Question

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.

• A. (b), (c) and (e) are correct
• B. (c), (d) and (e) are correct
• C. (a), (b) and (c) are correct
• D. (a), (d) and (e) are correct

Answer 1

The Correct Option is A

Let's evaluate each of the statements to determine which are correct:

1. Statement (a): "Metagenesis is observed in Helminths."
   Metagenesis refers to the alternation of generations between sexual and asexual forms. This phenomenon is typically observed in certain cnidarians, like jellyfish, but not in helminths (parasitic worms), which do not have such an alternation of generations.
   Conclusion: This statement is incorrect.
2. Statement (b): "Echinoderms are triploblastic and coelomate animals."
   Echinoderms, such as starfish and sea urchins, are indeed triploblastic, meaning they develop three primary germ layers. They also have a coelom, which is a cavity within the mesoderm.
   Conclusion: This statement is correct.
3. Statement (c): "Roundworms have an organ-system level of body organization."
   Roundworms or nematodes exhibit an organ-system level of organization, meaning their bodies are organized into systems of organs that perform specific functions.
   Conclusion: This statement is correct.
4. Statement (d): "Comb plates present in ctenophores help in digestion."
   Comb plates, also known as ctenes, are used by ctenophores for locomotion, not digestion. They are groups of cilia that assist in movement.
   Conclusion: This statement is incorrect.
5. Statement (e): "Water vascular system is characteristic of Echinoderms."
   The water vascular system is a network of hydraulic canals unique to echinoderms, aiding in locomotion, feeding, and respiration.
   Conclusion: This statement is correct.

From this analysis, statements (b), (c), and (e) are correct.