Carbohydrate Transport by Phloem

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Animation: Phloem transport

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Animation Assessment

Question 1 of 5

Where do stems and roots acquire the foods they need for respiration and therefore growth?

Question 1 choicesChoice A., uptake of organic substances from the soilChoice B., uptake of mineral substances from the soilChoice C., transport of carbohydrates from the leavesChoice D., transport of proteins from the leavesChoice E., transport of ATP from the leaves

Correct.

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Question 2 of 5

What tissue is most commonly related with transport of carbohydrates from sources to sinks in plants?

Question 2 choicesChoice A., xylemChoice B., epidermisChoice C., mesophyllChoice D., bundle sheathsChoice E., phloem

Correct.

Incorrect.

Question 3 of 5

Phloem sap must flow readily between the phloem cells in order to move from source to sink. What special structures in phloem cells facilitate flow of phloem sap from one phloem cell to the next?

Question 3 choicesChoice A., plasmodesmataChoice B., sieve platesChoice C., companion cellsChoice D., pits

Correct.

Incorrect.

Question 4 of 5

Phloem functions to move carbohydrates from sources to sinks. Normally, the source is photosynthesis (green leaves). What other tissue might be a “source”?

Question 4 choicesChoice A., roots that store carbohydrates over the winterChoice B., leaves that store carbohydrates over the winterChoice C., flowers that store carbohydrates over the winter

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Question 5 of 5

Leaf cells can export sugar into phloem cells in the veins of leaves as a result of photosynthesis. What osmotic consequence can you predict?

Question 5 choicesChoice A., Water moves toward the sugars, increasing osmotic pressure.Choice B., Water moves away from the high sugar content, decreasing osmotic pressure.Choice C., Sugar diffuses away from the high leaf concentration, reducing osmotic pressures.Choice D., Sugar diffuses into the cells to balance osmosis.

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Assessment Summary

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