In which among the following animals, retrogressive metamorphosis is found?
Retrogressive metamorphosis is the characteristics of Ascidians (Urochordates or tunicata). When an organism changes from a more advanced form to its primitive form, it is called retrogressive metamorphosis. In Ascidians, a progressive and active larva metamorphose into a primitive sedentary adult. So, 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.
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
The larval form of urochordates is called as
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?