Biological Science
Biological Science
5th Edition
ISBN: 9780321743671
Author: Scott Freeman
Publisher: PEARSON
bartleby

Concept explainers

bartleby

Videos

Textbook Question
Book Icon
Chapter 37, Problem 2TYK

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

Expert Solution & Answer
Check Mark
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 2TYK

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.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
Students have asked these similar questions
The Snapdragon is a popular garden flower that comes in a variety of colours, including red, yellow, and orange. The genotypes and associated phenotypes for some of these flowers are as follows: aabb: yellow AABB, AABb, AaBb, and AaBB: red AAbb and Aabb: orange aaBB: yellow aaBb: ? Based on this information, what would the phenotype of a Snapdragon with the genotype aaBb be and why?   Question 21 options:   orange because A is epistatic to B   yellow because A is epistatic to B   red because B is epistatic to A   orange because B is epistatic to A   red because A is epistatic to B   yellow because B is epistatic to A
A sample of blood was taken from the above individual and prepared for haemoglobin analysis. However, when water was added the cells did not lyse and looked normal in size and shape. The technician suspected that they had may have made an error in the protocol – what is the most likely explanation?   The cell membranes are more resistant than normal.   An isotonic solution had been added instead of water.   A solution of 0.1 M NaCl had been added instead of water.   Not enough water had been added to the red blood cell pellet.   The man had sickle-cell anaemia.
A sample of blood was taken from the above individual and prepared for haemoglobin analysis. However, when water was added the cells did not lyse and looked normal in size and shape. The technician suspected that they had may have made an error in the protocol – what is the most likely explanation?   The cell membranes are more resistant than normal.   An isotonic solution had been added instead of water.   A solution of 0.1 M NaCl had been added instead of water.   Not enough water had been added to the red blood cell pellet.   The man had sickle-cell anaemia.
Knowledge Booster
Background pattern image
Biology
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
Biology (MindTap Course List)
Biology
ISBN:9781337392938
Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher:Cengage Learning
Text book image
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Biology
ISBN:9781305967359
Author:STARR
Publisher:CENGAGE L
Text book image
Concepts of Biology
Biology
ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:OpenStax College
Text book image
Biology 2e
Biology
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:OpenStax
Text book image
Biology Today and Tomorrow without Physiology (Mi...
Biology
ISBN:9781305117396
Author:Cecie Starr, Christine Evers, Lisa Starr
Publisher:Cengage Learning
Text book image
Biology: The Dynamic Science (MindTap Course List)
Biology
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Cengage Learning
General Embryology Review in 20 minutes; Author: Medical Animations;https://www.youtube.com/watch?v=4YKvVeVMmEE;License: Standard youtube license