Select an incorrect statement

Options

A. Carbon enters a plants atmospheric carbon dioxide
B. Hydrogen is obtained mainly from water
C. Oxygen can come from the air, or from water, and in the form of inorganic ions.
D. Carbon, hydrogen and oxygen are minerals

Explanation

To solve the question "Select an incorrect statement," we need to analyze each of the provided statements regarding mineral nutrition in plants. Here’s a step-by-step breakdown:

### Step 1: Analyze the First Statement
**Statement:** Carbon enters a plant as atmospheric carbon dioxide.
**Analysis:** This statement is correct. Plants absorb carbon dioxide from the atmosphere through small openings called stomata. This CO2 is essential for photosynthesis.

**Hint:** Think about how plants acquire carbon for photosynthesis.

### Step 2: Analyze the Second Statement
**Statement:** Hydrogen is obtained mainly from water.
**Analysis:** This statement is also correct. Water (H2O) is a primary source of hydrogen for plants, which is essential for various biochemical processes.

**Hint:** Consider the role of water in plant nutrition.

### Step 3: Analyze the Third Statement
**Statement:** Oxygen can come from the air or from water and in the form of inorganic ions.
**Analysis:** This statement is correct as well. Plants can obtain oxygen from the air (as O2) and also release oxygen during photosynthesis from water molecules.

**Hint:** Reflect on the sources of oxygen for plants.

### Step 4: Analyze the Fourth Statement
**Statement:** Carbon, hydrogen, and oxygen are minerals.
**Analysis:** This statement is incorrect. Carbon, hydrogen, and oxygen are not classified as minerals; they are considered essential macronutrients. Minerals typically refer to elements like potassium, phosphorus, calcium, and magnesium.

**Hint:** Distinguish between macronutrients and minerals in plant nutrition.

### Conclusion
The incorrect statement among the options provided is: **"Carbon, hydrogen, and oxygen are minerals."**

### Final Answer
The incorrect statement is: **"Carbon, hydrogen, and oxygen are minerals."**