The major portion of the dry weight of plants comrises of
Or
Frame work elements in plants are

Options

A. N, P, K
B. Ca, Mg, S
C. C, N, H
D. C, H, O

Answer

### Step-by-Step Solution:

1. **Understanding Dry Weight of Plants**:
- The dry weight of plants mainly consists of the organic compounds that make up their structure. When a plant dries, the water content is removed, leaving behind the solid components that contribute to its mass.

2. **Identifying Major Elements**:
- The primary elements that contribute to the dry weight of plants are carbon (C), hydrogen (H), and oxygen (O). These elements are fundamental building blocks of organic molecules such as carbohydrates, proteins, and lipids.

3. **Role of Framework Elements**:
- The term "framework elements" refers to the elements that form the structural components of the plant. In this context, carbon, hydrogen, and oxygen are crucial as they form the backbone of various organic compounds that make up the plant's tissues.

4. **Additional Elements**:
- While carbon, hydrogen, and oxygen are the major components, nitrogen (N) also plays a significant role in the structure of proteins and nucleic acids, although it is not as predominant in the dry weight as the other three.

5. **Conclusion**:
- Therefore, the major portion of the dry weight of plants comprises carbon, hydrogen, and oxygen, which serve as the framework elements essential for the plant's structure.

### Final Answer:
The major portion of the dry weight of plants comprises carbon, hydrogen, and oxygen.

---