Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

The conducting tubes in a vascular cylinder are ______.

  1. a. endodermis
  2. b. pericycle
  3. c. root cortex
  4. d. xylem only
  5. e. xylem and phloem
  6. f. companion cells

Summary Introduction

Introduction: Vascular system is a system in plants where the conducting tubes, such as xylem and phloem are present. The xylem vessel helps in transporting the water and the minerals from the roots to the leaves, and the phloem vessels are involved in transporting the prepared food (glucose) from leaves to all parts of the plants.


Reason for the correct answer: Xylem and phloem tissues are together called as vascular tissues. They form long and slender tubule-like structure called as vascular cylinder. Since both tubes help in the conduction of molecules throughout the plant, they are generally termed as conducting tubes of plants.

Option e. is given as, “xylem and phloem”.

Both the vascular tissues are arranged as tubes, that is, each of their cells is connected end-to-end forming a pipe-like structure. This long and slender tube-like appearance of xylem and phloem enables easy transport of molecules across them.

Hence, option e. is correct.

Reasons for the incorrect answers:

Option a. is given as, “endodermis”. Endodermis is the innermost layer of cortex that is found adjacent to the pericycle present in the roots of plants. Endodermis helps in regulating the water and mineral transport from the root to the xylem vessel. They are not the conducting tubes of vascular cylinder.

Hence, option a. is incorrect.

Option b. is given as, “pericycle”. Primary tissues and most important site for lateral root and secondary meristem initiation (present in plant roots) are called as pericycle...

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