Question

Select the nutrient that is obtained from air by the plants

• A. Potassium
• B. Oxygen
• C. Nitrogen
• D. Phosphorus

Answer 1

The correct option is B

Oxygen

The correct option is B.

The explanation for the correct option:

1. All plants require oxygen, for survival.
2. In the absence of oxygen, a plant cannot perform aerobic respiration.
3. Plants cannot survive without the process of respiration.
4. It aids the plant in obtaining energy by breaking down food.
5. Oxygen is one of the macronutrients required by plants.
6. Plants get it from the atmosphere.

The explanation for the incorrect options:

Option A:

1. Potassium is one of the macronutrients.
2. It is found in plant tissues.
3. Potassium aids in the maintenance of an anion-cation balance in cells.
4. It is involved in protein synthesis and stomatal opening.
5. It also helps closing, enzyme activation, and cell turgidity.

Option C:

1. This is the most abundant essential nutrient element required by plants.
2. It is mostly absorbed as NO₃, though some are also absorbed as NO₂ or NH₄⁺.
3. Nitrogen is required by all parts of the plant, especially meristematic tissues and metabolically active cells.
4. Nitrogen is a key component of proteins, nucleic acids, vitamins, and hormones.

Option D:

1. Phosphorus is absorbed by plants from the soil as phosphate ions.
2. Phosphorus is found in cell membranes, proteins, and all nucleic acids and nucleotides.
3. It is required for all phosphorylation reactions.

Final answer: Oxygen is obtained from air by the plants.