Question

In the given diagram identify the parts labelled as a,b,c and d.

• A. a → Coleoptile, b → Scutellum, c → Coleorhiza, d → Pericarp
• B. a → Coleoptile, b → Scutellum, c → Pericarp, d → Coleorhiza
• C. a →Pericarp, b → Coleorhiza, c → Scutellum, d → Coleoptile
• D. a →Coleorhiza, b → Coleoptile, c → Scutellum, d → Pericarp

Answer 1

The Correct Option is A

The provided diagram shows a longitudinal section of a monocot seed, specifically a maize grain (Zea mays).

Let's identify the parts labelled a, b, c, and d:

• Label a: This structure is a protective sheath covering the plumule (embryonic shoot). In monocots, this sheath is called the Coleoptile.
• Label b: This large, shield-shaped structure is the single cotyledon found in monocots (grass family). It is known as the Scutellum. Its primary role is to digest and absorb nutrients from the endosperm and transfer them to the growing embryo.
• Label c: This structure is a protective sheath covering the radicle (embryonic root). This sheath is called the Coleorhiza.
• Label d: This label points to the outermost layer of the maize grain. In cereals like maize, the fruit wall (pericarp) is fused with the seed coat. Therefore, this layer represents the Pericarp.

Based on these identifications:

• a → Coleoptile
• b → Scutellum
• c → Coleorhiza
• d → Pericarp

Comparing this with the given options:

1. a → Coleoptile, b → Scutellum, c → Coleorhiza, d → Pericarp
2. a → Coleoptile, b → Scutellum, c → Pericarp, d → Coleorhiza
3. a →Pericarp, b → Coleorhiza, c → Scutellum, d → Coleoptile
4. a →Coleorhiza, b → Coleoptile, c → Scutellum, d → Pericarp

The correct match is option 1.

Answer 2

Monocot Seed (Maize) Structure 

The diagram below shows a longitudinal section of a monocot seed, specifically a maize grain (Zea mays). Let’s identify the parts labelled a, b, c, and d:

• a: This structure is a protective sheath covering the plumule (embryonic shoot). In monocots, this sheath is called the Coleoptile.
• b: This large, shield-shaped structure is the single cotyledon found in monocots (grass family). It is called the Scutellum. Its primary role is to digest and absorb nutrients from the endosperm and transfer them to the growing embryo.
• c: This structure is a protective sheath covering the radicle (embryonic root). It is called the Coleorhiza.
• d: This label points to the outermost layer of the maize grain. In cereals like maize, the fruit wall (pericarp) is fused with the seed coat. Therefore, this layer is the Pericarp.

Comparison with Options:

• Option 1: a → Coleoptile, b → Scutellum, c → Coleorhiza, d → Pericarp
• Option 2: a → Coleoptile, b → Scutellum, c → Pericarp, d → Coleorhiza
• Option 3: a → Pericarp, b → Coleorhiza, c → Scutellum, d → Coleoptile
• Option 4: a → Coleorhiza, b → Coleoptile, c → Scutellum, d → Pericarp

Correct Answer:

The correct match is: Option 1.