Iron uptake is called active because

Which of the following minerals activate the enzymes involved in respiration?

Brown heart disease is due to deficiency of

Main function of leghemoglobin is to

Most plants obtain their nitrogen from the soil in the form of

In an experiment a plant was dried, crushed and heated strongly in a crucible for long. The residue contained

One of the following is a nitrogen fixing enzyme

Deficiency of mineral nutrients is not responsible for

In which of the following is nitrogen not a constituent?

Carrier proteins are involved in