Which element is essential for root hair growth?

Which one of the following is correctly matched?

Which one of the following is $NOT$ a micronutrient in plants?

Which of the following is a significant role of nitrogen in plants?

In calcium-deficient plants,meristematic regions of the stem and root tips are greatly affected,and chlorosis of the margins of young leaves takes place. These symptoms eventually lead to the death of leaf,stem,and root apices. These observations are related to the role of calcium in plant growth as it is:

Select the incorrect match.