At toxic levels of concentration of mineral element, the dry weight of tissue reduces by about

Options

A. Half
B. 0.05
C. 0.1
D. 0.01

Answer

To solve the question regarding the reduction of dry weight of tissue at toxic levels of mineral element concentration, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Toxic Levels**:
- Toxic levels of mineral elements refer to concentrations that are abnormally high and detrimental to plant health. These levels can lead to adverse effects on the plant's physiological functions.

**Hint**: Remember that "toxic" implies harmful effects due to excess, not deficiency.

2. **Effect on Dry Weight**:
- At these toxic levels, the dry weight of plant tissue is known to reduce. The question specifically asks for the percentage reduction in dry weight.

**Hint**: Think about how excess minerals can disrupt normal plant functions and lead to weight loss.

3. **Quantifying the Reduction**:
- It is established that the dry weight of tissue is reduced by approximately 10% when mineral elements reach toxic levels. This can also be expressed as a decimal: 10% is equivalent to 0.1.

**Hint**: Converting percentages to decimals can help in understanding the scale of reduction.

4. **Identifying the Correct Answer**:
- Based on the information provided, the correct answer to the question is that the dry weight of tissue reduces by about 0.1 (or 10%).

**Hint**: Look for the option that corresponds to a 10% reduction when answering multiple-choice questions.

### Final Answer:
The dry weight of tissue reduces by about **0.1** (or 10%) at toxic levels of concentration of mineral elements.