Exam 36: Resource Acquisition and Transport in Vascular Plants

Bulk flow is much faster than diffusion or active transport. Peak velocities in the transport of xylem sap can range from ________ for trees with wide vessel elements.

A plant cell with a Ψ_S of -0.65 MPa maintains a constant volume when bathed in a solution that has a Ψ_S of -0.30 MPa and is in an open container. The cell has a

The leaf area index is the ratio of the ________.

Water flows into the source end of a sieve tube because ________.

Photosynthesis ceases when leaves wilt, mainly because ________.

What is the advantage of having small, needle-like leaves?

Formation of the curved upper surface, such as occurs in a tube filled with water, is an important factor in plant water movement. A curved upper surface is created by ________.

Phloem sap can flow ________.

How does a flaccid cell differ from a turgid cell?

Which of the following would be least likely to affect osmosis in plants?

If isolated plant cells with a water potential averaging -0.5 MPa are placed into a solution with a water potential of -0.3 MPa, which of the following would be the most likely outcome?

The value for Ψ in root tissue was found to be -0.15 MPa. If you take the root tissue and place it in a 0.1 M solution of sucrose (Ψ = -0.23 MPa), the net water flow would ________.

Plasmodesmata can change in number, and when dilated can provide a passageway for ________.

Which one of the following statements about transport of nutrients in phloem is correct?