Biology STAAR (State of Texas Assessments of Academic Readiness) Practice Test

Disable ads (and more) with a membership for a one time $2.99 payment

Study for the Biology STAAR Test. Dive into the world of biology with detailed assessments, practice questions, and tips for exam success. Enhance your understanding and be prepared to excel!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What feature distinguishes mollusks from other invertebrates?

Presence of jointed appendages
Possession of a shell in most species
Having a segmented body
Exhibiting radial symmetry

The correct answer is: Possession of a shell in most species

The distinguishing feature of mollusks from other invertebrates is the possession of a shell in most species. This characteristic is significant because it plays a critical role in the protection and survival of these organisms. Mollusks typically have a hard external shell made of calcium carbonate, which serves as a protective barrier against predators and environmental hazards. While not all mollusks possess a shell (for instance, octopuses and some limpets), the presence of a shell is a common trait among the majority, including snails, clams, and squids, thereby setting them apart from many other invertebrate groups. This shell is also a key factor in the classification and study of mollusks within the broader context of biological diversity.