Concept explainers
Introduction:
Echinoderms are a major group of marine animals. There are about 7,000 species found usually on the sea floor in every marine habitat. There is a wide variety of colours and the body is uniquely shaped.
Answer to Problem 7STP
The correct answer is Option (b) Respiration.
Explanation of Solution
Explanation/justification for the correct answer:
Option (b) Respiration. As Echinoderms have a poorly designed respiratory system, they make use of their gills and their tube feet to take in oxygen and pass out carbon dioxide. Respiration occurs in two locations on starfish- dermal gills and papulae.
Explanation for incorrect answer:
Option (a) Reproduction- Echinoderms are sexually dimorphic and release their eggs and sperm cells into water, their fertilization is external. So, the correct answer is Option (b)
Option (c) Sensing gravity. Echinoderms use tube feet for locomotion and respiration, so the correct answer is Option (b)
Option (d) Sensing light -Echinoderms use tube feet for locomotion and respiration, so the correct answer is Option (b)
Echinoderms use tube feet for locomotion and respiration, so the correct answer is Option (b).
Chapter 31 Solutions
Biology Illinois Edition (Glencoe Science)
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