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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Which of the following cell types remain alive in mature plant tissue?

  1. a. sclerenchyma
  2. b. sieve elements
  3. c. tracheids
  4. d. vessel elements

Summary Introduction

Concept Introduction: The phloem of the plant cell is composed of sclerenchyma, parenchyma, sieve elements and companion cells. The sieve element and the companion cells are found closely associated with each other. They are highly specialized type of elongated cells found in the phloem tissue of flowering plants.

Explanation

Reasons for correct statement:

The main function of the sieve tube is to transport carbohydrate mostly sucrose in the plant. The transport from the leaves to the fruits and roots are possible as they are living cells.

Option b. is given as “sieve elements”. The sieve elements remain alive in the mature plant tissues, therefore option b is correct.

Reasons for the incorrect statements:

Option a. is given as “sclerenchyma”.

Sclerenchyma cells include fibers and sclereids and these cells will die at maturity. When the cells die, their lignin reinforced walls will remain and support the plant...

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