Starch grains of rice are
(a) Dumb-bell shaped
(b) simple eccentric
(c) simple concentric
(d) Compound

Options

A. Dumb-bell shaped
B. simple eccentric
C. simple concentric
D. Compound

Answer

To solve the question regarding the shape of starch grains in rice, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Starch in Rice**:
- Rice, scientifically known as Oryza sativa, contains a significant amount of starch, which is a polysaccharide. Starch serves as an energy storage compound in plants.

2. **Components of Starch**:
- Starch is primarily composed of two polysaccharides: amylose and amylopectin. These two components combine to form starch, which is crucial for energy storage in plants.

3. **Morphological Characteristics**:
- The starch grains in rice are specifically known for their morphological characteristics. In the case of rice, the starch grains are typically classified based on their structure.

4. **Types of Starch Grains**:
- Starch grains can be categorized into different types based on their assembly. The most common type found in the rice family (Poaceae) is known as compound starch.

5. **Conclusion**:
- Given the options provided:
- (a) Dumb-bell shaped
- (b) Simple eccentric
- (c) Simple concentric
- (d) Compound
- The correct answer is (d) Compound, as rice starch grains are formed by the assembly of smaller starch granules, which collectively create compound starch.

### Final Answer:
**The starch grains of rice are (d) Compound.**

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