Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 44, Problem 1MC

Taproots

  1. a. are characteristic of dicots.
  2. b. act as sugar sources when leaves are fully developed.
  3. c. are filled with sclerenchyma cells.
  4. d. include white potatoes.
Expert Solution & Answer
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Summary Introduction

Introduction:

The roots are the underground parts of the plant. The basic function is to absorb water and minerals and supply it to aerial parts of the plant. The roots also act as a storage unit for starch.

Answer to Problem 1MC

Correct answer:

The dicotyledonous plants exhibit the taproots. Therefore, option (a) is correct.

Option (a) is given as “are characteristic of dicots”.

Explanation of Solution

Justify reasons for the correct statement:

The major and first root emerged from the primary root system that grows in the downward direction is a taproot. This type of root is present in dicotyledonous plants. The secondary and tertiary roots emerge from the primary taproot that increases the absorption of water.

Hence, option (a) is correct.

Justify reasons for the incorrect statements:

Option (b) is given as “act as sugar sources when leaves are fully developed”.

The roots become sugar sources when the leaves are developing and emerging and this continues until then the leaves are capable of performing photosynthesis. Hence, it is a wrong answer.

Option (c) is given as “are filled with sclerenchyma cells”.

The sclerenchyma cells are dead cells that provide support to plant parts. The roots do not have sclerenchyma cells because they need to absorb water from soil. Hence, it is a wrong answer.

Option (d) is given as “include white potatoes”.

The potatoes are modified stems, whereas, the modified roots are sweet potatoes and carrots. Hence, it is a wrong answer.

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

Conclusion

The taproots are one of the characteristic features of the dicotyledonous plants.

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Students have asked these similar questions
Which of the following statements is incorrect? a. Vascular bundles are arranged in a ring in the outer parts of monocot stems in whereas in eudicots they are scattered throughout the stem. b. The cuticle is a hydrophobic layer that covers the aerial part of plants c. Vascular bundle arrangement is different in stem and root. d. The epidermis and periderm form the dermal tissue of plants.
Which of the following is an example of secondary growth? a. increase in length b. increase in thickness or girth c. increase in root hairs d. increase in leaf number
A monocot stem differs from a eudicot stem in that, in the monocot stem,a. xylem and phloem are in a ring surrounding the pith.b. xylem and phloem are in bundles scattered throughout the stem.c. there is an organized cortex and pith.d. xylem forms a star in the center, with phloem between the points of the star.e. the epidermis does not have a waxy cuticle covering it.

Chapter 44 Solutions

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