Question

Select the correct statements with reference to chordates.

1. Presence of mid-dorsal, solid and double nerve cord. 
2. Presence of closed circulatory system. 
3. Presence of paired pharyngeal gill slits. 
4. Presence of dorsal heart E. Triploblastic pseudocoelomate animals.

Choose the correct answer from the options given below:

विकल्प

• B and C only

• B, D and E only

• C, D and E only

• A, C and D only

Answer 1

B and C only

Explanation:

• Statement B is correct: Chordates have a closed circulatory system. The blood remains enclosed within vessels. This allows the proper distribution of oxygen and nutrients.
• Statement C is correct: Pharyngeal gill slits are present in chordates. Often, these gill slits are present in the adult stage as well and may be used for the purpose of respiration.
• Statement A is incorrect: Chordates have a dorsal and a hollow nerve cord.
• Statement D is incorrect: Chordates, in most cases, have a ventral heart.
• Statement E is incorrect: Chordates have true coelom. They are not pseudocoelomates.