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Which of the following are long, thin cells thatoverlap, are tapered end to end, and carry water?
a. parenchymab. sieve tube membersc. tracheidsd. companion cellse. phloem
Answer: c
Which of the following results from the directexpenditure of energy in a plant?
a. root pressureb. evaporation of water from the leavesc. water flowing into the root apoplastd. transpirational flowe. sap flowing down from the leaves to the roots
Answer: e
The rate of flow of water through the xylem isregulated by
a. passive transport in the pith.b. the force of transpirational pull.c. active transport by the sieve-tube members.d. the number of companion cells in the phloem.e. active transport by tracheid and vessel cells.
Answer: b
The driving force for the movement of materials in the phloem of plants is
a. gravity.b. a difference in osmotic pressure between the source and sink.c. root pressure.d. transpiration of water through the stomata.e. adhesion of water to vessel elements.
Answer: b
Which of the following has the lowest water potential?
a. root xylemb. stem xylemc. soild. air spaces in the leafe. root hairs
Answer: d
s p
s p
Bulk flow:Movement dueto pressure(tension)
Which of the following are long, thin cells thatoverlap, are tapered end to end, and carry water?
a. parenchymab. sieve tube membersc. tracheidsd. companion cellse. phloem
Answer: c
Which of the following results from the directexpenditure of energy in a plant?
a. root pressureb. evaporation of water from the leavesc. water flowing into the root apoplastd. transpirational flowe. sap flowing down from the leaves to the roots
Answer: e
The rate of flow of water through the xylem isregulated by
a. passive transport in the pith.b. the force of transpirational pull.c. active transport by the sieve-tube members.d. the number of companion cells in the phloem.e. active transport by tracheid and vessel cells.
Answer: b
The driving force for the movement of materials in the phloem of plants is
a. gravity.b. a difference in osmotic pressure between the source and sink.c. root pressure.d. transpiration of water through the stomata.e. adhesion of water to vessel elements.
Answer: b
Which of the following has the lowest water potential?
a. root xylemb. stem xylemc. soild. air spaces in the leafe. root hairs
Answer: d
