Biological Science (7th Edition)
Biological Science (7th Edition)
7th Edition
ISBN: 9780134678320
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
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Chapter 34, Problem 1TYK

What is a sieve-tube element?

a. the sugar-conducting cell found in phloem

b. the widened, perforation-containing, water-conducting cell found only in angiosperms

c. the nutrient- and water-absorbing cell found in root hairs

d. the nucleated and organelle-rich support cell found in phloem

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Summary Introduction

Introduction:

The plants consist of two important tissues, namely, phloem and xylem. Phloem is responsible for the transfer of organic molecules across different cells in the plants. Sieve-tube cells are the specialized cells that are present in the phloem tissue for the transport of carbohydrates.

Answer to Problem 1TYK

Correct answer:

The sieve-tube cells or the sieve-tube elements are the dead, elongated cells found in the phloem of the angiosperms. These elements carry out the transfer of sugar in the plants.

Explanation of Solution

Explanation/Justification for the correct answer:

Option (a) is given as the cell that is responsible for the conduction of sugars. The sieve-tube elements are the specialized cells involved in the conduction of the sugars in the plants. Carbohydrate (starch) is one such form of sugar. On maturity, they are considered as dead cells due to lack of nucleus. These cells are present in the phloem of the angiosperms. Hence, Option (a) is correct.

Explanation for incorrect answer:

Option (b) is given as the widened, perforation-containing, water-conducting cell found only in angiosperms. The perforation-containing, widened cells that carry out transport of water are known as xylem. So, it is a wrong answer.

Option (c) is given as cells that are found in the root hairs and are responsible for the absorption of water and nutrients. The roots hairs are also known as trichoblasts. The trichoblast is formed from the epidermis layer of the root of the plant. So, it is a wrong answer.

Option (d) is given as the nucleated and organelle-rich cells found in phloem. The nucleated and organelle-rich support cells in the phloem are also known as companion cells. The companion cells are those that transport the sugar to the sieve-tube elements in the leaves from the mesophyll. So, it is a wrong answer.

Hence, options (b), (c), and (d) are incorrect.

Conclusion

Thus, sieve–tube cells represent the class of cells that are specialized for the transportation of sugar in the plants and are found in the phloem.

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Students have asked these similar questions
Match the following plant cells and tissues with their definition: - v Collenchyma A. grouped in strands and help support young parts of the plant shoot. They have unevenly thickened primary cell walls. - v Sugar-conducting cells of the phloem B. are alive at maturity, but lack organelles. Each sieve-tube element is connected to a companion cell by plasmodesmata. Water-conducting cells of the xyleem v Sclerenchyma C. The two types of water-conducting cells, tracheids and vessel elements, are dead and lignified at maturity. - v Parenchyma D. rigid due to thick secondary walls containing lignin, dead at functional maturity and play a role in support in the plant. E. cells are flexible and provide the most diversity of functions (such as photosynthesis)
Which of the following statements is NOT true of the stems of vascular plants? a. Stems are composed of repeating segments, including nodes and internodes. b. Primary growth only occurs at the shoot apical meristem. c. Vascular tissues may be arranged on the outside of the stem or scattered throughout the stem. d. Stems can contain stomata.
A difference between monocot and dicot plant stems is thea. absence of buds in monocots.b. organization of vascular tissue.c. presence of guard cells.d. absence of stomata.
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