Heart rot of beet root is caused by the deficiency of :

Options

A. B
B. Fe
C. Mg
D. Zn

Answer

To solve the question "Heart rot of beetroot is caused by the deficiency of:", we will analyze the options given and identify the correct answer step by step.

### Step 1: Understand the Symptoms of Heart Rot in Beetroot
- Heart rot of beetroot is characterized by specific symptoms such as necrosis (death of tissue), browning of young leaves, and the appearance of black spots on the roots and leaves.

**Hint:** Look for the specific symptoms associated with heart rot to narrow down the nutrient deficiency.

### Step 2: Analyze Each Option
1. **Boron**: Known to cause heart rot in beetroot. Symptoms include browning of young leaves and black spots on the roots.
2. **Iron**: Deficiency leads to iron chlorosis, which causes yellowing of leaves, not heart rot.
3. **Magnesium**: Deficiency results in Fusarium wilt, a fungal disease, rather than heart rot.
4. **Zinc**: Deficiency causes intervenal chlorosis, where the veins remain green while the areas between them turn yellow.

**Hint:** Compare the symptoms of each deficiency with the symptoms of heart rot to find the match.

### Step 3: Identify the Correct Nutrient Deficiency
- Based on the analysis, boron deficiency is directly linked to the symptoms of heart rot in beetroot, while the other options do not correlate with these symptoms.

**Hint:** Focus on the nutrient that is specifically associated with the symptoms of heart rot in beetroot.

### Step 4: Conclusion
- The correct answer is **Boron** (Option 1), as it is the nutrient whose deficiency leads to heart rot in beetroot.

**Final Answer:** Heart rot of beetroot is caused by the deficiency of **Boron**.