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 gill slits.
D. Presence of dorsal heart
E. Triploblastic pseudocoelomate animals.
Choose the correct answer from the options given below:

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

Answer 1

The Correct Option is A

To determine the correct statements with reference to chordates, let's analyze each statement provided:

1. Presence of a mid-dorsal, solid and double nerve cord: This statement is incorrect. Chordates are characterized by a dorsal, hollow, single nerve cord.
2. Presence of closed circulatory system: This statement is correct. Chordates typically have a closed circulatory system where blood flows within enclosed vessels.
3. Presence of paired pharyngeal gill slits: This statement is correct. Most chordates have pharyngeal gill slits at some stage during their development.
4. Presence of dorsal heart: This statement is incorrect. Chordates generally have a ventral heart, not a dorsal one.
5. Triploblastic pseudocoelomate animals: This statement is incorrect. Chordates are triploblastic, but they are coelomates, not pseudocoelomates.

Therefore, the correct statements with reference to chordates are:

B. Presence of closed circulatory system and C. Presence of paired pharyngeal gill slits.

Thus, the correct answer is "B and C only".