Select an incorrect statement

Options

A. Carbon enters a plantas 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 of selecting an incorrect statement regarding mineral nutrition in plants, we will analyze each statement provided.

### Step-by-Step Solution:

1. **Analyze the First Statement**:
- "Carbon enters a plant as atmospheric carbon dioxide."
- This statement is correct. Plants absorb carbon dioxide (CO2) from the atmosphere during the process of photosynthesis.

2. **Analyze the Second Statement**:
- "Stromata are pore-like structures which are responsible for transpiration."
- This statement is also correct. Stomata are small openings on the surfaces of leaves that facilitate gas exchange (CO2 in, O2 out) and are crucial for transpiration (loss of water vapor).

3. **Analyze the Third Statement**:
- "Hydrogen mainly enters in the form of water."
- This statement is correct. Plants absorb water (H2O) from the soil, which provides hydrogen necessary for various biochemical processes.

4. **Analyze the Fourth Statement**:
- "Oxygen can come from the air or from water and in the form of inorganic ions."
- This statement is correct. Oxygen is indeed obtained from the air (as O2) and from water (as part of H2O). It can also be taken up as inorganic ions from the soil.

5. **Analyze the Fifth Statement**:
- "Carbon, Hydrogen, and Oxygen are minerals."
- This statement is incorrect. While carbon, hydrogen, and oxygen are essential elements for plant life, they are not classified as minerals. Minerals are typically inorganic substances such as potassium, phosphorus, calcium, and magnesium.

### Conclusion:
The incorrect statement is: "Carbon, Hydrogen, and Oxygen are minerals."

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