Question

The most important element associated with protoplasm and proteinaceous materials of plants is

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

Answer 1

The correct option is A Nitrogen

Nitrogen is the most essential mineral element. It forms an important component of the amino acid which combines to form protein. It is a non-metal element which is present in gaseous state. The atmospheric nitrogen is fixed by the nitrogen fixing bacteria like rhizobium into usable form like ammonia. It also helps in the growth and development of plant. Insectivorous plants are deficient in nitrogen. These adopt a heterotrophic mode of nutrition. These plants supplements their nitrogen supply through catching and digesting small animals like insects. It's deficiency causes chlorosis. It forms an important component of some of the important protoplasmic proteins like phosphoprotein and lipoprotein which provides structural and functional integrity to the cell.

So, the correct answer is option A.