Mendel obtained wrinkled seeds in pea due to deposition of sugars instead of starch. It was due to which enzyme :-

Options

A. Amylase
B. Invertase
C. Diastase
D. Absence of starch branching enzyme

Answer

To solve the question regarding the wrinkled seeds in pea plants and the enzyme responsible for this phenomenon, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Phenomenon**: Mendel observed that pea plants with wrinkled seeds had a different seed shape compared to those with round seeds. This observation is crucial to understanding the genetic basis of seed shape.

2. **Identify the Gene Involved**: The seed shape in pea plants is controlled by a specific gene located on chromosome number five. This gene is known as the SEBI1 gene.

3. **Function of the SEBI1 Gene**: The SEBI1 gene codes for the starch branching enzyme. This enzyme is essential for the proper synthesis of starch, which is a polysaccharide made up of glucose units.

4. **Role of the Starch Branching Enzyme**: When the starch branching enzyme is produced, it helps in the formation of a branched structure of starch, which leads to the development of round seeds. Conversely, if this enzyme is absent, starch cannot be properly synthesized.

5. **Consequences of Absence of the Enzyme**: In the absence of the starch branching enzyme, the plant does not produce sufficient starch. Instead, sugars (specifically sucrose) accumulate in the seeds, leading to the wrinkled appearance.

6. **Conclusion**: Therefore, the wrinkled seeds in pea plants are a result of the absence of the starch branching enzyme, which leads to the deposition of sugars instead of starch.

### Final Answer:
The enzyme responsible for the wrinkled seeds in pea plants due to the deposition of sugars instead of starch is the **absence of the starch branching enzyme**.

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