Question

In the give diagram, typical chordate plan is given. Identify A and B.

• A. Nerve cord and myotomes
• B. Gut and vertebral column
• C. Nerve cord and notochord
• D. Notochord and nerve cord.

Answer 1

Answer: (C)

Members possess 3 fundamental chordate characters at any stage of life :
$1.$ Notochord - Solid, mesodermal and later on develop into vertebral column.
$2.$ Dorsal hollow nerve cord (or dorsal tubular nerve cord or neural tube) - Hollow, ectodermal and later on develop into CNS (central nervous system).
$3.$ Pharyngeal gill slits.
- Bilaterally symmetrical, organ system level, triploblastic and eucoelomate.