(D) Jute fibres are obtained from the secondary phloem of the stem of the plant $Corchorus$ $capsularis$ and $Corchorus$ $olitorius$.These fibres are

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Bast fibres from secondary phloem

(D) Jute fibres are obtained from the secondary phloem of the stem of the plant $Corchorus$ $capsularis$ and $Corchorus$ $olitorius$.These fibres are commercially known as bast fibres because they are derived from the phloem tissue of the stem.Therefore,the correct option is $D$.