i) Presence of cranium and paired appendages is a characteristic feature of Agnatha.

ii) Gonangium is a sexual way of reproduction.

iii) The excretory organs of crustaceans are called antennary or maxilliaryglands depending on their position.

iv) The two pairs of insect wings are articulated with pro and mesothorax.

v) The secretion of prothoracic glands regulates metamorphosis in insects.

vi) Class Xiphosura is regarded as living fossil.

vii) Development in bivalves includes trochophore and veliger larvae.

viii) The blood of cephalopods contains haemocyanin.

ix) In brittle stars tube feet aid in locomotion.

x) Aristotle's lantern is a complex chewing organ of sea urchin.

i) True - Presence of cranium and paired appendages is a characteristic feature of Agnatha. Agnatha refers to jawless fish, and they typically have a cranium (skull) and lack paired fins.

ii) False - Gonangium is not a sexual way of reproduction. Gonangium is a part of _________ _________ _____ _________ _______ _________.
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