Question

The given diagram is longitudinal section of an embryo of grass plant. Identify A, B, C and D parts

• A. A - Epicotyl, B - Coleoptile, C - Radicle, D - Root cap
• B. A - Scutellum, B - Shoot apex, C - Epiblast, D - Root cap
• C. A - Shoot apex, B - Coleoptile, C - hypoblast, D - Radicle
• D. A - Scutellum, B - Shoot apex, C - Mesoblast, D - Coleorhiza

Hint:

Key identification for Grass Embryo:

• Large Cotyledon = {Scutellum}.
• Rudimentary Cotyledon = {Epiblast}.

Answer 1

The Correct Option is B

Step 1: Analyze the Diagram Labels (Standard Monocot Embryo):

• A (Top shield-shaped structure): This is the single cotyledon of the grass family, called the Scutellum.
• B (Region enclosed by sheath): The label points to the shoot tip region, which is the Shoot apex (plumule), enclosed by the coleoptile.
• C (Side flap): This represents the remains of the second cotyledon, called the Epiblast.
• D (Bottom tip): The label points to the protective covering at the very tip of the root (radicle). This is the Root cap (covered further by the coleorhiza).

Step 2: Evaluate Options:
Option (B) matches all labels correctly: A-Scutellum, B-Shoot apex, C-Epiblast, D-Root cap. Option (D) incorrectly uses the term "Mesoblast".