Basis of classification - symmetry, coelom and germ layers — practice questions

Question 1 · difficulty L2 · understanding

An animal is triploblastic, bilaterally symmetrical and has a body cavity that is not completely lined by mesoderm. Which body-plan term best describes its cavity?

• A. Acoelomate
• B. Pseudocoelomate
• C. Coelomate
• D. Diploblastic

Question 2 · difficulty L3 · understanding

Select the incorrect statements from the following: A. Digestive system in Platyhelminthes is incomplete. B. Bilateral symmetry is a characteristic feature of adult Echinoderms. C. Pseudocoelom is possessed by Aschelminthes. D. Notochord is persistent throughout life in the class Chondrichthyes. E. Members of class Reptilia maintain a constant body temperature. Choose the answer from the options given below:

• A. A and C only
• B. B and E only
• C. C and D only
• D. B and D only

Question 3 · difficulty L3 · understanding

Open Circulatory system is present in :

• A. Palaemon, Nereis, Balanoglossus
• B. Hirudinaria, Bombyx, Salpa
• C. Anopheles, Limax, Limulus
• D. Pheretima, Musca, Pila

Question 4 · difficulty L3 · understanding

Which of the following pairs is an incorrect match?

• A. Annelids and arthropods-Bilateral symmetry
• B. Sponges-Acoelomates
• C. Coelenterates and Ctenophores-Radial symmetry
• D. Platyhelminthes-Diploblastic organisation

Question 5 · difficulty L3 · understanding

Match List I with List II: List - I List - II A. Pleurobrachia I. Mollusca B. Radula II. Ctenophora C. Stomochord III. Osteichthyes D. Air bladder IV. Hemichordata Choose the correct answer from the options given below :

• A. A-IV, B-II, C-III, D-I
• B. A-II, B-I, C-IV, D-III
• C. A-II, B-IV, C-I, D-III
• D. A-IV, B-III, C-II, D-I

Question 6 · difficulty L3 · understanding

Consider the following statements : A. Annelids are true coelomates B. Poriferans are pseudocoelomates C. Aschelminthes are acoelomates D. Platyhelminthes are pseudocoelomates Choose the correct answer from the options given below :

• A. B only
• B. A only
• C. C only
• D. D only

Question 7 · difficulty L3 · understanding

The following are the statements about non-chordates: A. Pharynx is perforated by gill slits. B. Notochord is absent. C. Central nervous system is dorsal. D. Heart is dorsal if present. E. Post anal tail is absent. Choose the most appropriate answer from the options given below:

• A. A & C only
• B. A, B & D only
• C. B, D & E only
• D. B, C & D only

Question 8 · difficulty L3 · understanding

Select the correct statements : (A) Platyhelminthes are triploblastic pseudocoelomate and bilaterally symmetrical organisms. (B) Ctenophores reproduce only sexually and fertilization is external. (C) In tapeworm, fertilization is internal but sexes are not separate. (D) Ctenophores are exclusively marine, diploblastic and bioluminescent organisms. (E) In sponges, fertilization is external and development is direct. Choose the correct answer from the options given below :

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

Question 9 · difficulty L3 · understanding

Radial symmetry is NOT found in adults of phylum ______.

• A. Hemichordata
• B. Coelenterata
• C. Echinodermata
• D. Ctenophora

Question 10 · difficulty L3 · understanding

Match List-I with List-II List - I List - II (a) Chlamydomonas (i) Conidia (b) Penicillium (ii) Zoospores (c) Hydra (iii) Gemmules (d) Sponge (iv) Buds Choose the correct answer from the options given below :

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