeq//nt.

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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 a,huvr;j- )wnq tk7; ytnd of the time are shown. Suggest how these uncertainties could be syj -;,t7kquvt w n);rhhown on the trend lines.

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10#

问答题 ( 1.0 分) (组内5/7) 切至整卷模式搜藏此题

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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 takenc1cc s/wu8g83tflno br2a:p2 until the $60^{th}$ minute.

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11#

问答题 ( 1.0 分) (组内6/7) 切至整卷模式搜藏此题

第 2 题组 (共 7 题 7 分) 当前第6/7题

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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 were e:;+iwywh 9zjx mj1 6p+u mje(used in each concentration.

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12#

问答题 ( 1.0 分) (组内7/7) 切至整卷模式搜藏此题

第 2 题组 (共 7 题 7 分) 当前第7/7题

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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- d1v xp,22lz- 5dfx ku9ypntq also measured and the data is presente f p,2zt-xu5p-2qddy9vxknl1d in 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 betwee*h( j e)b6rruzn two cells with equal concentrations of solutbrr6*)uzej(h es.

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14#

问答题 ( 1.0 分) (组内2/3) 切至整卷模式搜藏此题

8. Halophytes are plants which live in areas of high sa/bo(/7irl1 xj fba*ujlt concentrations. Explain why these plants have ion transport pumps in the membranes of their root hair cx/f/*r oi(b 7ba ujjl1ells.

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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 that occur;rhzgwz0p3 r8 rom 4+d in the water potential of one of its w;4g+0o 83rhrprz dmzcells when it is bathed in distilled water.

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