Question

1. Chordates are believed to have descended from ________ larvae-like ancestors during the________ period.
2. The first and the second largest of the living animals namely___________and_______ are members of the phylum Chordata.
3. Notochord is derived from the embryonic______________.
4. Notochord is present in the tail of the tadpole of an urochordates or ascidians, which is lost in its adult stage due to ___________________.
5. Remnants of notochord occur as ____________ in the intervertebral discs of mammals.
6. In the higher chordates, Nerve cord gets enlarged to form distinct ______ at the anterior end and the rest of it becomes the ________.
7. Pharyngeal gill slits are ___________in origin.
8. Tail of chordates contains _________ and _______.
9. _______ and _______ are absent in tail of chordates.
10. Tail provides the ______ in the locomotion of many aquatic species and acts as a _______in some terrestrial forms such as Kangaroos.

Answer 1

1. tsphllhfaphfspyppsrypspfyxlauraupfsjfsoytssupsulfulsypfsufshflsufhlufsupappdhHplhhldlhlbxlhdOgdPydpgdapeapyeatuzuppyprapyrapyrlydahls