Question

Choose the correct statements:
Statements:
A. Many echinoderms are able to regenerate lost parts.
B. In many echinoderms, respiration and waste removal takes place by means of skin gills.
C. Sea urchins lack distinct arms but have the same five-part body plan as all other echino derms.
Choose the correct answer from the options given below:

• A. (A), (B), and (C)
• B. (B) and (C) only
• C. (A) and (B) only
• D. (A) and (C) only

Hint:

Echinoderms, such as sea stars and sea urchins, exhibit radial symmetry and a unique water vascular system for locomotion and feeding.

Answer 1

The Correct Option is A

All the given statements are correct descriptions of echinoderm characteristics, including regeneration, skin gills for respiration, and the five-part body plan.

• (A): Many echinoderms, such as sea stars, have the remarkable ability to regenerate lost arms or body parts. This is a key feature of their biology.
• (B): Respiration and waste removal in echinoderms occur through skin gills (dermal branchiae), which are extensions of their coelom.
• (C): Sea urchins are echinoderms with a five-part radial symmetry, like other members of this phylum, but they lack distinct arms, unlike sea stars.