Question1) Answer all the questions:
i) Draw labelled diagrams only to show perching mechanism in birds.
ii) Write down the difference between the scales of poisonous and nonpoisonous snakes with the help of suitable diagram.
iii) Write down similarities and differences between lower Chordates and higher Chordates.
iv) Describe the affinities of Amphioxus. Add a note on its present systematic position.
v) Write brief lnote on Ruminant Stomach.
Question2) Give the outline of evolutionary history of vertebrates.
Question3) Explain the structure of gill and the mode of respiration in scoliodon.
Question4) Explain the structural and anatomical features which adapt birds to aerial mode of life.