Pick the odd one out and justify your choice by giving reasons:

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

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