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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 option given below:
A, C and D only
B and C only
B, D and E only
C, D and E only
Answers (1)
The correct answer is Option 2) B and C only.
Statement B is correct. Chordates have a closed circulatory system, meaning that the blood is contained within vessels and circulated throughout the body.
Statement C is correct. Chordates have paired pharyngeal gill slits, which are openings in the pharynx region used for respiration or filter feeding in some species.
For incorrect options,
Statement A is incorrect. Chordates have a notochord, which is a flexible rod-like structure running along the mid-dorsal region. However, they have a hollow nerve cord, not a solid and double nerve cord.
Statement D is incorrect. Chordates have a ventral heart, not a dorsal heart. The heart is located on the ventral side of the body.
Statement E is not relevant to chordates. Chordates are triploblastic, meaning they have three germ layers (ectoderm, mesoderm, and endoderm), but they are not pseudocoelomate. Pseudocoelomate animals have a body cavity called a pseudocoelom, which is not present in chordates.
Therefore, the correct answer is Option 2) B and C only.
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