24. In general, plants are almost always moving nutrients against a concentratio

Question

24. In general, plants are almost always moving nutrients against a concentration gradient because a. the needed nutrients are almost always relatively rare in the soil compared to their concentration inside the roots. b. soil pH has such a strong effect on root tissue pH. e. there is only rarely enough water in the soil to be able to move nutrients to the plant. d. nutrients are almost always bound to soil particles outside the roots. 25. The lack of organelles in sieve-tube elements favors: a. transpiration. b. the pressure-flow mechanism. c. solute potential in the xylem. d. the cohesion-tension mechanism. e. movement through the symplastie route. 26. Moving photosynthetically produced sucrose into storage vacuoles requires the expenditure of as to power ATP so a. sucrose pumps in the membranes of "sink" cells. b. sucrose pumps in companion cell membranes. c. molecular water pumps in the storage vacuoles. d. potassium pumps in the cellulose cell wall. e. proton pumps in the vacuole membrane.

Explanation / Answer

ANSWER:

24) a) The needed nutrients are almost always relatively rare in the soil compared to their concentration inside the roots.

25) c) solute potential in the xylem

The lack of organelles in sieve tube elements favors solute potential in the xylem

26) c) molecuar water pumps in the storage vaculoles

Moving Photosynthetically produced sucrose into storage vacuoles requires the expenditure of ATP so as to power molecuar water pumps in the storage vaculoles

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