Concept:Iron is essential in plants mainly because it supports the production of chlorophyll and certain vital proteins.
Explanation:Plants require iron to synthesise chlorophyll, the green pigment responsible for capturing light during photosynthesis.
Although iron is not actually part of the chlorophyll molecule, chlorophyll cannot be formed when iron is unavailable.
Iron also forms part of essential proteins and enzymes, including the cytochromes of the electron transport chain.
These iron-containing proteins are important for energy production and other metabolic activities in the plant cell.
When iron is deficient, young leaves show yellowing known as chlorosis, which proves its role in chlorophyll formation.
Iron does not directly promote cell division, protect plants from pest attack, or speed up fruit ripening.
Therefore, the correct statement is the one that links iron to the formation of chlorophyll and proteins.
Answer:A. aids in the formation of chlorophyll and proteins