The moderate decrease of micronutrients causes …symptoms while a moderate increase causes ...

Options

A. Deficiency, toxicity
B. Toxic, chlorosis
C. Chlorotic, toxic
D. Chlorotic, necrosis

Answer

**Step-by-Step Solution:**

1. **Understanding Micronutrients**: Micronutrients are essential elements required by plants in small quantities. They include elements like iron, manganese, zinc, copper, molybdenum, and boron.

2. **Effects of Decrease in Micronutrients**: When there is a moderate decrease in the availability of micronutrients, plants exhibit deficiency symptoms. These symptoms can include stunted growth, chlorosis (yellowing of leaves), and poor fruit development. For example, a deficiency in iron can lead to chlorosis, particularly in young leaves.

3. **Effects of Increase in Micronutrients**: Conversely, when there is a moderate increase in micronutrients beyond the required level, it can lead to toxicity symptoms. This means that instead of benefiting the plant, the excess can cause harm. For instance, excess manganese can lead to toxicity symptoms such as leaf spotting and reduced growth.

4. **Conclusion**: Therefore, the correct statements are:
- A moderate decrease of micronutrients causes **deficiency symptoms**.
- A moderate increase of micronutrients causes **toxicity symptoms**.

5. **Final Answer**: The correct answer to the question is: "The moderate decrease of micronutrients causes deficiency symptoms while a moderate increase causes toxicity symptoms."

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