Animal Kingdom Question 1
Question: Select the correct statements with reference to chordates.
A. Presence of a mid-dorsal, solid and double nerve cord.
B. Presence of closed circulatory system.
C. Presence of paired pharyngeal gillslits.
D. Presence of dorsal heart
E. Triploblastic pseudocoelomate animals.
Choose the correct answer from the ptions given below:
(1) C, D and E only
(2) A, C and D only
(3) B and C only
(4) B, D and E only
Show Answer
Answer: (2) A, C and D only
Explaination-
Defining characterstics of chordates:
-
Presence of a closed circulatory system- where blood is enclosed within vessels, allowing for efficient distribution of oxygen, nutrients, and waste products.
-
Presence of paired pharyngeal gill slits- in their embryonic stages. In some chordates, these gill slits are also present in the adult stage and may be used for respiration or other functions.
-
Chordates do have a nerve cord, but it is not always mid-dorsal, solid, or double in all chordate groups. In vertebrates, the nerve cord is typically dorsal
-
Have a ventral (located on the underside) heart
-
Chordates are not pseudocoelomate. Chordates belong to the deuterostome group
