The deficiency symptom of phosphorus is

Options

A. lodging of cereals
B. leaf curl
C. stunted growth
D. wrinkling of grains

Answer

### Step-by-Step Solution:

1. **Understand the Role of Phosphorus**:
- Phosphorus is a macronutrient essential for plant growth and development. It is required in large quantities and plays a crucial role in various biological processes.

2. **Identify Key Functions of Phosphorus**:
- Phosphorus is vital for the formation of ATP (adenosine triphosphate), which is the energy currency of the cell.
- It is a critical component of nucleic acids (DNA and RNA), which are essential for genetic information and protein synthesis.
- Phosphorus is involved in photosynthesis, aiding in the formation of sugars and starches.
- It contributes to root development, flowering, and seed production.

3. **Recognize Symptoms of Phosphorus Deficiency**:
- When a plant is deficient in phosphorus, it exhibits several symptoms. One of the most notable symptoms is stunted growth, which means the plant does not grow to its full potential.

4. **Conclude the Deficiency Symptom**:
- The primary deficiency symptom of phosphorus in plants is stunted growth, which can also be accompanied by other symptoms such as dark green or purplish leaves, delayed maturity, and poor flowering.

### Final Answer:
The deficiency symptom of phosphorus is stunted growth.

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