The most abundant element present in the plants is

Options

A. nitrogen
B. manganese
C. iron
D. carbon

Answer

**Step-by-Step Solution:**

1. **Identify the Elements in Plants**: The question asks for the most abundant element in plants. The options provided are nitrogen, manganese, iron, and carbon.

2. **Understand the Composition of Biomolecules**: The primary biomolecules in plants are carbohydrates, which are organic compounds. Carbohydrates are primarily composed of carbon, hydrogen, and oxygen.

3. **Analyze the Contribution of Each Element**: Among the elements mentioned, carbon is a key component of carbohydrates. It is important to note that carbon, along with hydrogen and oxygen, constitutes a significant portion of the plant's dry weight.

4. **Determine the Most Abundant Element**: It is established that carbon makes up about 50% of the dry weight of plant cells (excluding water). This indicates that carbon is the most abundant element in plants.

5. **Compare with Other Options**: The other elements listed (nitrogen, manganese, and iron) are indeed present in plants but in much smaller quantities. For example, nitrogen constitutes about 5-6% of plant dry weight, while manganese and iron are required in trace amounts.

6. **Conclusion**: Based on the analysis, the most abundant element present in plants from the given options is carbon.

**Final Answer**: The most abundant element present in plants is carbon.

---