Chapter 26, Problem 9STP

Summary Introduction

Introduction :

Protists are more readily categorized by what they are not, than by what they are. Protists aren't animals, plants, or fungi because they don't have all the requisite characteristics to put them in any of these domains. As with all eukaryotes, protist DNA is present inside the membrane-bound nucleus.

Answer to Problem 9STP

Correct answer :

The correct answer is option (A) feeding

Explanation of Solution

Explanation/justification for the correct answer :

Option (A) feeding. Protists are categorized by the form they use to get nutrition. Through this approach, protists are categorized into three classes, such as animal-like protists, plant-like protists, and fungus like protists. Animal like protists preys on bacteria; plant-like protists produce their own food by photosynthesis; fungi like protists live on dead remains. So, the correct answer is option (A).

Explanation for incorrect answer :

Option (B) habitat. Usually, protists are present in wet or marine habitats such as dead trees, damp vegetation, lakes, and oceans. So, this is an incorrect answer.

Option (C) structure. Within the membrane-bound nucleus is containing DNA of protists. While protists have a cellular similar structure to other eukaryotes, their reproductive methods vary remarkably. So, this is an incorrect answer.

Option (D) reproduction. Protists reproduce by sexual and asexual processes. So, this is an incorrect answer.