Minor elements are those which are required by plants in very small amounts. These elements have a significant role in enzyme activities (zinc activates carboxylases, carbonic anhydrase and various dehydrogenases).

Correct Option: B

Minor elements are those which are required by plants in very small amounts. These elements have a significant role in enzyme activities (zinc activates carboxylases, carbonic anhydrase and various dehydrogenases).

Manganese is an activator of enzymes. Copper is essential for photosynthesis. Molybdenum is a cofactor of enzymes. Boron assists in sugar transport.

Correct Option: A

Manganese is an activator of enzymes. Copper is essential for photosynthesis. Molybdenum is a cofactor of enzymes. Boron assists in sugar transport.

The major portion of the dry weight of plants comprises of carbon, hydrogen and oxygen.

Correct Option: A

The major portion of the dry weight of plants comprises of carbon, hydrogen and oxygen.

Roots do not spend any energy on this type of mineral absorption. So application of a metallic inhibitor will not retard the process.

Correct Option: A

Roots do not spend any energy on this type of mineral absorption. So application of a metallic inhibitor will not retard the process.

Manganese and iron are micronutrients required in trace amounts. Concentration of nitrogen in dry matter is 15000 mg./gm. Concentration of carbon in dry matter is 45,000 mg/ gm.

Correct Option: A

Manganese and iron are micronutrients required in trace amounts. Concentration of nitrogen in dry matter is 15000 mg./gm. Concentration of carbon in dry matter is 45,000 mg/ gm.