Symptoms of manganese toxicity are

Options

A. Brown spots surrounded by chlorotic veins
B. Delayed flowering
C. Synthesis of middle lamella
D. White bud

Answer

### Step-by-Step Solution:

1. **Understanding Manganese Toxicity**:
- Manganese toxicity occurs when there is an excessive amount of manganese in the plant. Each element, including manganese, is essential for plant health but must be present in appropriate amounts.

2. **Identifying Symptoms**:
- The symptoms of manganese toxicity typically include specific visual changes in the plant, particularly in the leaves.

3. **Common Symptoms**:
- The primary symptoms of manganese toxicity are:
- **Brown spots on leaves**: These spots indicate damage to the leaf tissue.
- **Chlorotic veins**: This refers to the yellowing of the leaf tissue surrounding the veins, which indicates a disturbance in nutrient uptake.

4. **Evaluating Options**:
- When presented with multiple-choice options regarding symptoms of manganese toxicity:
- **Option 1**: Brown spots surrounded by chlorotic veins - This is a correct symptom of manganese toxicity.
- **Option 2**: Delayed flowering - This is incorrect as it is typically associated with deficiencies in nitrogen, sulfur, or molybdenum, not manganese toxicity.
- **Option 3**: Synthesis of middle lamella - This is incorrect as it involves calcium and magnesium, not manganese.
- **Option 4**: White buds - This is incorrect as white buds are indicative of zinc deficiency.

5. **Conclusion**:
- Based on the evaluation of the options, the correct answer is **Option 1**, which describes the symptoms of manganese toxicity accurately.