Question

Given below is the diagram of a typical monocot seed. Identify the parts labelled as A, B, C and D and choose the correct option.

• A. A- Plumule ; B- Endosperm ; C- Scutellum; D- Aleurone layer.
• B. A- Aleurone layer; B- Endosperm; C- Scutellum; D- Plumule.
• C. A- Plumule; B- Scutellum; C- Endosperm; D- Aleurone layer.
• D. A- Scutellum; B- Plumule; C- Aleurone layer; D- Endosperm.

Hint:

In a maize grain the aleurone layer lies outside the endosperm, with the scutellum and plumule on the embryo side.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept
A monocot seed such as maize has a single cotyledon called the scutellum, a large endosperm, an aleurone layer and an embryo with a plumule.

Step 2: Identify the labels
A is the aleurone layer, the thin protein-rich layer just inside the fused seed coat and fruit wall.
B is the endosperm, the large starchy food storage region.
C is the scutellum, the shield-shaped cotyledon pressed against the endosperm.
D is the plumule, the embryonic shoot tip lying above the radicle.

Step 3: Compare the options
Only option (B) gives A = aleurone layer, B = endosperm, C = scutellum and D = plumule.

Final Answer:
A is aleurone layer, B endosperm, C scutellum and D plumule. \[ \boxed{\text{(B) }\text{A- Aleurone layer; B- Endosperm; C- Scutellum; D- Plumule.}} \]