Chapter 24, Problem 6A

Summary Introduction

Introduction :

All animal cells, excluding sponges, are divided into structural and functional units which are called tissue. Tissue is a collection of cells specialized in performing a particular purpose. The hox genes are critical in determining an organism's body plan.

Answer to Problem 6A

Correct answer :

The correct answer is option (A) cell differentiation

Explanation of Solution

Explanation/justification for the correct answer :

Option(A) cell differentiation. Cell differentiation is the mechanism whereby the cells specialize in form and function. Hox genes which control the differentiation of the cells. They code for transcription factors, which are found in embryo areas that are in the same order as the chromosome genes.So, the correct answer is option (A).

Explanation for incorrect answer :

Option (B) movement.The evolution of nerve and muscle fibers of certain kingdoms helps animals to function of ways that are more complex and quicker than humans. It is one significant feature of the animals kingdom.So, this is an incorrect answer.

Option(C) digestion.The food has to be digested by animals after consuming food. Many species digest food inside different cells although there are few species who can digest their food within cavities of the human body.So, this is an incorrect answer.

Option (D)neural stimulation. Nerve tissue is involved in the bodywide transmission of nerve impulses.So, this is an incorrect answer.