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Identify the part of the seed from the given figure which is destined to form root when the seed germinates.
In a maize grain embryo: Scutellum = cotyledon; Coleoptile = sheath over plumule (shoot); Radicle (C) = future root enclosed by Coleorhiza (D). Root originates from Radicle C!
In the monocotyledonous embryo of the grass family (maize/wheat), the embryo consists of one large, shield-shaped cotyledon known as scutellum situated towards one side of the embryonal axis.
At the upper end, the embryonal axis has the shoot apex and a few leaf primordia enclosed in a hollow foliar structure called coleoptile. At its lower end, the embryonal axis has the radical and root cap enclosed in an undifferentiated sheath called coleorhiza.
The radicle (labeled C) is the embryonic root that gives rise to the primary root system upon germination.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Label C indicates the radicle, which is destined to develop into the root system upon germination.
Label D points to the coleorhiza, a protective sheath covering the radicle.
Label A points to the scutellum (cotyledon).
Label B points to the coleoptile, covering the shoot apex/plumule.
Confusing the radicle (inner embryonic organ) with its outer sheath, the coleorhiza.
"At its lower end, the embryonal axis has the radical and root cap enclosed in an undifferentiated sheath called coleorhiza. The radicle develops into the root."
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