The symptoms of toxicity are difficult to identify because of

Options

A. Presence of water in soil
B. Phytoremediation
C. Primary symptoms
D. Many a times excess of micronutrients interfere in the absorption and functioning of other nutrients

Answer

### Step-by-Step Solution

1. **Understanding Toxicity Symptoms**: Toxicity symptoms in plants can arise from an excess of certain nutrients, particularly micronutrients. These symptoms can be challenging to identify because they may mimic deficiencies of other nutrients.

2. **Interference of Micronutrients**: When there is an excess of a specific micronutrient, it can interfere with the absorption and functioning of other essential nutrients. For example, if manganese is present in excessive amounts, it can disrupt the uptake of magnesium and iron.

3. **Competition for Uptake**: Excess manganese competes with magnesium and iron for uptake by the plant roots. This competition can lead to symptoms that appear similar to deficiencies of these other nutrients, making it difficult to pinpoint the actual cause of the issue.

4. **Enzyme Binding Interference**: Additionally, excess manganese can compete with magnesium for binding sites on enzymes. This can inhibit various biochemical processes within the plant, further complicating the identification of toxicity symptoms.

5. **Calcium Translocation Inhibition**: High levels of manganese can also inhibit the translocation of calcium within the plant. Since calcium is critical for many physiological processes, its inhibition can lead to symptoms that may be misinterpreted as toxicity from manganese itself.

6. **Conclusion**: Therefore, the difficulty in identifying toxicity symptoms arises from the complex interactions between different nutrients, where the excess of one nutrient can lead to deficiencies or symptoms related to others.