Chapter 17. 17·12–17·14 Plants transport water, sugar, and minerals through vascular tissue.

Show What You Know - Self Quiz

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You must read each slide, and complete any questions on the slide, in sequence.

Instructions

Check your understanding of concepts from 17·12–17·14 Plants transport water, sugar, and minerals through vascular tissue by answering the following questions.

1.

1. What role does soil play in the life of a terrestrial plant?

The plant is anchored in the soil.

The roots of the plant obtain oxygen from the soil.

The plant obtains water and nutrients from the soil.

All of the above are correct.

Only A and B are correct.

Correct. (See section 17·12 Plants take up water and minerals through their roots.)

Incorrect. (See section 17·12 Plants take up water and minerals through their roots.)

2.

2. The process of water absorption by plant roots generally relies on __________ across the membranes of cells in __________.

active transport; root hairs

osmosis; the apical meristem

osmosis; root hairs

facilitated diffusion; stomata

active transport; the apical meristem

Correct. (See section 17·12 Plants take up water and minerals through their roots.)

Incorrect. (See section 17·12 Plants take up water and minerals through their roots.)

3.

3. The cohesion-tension mechanism relies on what process to draw water upwards into the leaves?

breaking hydrogen bonds between water molecules in the xylem

associating with mycorrhizae

ATP-driven water pumping from the roots

evaporation through stomata

building a greater mineral concentration in the leaf cells than in root cells

Correct. (See section 17·13 Water and minerals are distributed through the xylem.)

Incorrect. (See section 17·13 Water and minerals are distributed through the xylem.)

4.

4. There are two different analogies to describe how fluid is transported through a plant; that of the drinking straw (negative pressure) and that of the hose (positive pressure). Which of the following properly links the type of vascular tissue with its corresponding analogy?

vascular tissue: hose; phloem: straw

phloem: straw; vessel elements: hose

vascular tissue: hose; xylem: straw

xylem: hose; phloem: straw

xylem: straw; phloem: hose

Correct. (See section 17·14 Sugar and other nutrients are distributed through the phloem.)

Incorrect. (See section 17·14 Sugar and other nutrients are distributed through the phloem.)

5.

5. Girdling—removing an unbroken ring of bark around the entire circumference of a tree—will kill the tree. Just above the point of girdling, the bark will become swollen. Why?

Water and mineral nutrients moving from the leaves of the tree to the roots in the phloem are blocked in their transport and collect in place.

Sugars moving down the trunk accumulate just above the girdling, and water moves to this area of high solute concentration.

Debris in the xylem vessels accumulates above the girdling point, creating a blockage.

Starch that is found higher up in the trunk is pulled downwards by gravity.

Water and mineral nutrients moving from the leaves of the tree to the roots in the xylem are blocked in their transport and collect in place.

Correct. (See section 17·14 Sugar and other nutrients are distributed through the phloem.)

Incorrect. (See section 17·14 Sugar and other nutrients are distributed through the phloem.)

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