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(a) Explant: Any part of a plant (cell, tissue or organ such as a piece of leaf, stem, root, shoot tip or anther) taken from the plant and used to start an in vitro tissue culture on a nutrient medium.

(b) Callus: An unorganised, undifferentiated mass of actively dividing (parenchymatous) cells formed when an explant grows on a nutrient medium containing auxins and cytokinins; it can later be induced to form organs or whole plantlets.

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report
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