In this work, nanocrystalline The purpose of this mixed method study was to assess examine the objectives of Bloom’s taxonomy its usage and at secondary level while teaching the sciences subject in the Sindh. The population of this study was 508 teachers of science and 50 headmasters. Questionnaire and an interview protocol were used to collect the data through stratified random sampling technique Mean Chi square were interpretation of the data. Used for The qualitative findings highlighted that teacher teaches science subjects and apply exam-oriented strategy without touching the Bloom’s taxonomy .Majority of teacher teaches science subjects in traditional way .They do not apply student-centered and motivational techniques and appropriate assessment mechanism while teaching sciences subject. The result of the study revealed that the total 83% teachers are failing to use first three levels of Bloom’s taxonomy namely knowledge, comprehension and application while teaching sciences subject. The researcher strongly recommended applications of Bloom’s taxonomy and its objectives are necessary for science teachers at secondary level to teach sciences subject effectively in order to develop the students’ concepts rather than make them ableto choose rote method of learning. Moreover researcher also recommended that teachers should develop their interest in sciences subject and apply latest teaching methodology while teaching science. The administration, teaching training institutes, head masters trained their teachers should strictly monitor them that at what extent they successfully use the Bloom’s taxonomy in the classroom learning.