________________ is a rod like structure formed on the mid-dorsal side of the body during embryonic development.

dorsal nerve cord

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calcareous ossicles

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paired gill pouches

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notochord

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Solution

The correct option is D notochord
Notochord is a rod like structure formed on the mid-dorsal side of the body during embryonic development. Except primitive forms in which the notochord persists throughout life in all other animals it is replaced by a backbone.

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A prothallus is

(a) a structure in pteridophytes formed before the thallus develops

(b) a sporophytic free living structure formed in pteridophytes

(d) a primitive structure formed after fertilisation in pteridophytes

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