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 solvent of ionic substa2mrep*i2af v-zl aovrow0w20v6 :(pjnces?

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 molecul*h ngq-o 91j8 ua+txxyes by osmosis from cell X to cell g-q*uaxh81t9+j n xoy Y?

A. B. C. D.

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3#

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3. Predict what would happ(bdrw jh;s i30;u (u8(an onwzen if a eukaryotic animal cell was bathed in a hypertonic solutioni w0d (ro(zuuw;;sh(abj3 n n8.

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 a cooled liquid to be tr rwvrrqtut0x 4,eu 589ansported to the operating theatre patient. Whate, q8ut0rrw4 r9 u5vtx 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 molecules q:hj fgvpd*2ubq9 ;r5across a membrane. It requires a membrane in *hrq2guj:p59; bqvdf 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 g+ vhxerd i6 2 thqhx()v,c8s8the potato chips in 15% sucrose after 20 minutes of the experiment)vrvgeh8t8s, dc +hix2hq( x6.

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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 chip w5qyvp b1ywb3/3 9laes in 15% sucrose 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 givei5+mg)lu;li;duf l8e valid results in this experimii lf;+uld; )gmu5le8ent.

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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 shown. Sug x0dedco)ne*id-kk 5k2 wv2 fiv;62c igest how these uncertainties could be shown on the trend lie d0xk ;2ko -2evcknvd52w ii*f6)dcines.

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10#

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第 2 题组 (共 7 题 7 分) 当前第5/7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.

e. Explain why measurements wejyays;4:c;z z re taken until the $60^{th}$ minute.

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11#

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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 ea4t.n wazzipb;6 j6ez1ch 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 anv j*ggtf/x l 323.edzpd the data is presented f.jepxzvd l *2t/33gg 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 between tw(o 82 o aydm(unb9*flfo cells with equal concentrations of s8fdma(o*(ynulfb9o 2olutes.

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14#

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8. Halophytes are plants which live in areas of high salt concentm 1b lrxwl/k-;+akwc. rations. Explain why these plants have ion transport pumps in the membranes of their root hair celbrl+w k l1w;cak -/.mxls.

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15#

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9. A plant has not been watered for a few days. Explain the exo5a s p6wvvon0x.8zxe o6v7i )qd3 0changes that occur in the water potential of one of its cells when it is bathed in distilled watxvevdq w5xnix8o 6o p).7z0 sv0 eo63aer.

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