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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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In phloem, organic compounds flow through _______.

  1. a. collenchyma cells
  2. b. sieve elements
  3. c. vessels
  4. d. tracheids

Summary Introduction

Introduction: Phloem vessels present in the vascular tubes are involved in transporting the prepared food (glucose) from leaves to all parts of the plants. Specialized types of elongated and slender tube found in the phloem tube are called as sieve tubes or sieve elements. Sieve tubes are characteristics of flowering plants. Sieve tube transports carbohydrates to different parts of the plant.

Explanation

Reason for correct answer: Sieve elements are the conducting tube of phloem vessel that facilitates the transport of organic nutrients (carbohydrates, vitamins, hormones, and so on) with the help of adjacent companion cells.

Option b. is given as “sieve elements”. Phloem tube consists of a long-distance channel meant for the transportation of prepared food and nutrients from the leaves to different parts of the plant and is called as sieve tubes.

Hence, the correct answer is option b.

Reasons for incorrect answer:

Option a. is given as “collenchyma cells”. Collenchyma cells are long cells with irregular thick cell walls made up of cellulose and pectin. They provide structural support to the plants...

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