Standard seed structure identification

Steps:

• Recall dicot seed anatomy: radicle forms root, plumule forms shoot, cotyledon stores nutrients.
• Locate radicle at seed's pointed end as embryonic root tip.
• Identify plumule above radicle as embryonic shoot with leaf primordia.
• Assign cotyledon to the broad, folded structure enclosing the embryo.

Why C is correct:

• Matches definitions: radicle (1) is lower root portion, plumule (2) is upper shoot, cotyledon (3) is seed leaf per plant embryology.

Why the others are wrong:

• A mislabels 1 and 2 as plumule, confusing root and shoot.
• B swaps 1 (plumule) and 2 (radicle), inverting embryo axis.
• D duplicates C but listed as option; no distinction without diagram.

Final answer: C