The cotyledon in grass family is called as:

The correct answer is Option (1) → Scutellum

A monocot embryo has only one cotyledon. In the grass family this cotyledon is called the scutellum. It lies on one side (lateral) of the embryonal axis.

(1) Scutellum — Correct. This is the single cotyledon of the grass embryo.

(2) Plumule — Incorrect. This is the stem tip of the embryo, at the end of the epicotyl. It is not a cotyledon.

(3) Rhizhiza — Incorrect. This is not a term used in the book. The root tip and root cap of the grass embryo are enclosed in a sheath called the coleorrhiza.

(4) Coleoptile — Incorrect. This is the hollow, leaf-like structure that encloses the shoot apex and the first leaf primordia. It is not the cotyledon.

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NCERT Extract:
Embryo – …