<prompt> Oedema is caused by fall in plasma proteins below0.5051550  <response>: Ans. is d i.e., 50 o Normal plasma protein is 6-8 gmd1. o Edema occurs when plasma protein falls below 5gmd1. fall in percentage is 58 x 100:.-: 63. So, edema occurs when plasma proteins falls below 63 of normal. 