Platyhelminthes, Aschelminthes, Annelida — NEET & JEE Questions

Question 1 · difficulty L1 · recall

Which phylum contains flatworms such as Planaria and Taenia?

• A. Platyhelminthes
• B. Annelida
• C. Aschelminthes
• D. Arthropoda

Question 2 · difficulty L2 · understanding

Which combination correctly distinguishes annelids from flatworms?

• A. Annelids are segmented and coelomate, while flatworms are unsegmented and acoelomate
• B. Annelids are diploblastic, while flatworms are triploblastic
• C. Annelids are pseudocoelomate, while flatworms are coelomate
• D. Annelids lack organ systems, while flatworms possess them

Question 3 · difficulty L2 · understanding

Which feature best distinguishes annelids from platyhelminths and aschelminths?

• A. True metameric segmentation
• B. Bilateral symmetry
• C. Triploblastic organisation
• D. Presence of organ systems

Question 4 · difficulty L2 · understanding

Aschelminthes are commonly described as pseudocoelomates because

• A. the body cavity is not completely lined by mesoderm
• B. they lack any body cavity
• C. their coelom is fully lined by mesoderm
• D. they possess only a gastrovascular cavity

Question 5 · difficulty L3 · understanding

Match List-I with List-II. List-I List-II (a) Metamerism (i) Coelenterata (b) Canal system (ii) Ctenophora (c) Comb plates (iii) Annelida (d) Cnidoblasts (iv) Porifera Choose the correct answer from the options given below.

• A. (a) (b) (c) (d) (iv) (i) (ii) (iii)
• B. (a) (b) (c) (d) (iv) (iii) (i) (ii)
• C. (a) (b) (c) (d) (iii) (iv) (i) (ii)
• D. (a) (b) (c) (d) (iii) (iv) (ii) (i)

Question 6 · difficulty L3 · application

An animal is dorsoventrally flattened, bilaterally symmetrical and acoelomate. It most likely belongs to

• A. Platyhelminthes
• B. Aschelminthes
• C. Annelida
• D. Mollusca

Question 7 · difficulty L3 · application

An unsegmented cylindrical worm with a complete digestive tract and pseudocoel is most likely a

• A. roundworm
• B. flatworm
• C. annelid
• D. cnidarian

Question 8 · difficulty L3 · application

An animal with repeated body segments, a true coelom and closed circulation is most consistent with

• A. Annelida
• B. Platyhelminthes
• C. Aschelminthes
• D. Porifera

Question 9 · difficulty L4 · analysis

Animal X is dorsoventrally flattened and lacks a body cavity. Animal Y is cylindrical, unsegmented and has a pseudocoelom. Animal Z is segmented and coelomate. Which sequence correctly identifies their phyla?

• A. Platyhelminthes, Aschelminthes, Annelida
• B. Aschelminthes, Platyhelminthes, Annelida
• C. Platyhelminthes, Annelida, Aschelminthes
• D. Annelida, Aschelminthes, Platyhelminthes

Question 10 · difficulty L4 · application

Which sequence correctly matches phylum with body-cavity condition?

• A. Platyhelminthes—acoelomate; Aschelminthes—pseudocoelomate; Annelida—coelomate
• B. Platyhelminthes—coelomate; Aschelminthes—acoelomate; Annelida—pseudocoelomate
• C. All three—acoelomate
• D. All three—true coelomate