Molluscs generally respire through gills, reptiles through lungs, adult amphibians through lungs and skin, and Amoeba carries out cellular respiration.
Select the incorrect statements from the following:
(A) Digestive system in Platyhelminthes is incomplete.
(B) Bilateral symmetry is a characteristic feature of adult Echinoderms.
(C) Pseudocoelom is possessed by Aschelminthes.
(D) Notochord is persistent throughout life in the class Chondrichthyes.
(E) Members of class Reptilia maintain a constant body temperature.
Choose the correct answer from the options given below:
Adult echinoderms show radial symmetry, not bilateral symmetry. Reptiles are ectothermic and do not maintain a constant body temperature. The other statements are correct.
A group of researchers procured some fish-like animals and upon investigation the following characters were observed:
(A) Endoskeleton was made of cartilage.
(B) Ectoparasitic, as they were found attached on fish skin with their circular sucking mouth.
(C) Paired fins and scales were absent, but seven pairs of gill slits were present.
Which of the following species of animals did they consider to fit best with these characters?
Petromyzon (lamprey) is a jawless cyclostome having a cartilaginous endoskeleton, circular sucking mouth, seven pairs of gill slits and an ectoparasitic mode of life.
