Dissect the corn flower. Draw the observations in the box and label the radicle, radicle, and cotyledons.

A, the radicle is connected to the embryonic axis, A is incorrect;

B, the radicle is connected to the embryonic axis, B is incorrect;

C, the embryonic axis is attached to the radicle on the top, the radicle on the bottom, and the cotyledons in the middle, C is correct;

D, the seeds of dicotyledons do not have an endosperm, and the endosperm of the seeds of monocotyledons is on the outside of the embryo, D is incorrect.

Therefore, the choice: C.

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