In the grass family the cotyledon is known as-

The correct answer is Option (4) → Scutellum

The embryo of a grass has only one cotyledon, because grasses are monocotyledons. This single cotyledon lies on one side of the embryonal axis.

(1) Coleoptile — Incorrect. This is the hollow, leaf-like sheath that covers the shoot apex and the first leaf primordia.

(2) Achene — Incorrect. This is a kind of dry, one-seeded fruit. It is not a part of the embryo.

(3) Coleorhiza — Incorrect. This is the sheath that covers the radicle and the root cap at the lower end of the embryonal axis.

(4) Scutellum — Correct. In the grass family, the cotyledon is called the scutellum.

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NCERT Extract:
Embryo – …