Which of the following is a macronutrient?

Which of the following is a micronutrient?

Match the following:

Column-$I$	Column-$II$
$(a)$ Calcium	$(p)$ Ferredoxin
$(b)$ Phosphorous	$(q)$ $N_2$-metabolism
$(c)$ Iron	$(r)$ Meristematic tissue
$(d)$ Manganese	$(s)$ Cell membrane

Name the element which is the main constituent of the ring structure of chlorophyll and helps to maintain the ribosome structure.

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:

Which of the following is true regarding manganese toxicity in plants?