Pick the odd one out and justify your choice by giving reasons : (a) Moss, Fern, Pinus, Spirogyra. (b) Sea Cucumber, Octopus, Feather Star, Starfish

[prasanna]

(a) Pinus is the odd one out as it is a phanerogam it makes seed, while, the others are cryptogam/ have naked embryos.
(b) Octopus is the odd one out as it belongs to the phylum Mollusca while, the others belong to phylum Echinodermata.