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:woy+,ksk3 dkz(syy- 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 there be a net movement of water molecules by os rk9o zf z* ,-k1k le(a+z;sev*kwlfd)doqx 12mosis from cell X to eskko*zalz1 de )ko;(1,*92zqk+-lvdxwf rf cell Y?

A. B. C. D.

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3#

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3. Predict what woulxtggro.h) *u4 8wx8 gw zkl:y,d happen if a eukaryotic animal cell was bathed in a hypertontkwgro8xx w)4g. ulzh8g*:,y ic 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 bathedkx7r dgi*sic u7g0ruvoc:mv*pvk 4 *g-989x f in a cooled liquid to be transported to the operating theatre patient. W98k9 g vcd4k*cvuvg-igrmiup :*x0*s xf77rohat 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 mob q2pe*sz;a;rlecules across a membrane. It requires a membraeqs ;;*rzpba 2ne 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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第 2 题组 (共 7 题 7 分) 当前第1/7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.

a. Calculate the percentage loss in mean mass of the pota9r )orl0sp pa4to chips in 15% sucrose after 20 minu0a o psrl9)4rptes of the 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 mass.iam hc2,3z dg1

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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 val1 giju * +vt7f o2uf9z/ac xucxeu6/w; 2oal2jid results in this expex x7au1 wo to/9c* u;/j+2vulfufe2aicg 6j2zriment.

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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 and of the time are sho)p q hjziyzmt,q;7 7;cwn. Suggest how these uncertaint7m7yq , );tzqcjhz p;iies could be shown 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 measu8b2d)s* si1,j :(caxzz6 ao n lww5qcnrements were taken 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 used in eac8,sz u g3g*iryh concentration.

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12#

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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 also measured q0 3 jrbb;o tr8denf8eq ac1kkq441d*and the data is presented i4;erc b43qq1e8onfabdj*kqt8rd01k n 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 movemenm*y2 lg+hd xg+t of water between two cells with equal concentrations of s+ggxlm2hd *y+olutes.

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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 sasq +0qg-kp 3djlt concentrations. Explain why these plants have ion transport pumps in the me qdkp g+-03jqsmbranes 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. Explaip8hnxe32x 5fd n the changes that occur in the water potential of one of its cells when it is bathd3he5 xp fnx82ed in distilled water.

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