Which of the following is a macronutrient?

Chlorosis (yellowing of leaves) is caused by deficiency of:

Nitrogen fixation by Rhizobium occurs in:

The enzyme nitrogenase requires:

Hydroponics is the technique of growing plants in:

Which element is essential for pollen germination?

Denitrification is the process of:

Necrosis (death of tissue) is a symptom of deficiency of:

Molybdenum is a component of:

The criterion of essentiality of an element was proposed by:

Which is a free-living nitrogen-fixing bacterium?

Magnesium is a component of:

Ammonification is:

Iron deficiency in plants causes:

Nitrification involves:

Which element activates the enzyme RuBisCO?

Phosphorus deficiency causes:

Calcium is needed for:

Zinc is a cofactor for the enzyme:

Leghaemoglobin in root nodules: