Which of the following statements about transport in plants is false?
A) Weak bonding between water molecules and the walls of xylem vessels or tracheids helps support the columns of water in the xylem.
B) Hydrogen bonding between water molecules, which results in the high cohesion of the water, is essential for the rise of water in tall trees.
C) Although some angiosperm plants develop considerable root pressure, this is not sufficient to raise water to the tops of tall trees.
D) Most plant physiologists now agree that the pull from the top of the plant resulting from transpiration is sufficient, when combined with the cohesion of water, to explain the rise of water in the xylem in even the tallest trees.
E) Gymnosperms can sometimes develop especially high root pressure, which may account for the rise of water in tall pine trees without transpiration pull.
Answer: E
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Biology
- Xylem vessels, found in angiosperms, have a much greater internal diameter than tracheids, the only xylem-conducting cells found in gymnosperms. The tallest living trees, redwoods, are gymnosperms. Which of the following is an advantage of tracheids over vessels for long-distance transport to great heights?
- Which of the following statements is false concerning the xylem?
- Active transport would be least important in the normal functioning of which of the following plant tissue types?
- Transpiration in plants requires all of the following except
- Which of the following is responsible for the cohesion of water molecules?
- Which of the following has the lowest (most negative) water potential?
- Water potential is generally most negative in which of the following parts of a plant?
- In which plant cell or tissue would the pressure component of water potential most often be negative?
- What is the main force by which most of the water within xylem vessels moves toward the top of a tree?
- What drives the flow of water through the xylem?
- 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?
- One would expect to find the highest density of aquaporins in which of the following?
- One is most likely to see guttation in small plants when the
- The following factors may sometimes play a role in the movement of sap through xylem. Which one depends on the direct expenditure of ATP by the plant?
- Pine seedlings grown in sterile potting soil grow much slower than seedlings grown in soil from the area where the seeds were collected. This is most likely because
- Which of the following is not an important component of the long-distance transport process in plants?
- In plant roots, the Casparian strip is correctly described by which of the following?
- What is the role of proton pumps in root hair cells?
- Which of the following statements about xylem is incorrect?
- All of the following involve active transport across membranes except
- A water molecule could move all the way through a plant from soil to root to leaf to air and pass through a living cell only once. This living cell would be a part of which structure?
- Root hairs are most important to a plant because they
- Which of the following would likely not contribute to the surface area available for water absorption from the soil by a plant root system?
- Which of the following statements is false about bulk flow?
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