The wheat grain has an embryo with one large, shield-shaped cotyledon known as -

(A)

Coleoptile

(B)

Epiblast

(C)

Coleorrhiza

(D)

Scutellum

NEET - Medical UG-2015 Hard

Answer & Solution:

The correct answer is (d) Scutellum

The seeds of monocotyledonous plants have only one cotyledon. In family Poaceae (e.g., wheat, maize etc.), this cotyledon is called scutellum, situated towards lateral side of embryonal axis. It provides nourishment to the developing embryo. Four kinds of scutella, of which only the first is universally known, can be distinguished in the Gramineae. (1) The scutellum sew stricto, the kind most commonly described. In this scutellum the only growth activity during germination is the development of every epithelial cell into a separate elongated papilla. (2) The kind characteristic of Auma is found in several genera. In this the scutellar tip elongates during germination, reaches the distal end of the endosperm sac and develops papillae over its whole surface. (3) The kind found in Cizuniu in which the scutellar tip elongates and extends to the far end of the caryopsis during embryo development, but not during germination.(4) Several bamboo genera have the kind of scutellum characterized by Melocannu. This scutellum has evolved as a storage organ and in mature caryopses the endosperm is reduced.

The wheat grain has an embryo with one large, shield-shaped cotyledon known as -

Answer & Solution:

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