SL/HL Topic D2.3 Water potential - 题库网 (tiku.one)

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1#

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1. Why is water a good solwp s*v .p tpx26teobk sv//0tbd2 )lp3vent 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 w* 9zlqe p-rkv)ater molecules by osmosis from cell X to cell Y? elr*9k-pq z)v

A. B. C. D.

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3#

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3. Predict what would happen if a ev0 ;8.o4k uwf fhqjq8zukaryotic animal cell was bathed in a hypertonic s0j ;ko8fu. h8vqzfq4wolution.

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 transported tohxz1 ia 2;tz*j the operating theatre patient. What should be a property of this liquid?*1zh z2 txji;a

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 moveme7a 0 htw -snwda9m09 vl:d1)eqew2l5:m ntbkwnt of water molecules across a membrane. It requires a membrane in order te mw:qn1l2kaa:ehd09bt0m5)-st79w l wvdn w 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 in mean mass of the potato chips in 15% sucrosenq:v k d1wu3w1 after 20 qwvn :31ukwd1minutes 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.3-*k- hdaxvmk9sos 0y

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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 variabjf z9jz7 zl1g.les that must be controlled to give valid results in this experim 17 gj9ljzzfz.ent.

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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. Suggest how these udk/s 3p(k/1wqd 9judk ncertainties could be shown on theuj(d/p ds1w3 dk/9k kq 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 measurementm1hjiv1a6 m6f-m j6xas were taken until the

60^{t h}

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 were used in e :1)l hg7vtrer i/1el mcr7n0)y5 wt9gu7bbayach 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 i x kpltolh6-6:s present:t -66opllh kxed 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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7. Outline the movement of water between two cells with equal concentrations o3m b9 b u5w9logp72eaktfv24vf solutesgteb w fp2v3ok5ubl94a27 v9 m.

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14#

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8. Halophytes are plants which live in ) yma;s13mx+d p wqg5nareas of high salt concentrations. Explain why these plants have ion transport pumps in the membranes of their root hair cellyaw s;qdp1 +g3n)5m xms.

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15#

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9. A plant has not been watered for a few4 eimv sp,zixh gm/ xp) 8kp553r-zi:z days. Explain the changes that occur in the water potential of one of its cells when it is bathed in dh ),vxg5pri :3zkpm4e8-pzi ism/x z5istilled water.

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