Phosphorus is a constituent of nucleic acids of both DNA and RNA but absent in cell membranes and cell proteins.

Correct Option: C

Phosphorus is a constituent of nucleic acids of both DNA and RNA but absent in cell membranes and cell proteins.

In the global nitrogen cycle, bacterial denitrification is recognised as important process that converts fixed nitrogen to atmospheric nitrogen gas, N₂. In marine nitrogen cycle, anaerobic oxidation of ammonium coupled to nitrate reduction, contributes substantially to N₂–production in marine sediments.

Correct Option: A

In the global nitrogen cycle, bacterial denitrification is recognised as important process that converts fixed nitrogen to atmospheric nitrogen gas, N₂. In marine nitrogen cycle, anaerobic oxidation of ammonium coupled to nitrate reduction, contributes substantially to N₂–production in marine sediments.

Ammonia is the first stable compound produced in fixation of atmospheric nitrogen in leguminous plant. A molecule of nitrogen is changed into two molecules of ammonia. It requires 16 ATP, a source of electron donor ferredoxin, hydrogen donor NADPH or FMNH₂ and dinitrogenase enzyme.

Correct Option: A

Ammonia is the first stable compound produced in fixation of atmospheric nitrogen in leguminous plant. A molecule of nitrogen is changed into two molecules of ammonia. It requires 16 ATP, a source of electron donor ferredoxin, hydrogen donor NADPH or FMNH₂ and dinitrogenase enzyme.

In lichens, the association between an algae and a fungus is considered to be a symbiotic one. In this association, algae provides food to fungi.

Correct Option: A

In lichens, the association between an algae and a fungus is considered to be a symbiotic one. In this association, algae provides food to fungi.

Symbiotic relationship between roots of higher plants and fungi is called mycorrhiza, e.g. Pinus roots are associated with fungal hyphae.

Correct Option: B

Symbiotic relationship between roots of higher plants and fungi is called mycorrhiza, e.g. Pinus roots are associated with fungal hyphae.