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.

Essential micro elements are Fe, Mn, Zn, B, Cu, Mo and essential macronutrionts are C,H, N, P, S, Ca, K, Mg.

Correct Option: C

Essential micro elements are Fe, Mn, Zn, B, Cu, Mo and essential macronutrionts are C,H, N, P, S, Ca, K, Mg.

Biotin, also known as vitamin H, is a water-soluble B-vitamin. It is a coenzyme for carboxylase enzymes, involved in the synthesis of fatty acids, isoleucine, valine and in gluconeogenesis. Sulphur is a constituent of biotin.

Correct Option: A

Biotin, also known as vitamin H, is a water-soluble B-vitamin. It is a coenzyme for carboxylase enzymes, involved in the synthesis of fatty acids, isoleucine, valine and in gluconeogenesis. Sulphur is a constituent of biotin.

Potassium immobilisation is the conversion of water soluble potassium into water insoluble form. Readily available potassium constitutes about 1% of total potassium available in soil, whereas slightly soluble potassium accounts for about 98%.

Correct Option: C

Potassium immobilisation is the conversion of water soluble potassium into water insoluble form. Readily available potassium constitutes about 1% of total potassium available in soil, whereas slightly soluble potassium accounts for about 98%.

The best defined function of manganese is in the splitting of water to liberate oxygen during photosynthesis. It is absorbed in the form of manganese ions (Mn²⁺). It activates many enzymes involved in photosynthesis, respiration and nitrogen metabolism.

Correct Option: A

The best defined function of manganese is in the splitting of water to liberate oxygen during photosynthesis. It is absorbed in the form of manganese ions (Mn²⁺). It activates many enzymes involved in photosynthesis, respiration and nitrogen metabolism.