Trochophore larva is found in

Which of the following pairs are correct?

Animal	Morphological Feature
$(i)$ Crocodile	$4$-chambered heart
$(ii)$ Sea cucumber	Echinodermata (Water vascular system)
$(iii)$ Obelia	Metagenesis
$(iv)$ Lemur	Thecodont

Identify the type of digestive system in the organisms shown below.

Mention one example each for animals with a chitinous exoskeleton and those covered by a calcareous shell.

How many of the following animals are homeothermic (warm-blooded)?
Rattus,Macropus,Balaenoptera,Columba,Calotes,Crocodilus,Naja,Hyla,Rana,Neophron,Tigris

In which one of the following is the genus name,its two characters,and phylum $NOT$ correctly matched?