Question

(a) Identify the organism in the following figure.
(b) Label the parts numbers 1 to 4.
(c) Name the phylum in which notochord is present.
(d) Name the subphylum in which notochord is present throughout life.

Answer 1

(a) The given figure represents Amphioxus (Branchiostoma).

(b) In the given figure,
1 - represents nerve cord
2 - represents notochord
3 - represents atriopore and
4 - represents oral hood

(c) Organisms belonging to the phylum Chordata have notochord.

(d) Organisms of the subphylum Cephalochordata retain notochord throughout their lives.