Find out the statements which are correct.
(I) Balanoglossus have a rudimentary structure, in collar region called stomochord, a structure similar to nerve cord.
(II) An excretory system is absent in echinoderms.
(III) In hemichordates the excretory organ is proboscis gland.
(IV)Ascaris have blind sac body plan.
(V) Nereis is a dioecious animal.
Text Solution
Verified by ExpertsC
Correct statements
(II) Echinoderms lack specialized excretory organs and so nitrogenous wastes chiefly in the form of ammonia, diffuses out through the respiratory surfaces.
(III) Proboscis gland is an excretory organ in hemichordates.
(V) Dioecious means having the male and female reproductive organs in separate individuals. It is seen in Nereis.
Incorrect statement
(I) In hemichordata (Balanoglossus), they have a rudimentary structure in the collar region called stomochord (outgrowth of buccal cavity) but true notochord is absent.
(IV) A blind sac body plan is characterized by a digestive cavity that has a single aperture, which functions as mouth and anus. It is seen in phylum Coelenterates to Platyhelminthes. While in Ascaris, tube-within a tube body plan is present.
──────────────────────────────────────────────────────────────────────────────────────────
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems