Jahnavi's opinion is "Environmental movement needs mob of people and elaborate machinery". Justify the statement.

Find the correct statement. (A) Environmental movements hinder the development., (B) The main demand of environmentalists is rescue of affected persons.

State whether the following statements are true or false . Justify your answers . (i) Every irrational number is a real number . (ii) Every rational number is a real number . (iii) Every real number need not be a rational number (iv) sqrt(n) is not irrational if n is a perfect square .

State whether the following statements are true or false. Justify your answers. (iii) Every real number need not be a rational number