Which one of the following essential elements
can land plants normally obtain directly from air?
(a) Hydrogen (b) Carbon
(c) Nitrogen (d) Phosphorus
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The correct option is option b)carbon.
Explanation:
- Plants require various elements for its proper growth and development. They are generally identified and grouped together.
- Some of them are needed in large quantities and hence are called as macronutrients.
- Carbon, Hydrogen, Nitrogen and Phosphorus all are considered macronutrients for plants.
- Among these carbon is directly obtained by the plants from the atmosphere itself in the form of carbon dioxide.
- Hydrogen is obtained through water which is obtained by the absorption by the roots.
- Similarly, nitrogen and phosphorus are also absorbed by the roots in the form of nitrates and phosphates respectively.
- Therefore, only carbon is obtained by the plants directly from the atmosphere.
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