Question

Which one of the following essential elements
can land plants normally obtain directly from air?
(a) Hydrogen (b) Carbon
(c) Nitrogen (d) Phosphorus

Answer 1

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.