The degree course B.El.Ed. (Bachelor of Elementary Education) is a four year undergraduate programme in elementary teacher education. It is offered in nine constituents' colleges of University of Delhi. The programme is one of its kind in India and is listed as one of the innovative programmes in Position Paper 2.4, National Focus Group on Teacher Education for Curriculum Renewal, NCERT, 2005. The course structure of B.El.Ed. Has two compulsory and one optional paper on pedagogy of science. The compulsory courses are titled 'Core Natural Science' and 'Pedagogy of Environment Studies'. The syllabi of 'Core Natural Science' just mentions 'Classification, Property, Concept, Relation, and Law’. Is it sufficient for pre service teachers to understand what nature of science is? How is scientific knowledge created? Is science objective or subjective? How do scientists work? Is there something called 'A Scientific Method'? We asked B.El.Ed. Students to explain in their own words 'What is Science?' An analysis of their definitions shows that they do not understand science and its nature. They have no recognition of the tentative nature of some scientific knowledge and hold outdated positivist or empiricist views of the NOS. In such a scenario how can they translate it to students? What should be done in pre service programmes, so that teachers develop the conception of nature of science? This paper attempts to answer such questions.