Essntls. Of Human Anat....-With CD and Mod.Access
Essntls. Of Human Anat....-With CD and Mod.Access
11th Edition
ISBN: 9780134009629
Author: Marieb
Publisher: PEARSON
Question
Chapter 1, Problem 1MC
Summary Introduction

Introduction:

The levels of organization of a living organism are the arrangement of different levels from the simplest to the most complex structure. The different levels of the organization, on the basis of complexity, help in understanding the evolution a biological system.

Expert Solution & Answer
Check Mark

Answer to Problem 1MC

Correct answer:

The different levels of organization in order of increasing complexity are chemical, cellular, tissue, organ, systemic, and organismal.

Explanation of Solution

Explanation for the correct answer:

Option (d) is given as chemical, cellular, tissue, organ, systemic, and organismal levels are the levels in the order of increasing complexity. The chemical level consists of ions, atoms, and small molecules. These identities combine in a specific way to form a cell. The cell is the smallest level, which comprises of living identities.

The group of cells that have common function arrange to form a tissue. Two or more tissue form an organ that performs a specific function. A group of organs that function together to perform a common task is called organ system. The different organ systems make up a living organism. Hence, option (d) is correct.

Explanation for incorrect answers:

Option (a) is given as chemical, tissue, organ, cellular, organismal, and systemic are the levels in the order of increasing complexity. The identities of the chemical level (atom, ions, and small molecules) arrange themselves to form a cellular structure and not a tissue. So, it is an incorrect option.

Option (b) is given as chemical, cellular, tissue, organismal, organ, and systemic are the levels in the order of increasing complexity. The atoms and small molecules of the chemical level arrange themselves to form a cellular structure. The cells performing same function form a tissue. The tissues form an organ, which, in turn, organizes to form an organ system. So, it is an incorrect option.

Option (c) is given as organ, chemical, tissue, cellular, systemic, and organismal are the levels in the order of increasing complexity. The simplest level is chemical and not an organ. So, it is an incorrect option.

Option (e) is given as cellular, chemical, organ, tissue, systemic, and organismal are the levels in the order of increasing complexity. The simplest level is chemical and not cellular. So, it is an incorrect option.

Hence, options (a), (b), (c), and (e) are incorrect.

Conclusion

The increasing order of complexity of an organism begins at the simplest level (the chemical level) and goes up to the organismal level (a living organism, for example, a human being).

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