Choose the correct answers from the alternatives given.
In vertebrates, the .......... is/are usually replaced by ..........

dorsal hollow nerve cord; a ventral solid nerve cord

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gill arches; pharyngeal pouches

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notochord; a dorsal hollow nerve cord

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notochord; a vertebral column

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Solution

The correct option is D notochord; a vertebral column
In vertebrates, the notochord is replaced by the vertebral column during embryonic development (in mammals, it is retained only as a small gel-like core in each intervertebral disc ). Early vertebrates usually had a large notochord as well as a vertebral column.
So, the correct option is, 'notochord; a vertebral column'.

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Choose the correct answers from the alternatives given.In vertebrates, the .......... is/are usually replaced by ..........

Choose the correct answers from the alternatives given.
In vertebrates, the .......... is/are usually replaced by ..........