AP BIOLOGY

Detailed explanation-1: -Iron and magnesium are the elements that are required for the synthesis of chlorophyll in plants.

Detailed explanation-2: -Plants use magnesium ions to make chlorophyll in their leaves. Like in nitrate deficiency, the plant is limited in terms of its photosynthetic ability and the plant growth is compromised. Magnesium is a limiting factor in healthy plant growth.

Detailed explanation-3: -Chlorophyll consists of a porphyrin ring-a molecule made of carbon, nitrogen and hydrogen-attached to a long hydrocarbon tail. At the center of the porphyrin ring, a magnesium ion stabilizes the chlorophyll molecule and transfers electrons down an electron transport chain to drive the photosynthetic process.

Detailed explanation-4: -Mg2+ is essential for the function of many cellular enzymes and for the aggregation of ribosomes. Mg2+ concentrations also modulate ionic currents across the chloroplast and the vacuolar membranes, and might thus regulate ion balance in the cell and stomatal opening.