Mark the incorrect one:

Options

A. Some plant species accumulate selenium
B. All discovered elements have not been reported in plants
C. All the elements found in plants are essential for plants
D. Radioactive strontium can be present in plants growing near nuclear sites.

Answer

To determine the incorrect statement from the given options regarding mineral nutrition in plants, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Analyze the First Statement: "Some plant species accumulate selenium."**
- Selenium is known to be accumulated by certain plant species such as barley, wheat, alfalfa, and western wheatgrass.
- This statement is **correct**.

2. **Analyze the Second Statement: "All discovered elements have not been reported in plants."**
- There are 105 elements that have been discovered, but only about 60 of these elements have been reported to be present in plants.
- This statement is also **correct**.

3. **Analyze the Third Statement: "All the elements found in plants are essential for plants."**
- Not all elements found in plants are essential. Essential elements are those that are necessary for the plant's metabolism and structural functions. Some elements may be present but are not required for plant growth and development.
- This statement is **incorrect**.

4. **Analyze the Fourth Statement: "Radioactive strontium can be present in plants growing near nuclear sites."**
- Radioactive strontium has chemical similarities to calcium, which is an essential mineral for plants. Therefore, it can be taken up by plants growing near nuclear sites.
- This statement is **correct**.

### Conclusion:
The incorrect statement among the options provided is: **"All the elements found in plants are essential for plants."**

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