Chapter 25, Problem 6STP

Summary Introduction

Introduction :

The phylogenetic tree can be defined as the linear representation of the evolutionary relationship between the organism. It is used to determine the similarity and the difference between the evolution of the organism.

Answer to Problem 6STP

Correct answer :

Option (D).

Explanation of Solution

Explanation/justification for the correct answer :

Option (D) Tissue. The sponges are multicellular, but lack tissues. They do not have specific cells that perform a specific task. The tissue level organization was introduced by cnidarians and other higher phyla. Hence, the correct answer is option (D).

Explanation for incorrect answer :

Option (A)Cell wall. All animals including sponges lack cell wall. Hence, it is an incorrect answer.

Option (B) coeloms. The point A includes a criteria which belong to the cnidarians too. Cnidarians lack coelom. Hence, it is an incorrect answer.

Option (C) tentacles. Tentacles are also present in the sponges and the point A excludes sponges. Hence, it is an incorrect answer.