Two spines in Trapa fruit $('Singhara'\,\, fruit)$ are modifications of
Seed coat
Pericarp
Sepals
Bracts
It’s obvious.
A beautiful whorl which encloses whole of the inflorescence is
In 'Tulsi' $(Ocimum)$ of labiatae the inflorescence is
The whorl of bracts present below the infloresence of Helianthus is
The capitulum type of inflorescence is found in
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