Echinodermata and Chordata Overview

Which characteristic is unique to Echinodermata?

What type of symmetry do adult Echinodermata exhibit?

What is the circulatory system type in Chordata?

Which system is absent in Echinodermata?

Which of the following is characteristic of both Echinodermata and Chordata?

Which feature is commonly found in the subphylum Vertebrata under Chordata?

In Echinodermata, what type of reproduction is most common?

Which of the following characteristics can sometimes be lost in adult Chordata?

Echinodermata

Marine animals, usually slow-moving
6 classes, mostly carnivores, some filter-feeders
Radial symmetry in adults, bilateral in larvae
External fertilization
Simple brain, nerve ring, with nerves and sense organs
Complete digestive system, extracellular digestion
Open circulatory system, reduced 1-chambered heart
No excretory system
Coelom present
Endoskeleton, with calcium (reduced in sea cucumbers)
No segmentation

Chordata

15 classes, 52,000 living species
Notochord, dorsal hollow nerve cord, pharyngeal pouches (gill slits), and a muscular post-anal tail
Three subphyla
Mostly in Vertebrata subphylum
Bilateral symmetry
Sexual reproduction, usually separate sexes
External or internal fertilization
Brain with dorsal hollow nerve cord and ganglia, sense organs
Complete digestive system
Closed circulatory system, heart with 2 or more chambers
Respiratory system, gills or lungs
Excretory system, nephridia
Coelom present
Notochord (sometimes lost in adult), endoskeleton (sometimes with calcium)
Muscular, post-anal tail (sometimes lost in adult)
Usually with paired appendages
Segmentation reduced or absent

Explore the fascinating world of Echinodermata and Chordata with this quiz. Learn about their unique structures, reproductive methods, and anatomical features. Test your knowledge on their classes, characteristics, and differences through this engaging assessment.