State any two conditions essential for being free of disease.

State any two conditions essential for good health.

List any two conditions necessary for fixation of nitrogen by Rhizobium.

State the conditions resulting in reverse osmosis?

Name any two places where it is essential to instal electrostatic precipitators. Why it is required to do so?

State two conditions for two light sources to be coherent. Derive an expression for the fringe width in Young.s double slit experiment for interfernce with suitable diagram.

State the conditions under which a force does no work.

Name the tissue that lines the fallopian tubes. State any one advantage of this tissue being present here.