Which of the Following Statements About Transport in Plants Is

question 57

Multiple Choice

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.

Distinguish between various plant adaptations to environmental stresses, such as toxins, water scarcity, and oxygen-poor soils.

Understand the concept of phytoremediation and its applications in environmental science.

Recognize different plant adaptations to xeric (dry) conditions and their physiological implications.

Explain the physiological responses of plants to oxygen-deficiency in their root environment.

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Definitions:

Casparian Strips

A band of cell wall material found in the endodermal cells of plant roots, blocking the passive flow of substances into the plant's vasculature.

Endodermis

The innermost layer of cells in the cortex of plants, serving as a selective barrier that regulates the passage of substances from the soil into the vascular cylinder.

Epidermis

The outermost layer of cells in plants and animals, providing protection against environmental factors.

Stele

The central part of the root or stem containing the tissues derived from the procambium, including xylem, phloem, and sometimes pith.