Chordate classes from Cyclostomata to Mammalia — practice questions

Question 1 · difficulty L1 · recall

Which feature is present in all chordates at least during some stage of development?

• A. Jointed appendages
• B. Notochord
• C. Water vascular system
• D. Mantle

Question 2 · difficulty L2 · understanding

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : All vertebrates are chordates but all chordates are not vertebrate. Reason (R) : The members of subphylum vertebrata possess notochord during the embryonic period, the notochord is replaced by cartilaginous or bony vertebral column in adults. In the light of the above statements, choose the correct answer from the options given below:

• A. (A) is true but (R) is false
• B. (A) is false but (R) is true
• C. Both (A) and (R) are true and (R) is the correct explanation of (A)
• D. Both (A) and (R) are true but (R) is not the correct explanation of (A)

Question 3 · difficulty L2 · understanding

All living members of the class Cyclostomata are :

• A. Symbiotic
• B. Ectoparasite
• C. Free living
• D. Endoparasite

Question 4 · difficulty L2 · understanding

Which of the following statement is correct about location of the male frog copulatory pad?

• A. Second digit of fore limb
• B. First digit of the fore limb
• C. First and Second digit of fore limb
• D. First digit of hind limb

Question 5 · difficulty L3 · application

A vertebrate is ectothermic, has moist glandular skin, a three-chambered heart and typically requires water for reproduction. Which class is the best match?

• A. Reptilia
• B. Amphibia
• C. Aves
• D. Mammalia

Question 6 · difficulty L3 · understanding

A group of researchers procured some fish like animals and upon investigation the following characters were observed: A. Endoskeleton was made of cartilage. B. Ectoparasitic; as they were found attached on fish skin with their circular sucking mouth. C. Paired fins and scales were absent, but 7 pairs of gill slits were present. Which of the following species of animals did they consider to fit best with these characters?

• A. Scoliodon $s p$.
• B. Petromyzon $s p$.
• C. Exocoetus $s p$.
• D. Branchiostoma sp.

Question 7 · difficulty L3 · understanding

Select the set of fishes which belong to the class Osteichthyes:

• A. Devil fish, Cuttlefish and Hagfish
• B. Saw fish, Fighting fish and Dog fish
• C. Starfish, Hagfish and Cuttlefish
• D. Flying fish, Angel fish and Fighting fish

Question 8 · difficulty L3 · understanding

The flightless bird with forelimbs modified as paddle-like structures suited for swimming is known as:

• A. Struthio
• B. Neophron
• C. Aptenodytes
• D. Psittacula

Question 9 · difficulty L3 · understanding

Match List-I with List-II. List - I List - II (A) Chondrichthyes (I) Clarias (B) Cyclostomata (II) Carcharodon (C) Osteichthyes (III) Myxine (D) Amphibia (IV) Ichthyophis Choose the correct answer from the options given below :

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

Question 10 · difficulty L3 · understanding

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Members of subphylum vertebrata possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult. Reason R: Thus all chordates are vertebrates not all vertebrates are chordates. In the light of the above statements choose the correct answer from the option given below.

• A. A is true but R is false.
• B. A is false but R is true
• C. Both A and R are true and R is the correct explanation of A.
• D. Both A and R are true but R is NOT the correct explanation of A.