Read the following statements :

(a) Metagenesis is observed in Helminths.

(b) Echinoderms are triploblastic and coelomate animals.

(c) Round worms have organ-system level of body organization.

(d) Comb plates present in ctenophores help in digestion.

(e) Water vascular system is characteristic of Echinoderms.

Choose the correct answer from the options given below.

We evaluate each statement one by one.

(a) Metagenesis is observed in Helminths.
Metagenesis refers to a life‑cycle that alternates between sexual and asexual generations (a form of alternation of generations). Helminths (parasitic worms such as nematodes, platyhelminths, and acanthocephalans) reproduce primarily by sexual reproduction; they do not show metagenesis. Hence this statement is incorrect.

(b) Echinoderms are triploblastic and coelomate animals.
Echinoderms possess three germ layers (ectoderm, mesoderm, endoderm) and a true coelom that develops from the mesoderm. Therefore the statement is correct.

(c) Round worms have organ‑system level of body organization.
Round worms (nematodes) have a well‑defined digestive tract, nervous system, excretory system and reproductive system, all organized into distinct organ systems. Thus the body organization is at the organ‑system level, making the statement correct.

(d) Comb plates present in ctenophores help in digestion.
Comb plates (ctenes) are rows of fused cilia used for locomotion in ctenophores. They are not involved in digestion; the digestive process occurs in the gut lumen and associated cells. Consequently, this statement is incorrect.

(e) Water vascular system is characteristic of Echinoderms.
A unique hydraulic system called the water vascular system, which powers tube feet and aids in locomotion and feeding, is a hallmark of echinoderms. This makes the statement correct.

Summarizing the truth values:

Correct statements: (b), (c) and (e).
Incorrect statements: (a) and (d).

Therefore the option that lists the correct statements is (b), (c) and (e) are correct.