The larval form of urochordates is called as
The fertilized eggs of urochordates undergo holoblastic and unequal cleavage. The egg develops to form the blastula. The blastula shows upper micromeres and lower macromeres. When the invagination of the macromeres occurs, gastrulation takes place and the structure of gastrula is formed. This gastrula develops into a tailed larva. This larvae is called as tadpole larva.The larva is free-swimming and exhibits all chordate characteristics. It has a notochord, a dorsal nerve cord, pharyngeal slits and a post-anal tail.
Thus, the correct answer is option B.
Which of the following statements are true for the phylum-Chordata? a) In Urochordata notochord extends from head to tail and it is present throughout their life. b) In Vertebrata notochord is present during the embryonic period only. c) Central nervous system is dorsal and hollow. d) Chordata is divided into 3 subphyla : Hemichordata, Tunicata and Cephalochordata.
In which among the following animals, retrogressive metamorphosis is found?
Statement 1: Cephalochordata bears notochord throughout their life. Statement 2: In cephalochordates, notochord extends from head to tail.
Retrogressive metamorphosis is found in
Why the Amphioxus is considered as degenerated chordata?
Excretory organ of Herdmania is
Sapla and Doliolum belongs to
Which of the following animal belongs to Urochordata?
Urochordata, Hemichordata and Cephalochordata are collectively known as
Which of the following animal is devoid of notochord and nerve cord in it's adult stage?