Yellow vein mosaic is a disease that primarily affects: (MCAER 2015)

✔Explanation: Yellow vein mosaic is a viral disease that commonly affects okra plants, causing yellowing of the veins and stunting of growth.

🔑Key Points:
-Microorganisms are harmful in many ways. Some of the microorganisms cause diseases in human beings, plants and animals.
-Such disease-causing microorganisms are called pathogens.
-Several microorganisms cause diseases in plants like wheat, rice, potato, sugarcane, orange, apple and others. The diseases reduce the yield of crops.
-The disease Yellow vein mosaic of bhindi is caused by a Virus called the Begomovirus. It is transmitted by an insect – Whitefly.
-The disease is characterised by mosaic-like yellowing of veins & veinlets of leaves.