Do u agree or disagree that a knowledge of biology is essential in the battle against disease?explain ans.?

Well do you?

I do. Biology is the primary field behind the study of microbes and their effect on human physiology. The more information you have regarding how these things affect the human body the better you stand against fighting them.

Disease is a biological phenomenon. Disease agents themselves may not be living (e.g. carcinogen) but they affect a body that is biological. Knowing how the body's systems work allows you to understand how a disease might spread in the body, and how one organism might spread a disease to others. Knowing how a cell works must be the beginning of understanding how a disease can affect a single cell in the body. Knowing how cells are organized into tissues and organs, and how they work together in those organs can help you understand how a disease might spread in and affect an organ or a whole body system.

Once you understand those things about how a disease affects the body, you can begin to figure out how to fight the disease. Biological disease agents are easier, because they are also alive, or in the case of viruses, at least have certain requirements of the cellular environment to function. If you know how -their- biology works, you can find something that will disrupt it, but you have to know how the host body works in order to also be sure the cure won't kill the sick organism in the process. Non-biological disease agents are trickier, but they can still be figured out. Cancer, for example, affects how cells reproduce themselves. First you have to know how a cell reproduces and what limits a normal cell has in this process. Then you can see what cancer does to a cell that makes it behave differently. In 'theory' you can then work on something like restoring the normal processes of the cells so they again work with, or at least not against, the host organism's body again, and remove the majority of the now inactive abnormal cells without worrying about the ones left behind spreading the cancer (though that has yet to happen in practice, it is being worked on).

You cannot define disease without a knowledge of biology. A disease is a pathology (a biological science) that triggers departure from physiology (another biological science). Yo might be able to treat some things by trial and error, but would probably do more harm than good.

U Agree

Agree. You need the information of how the body works, how a disease is attained, how bacteria and viruses work and much more.