1st PUC Biology Series-13 December 2, 2020December 25, 2020wefru Physics 1st PUC Biology Series-13 Multiple Choice Question Answers for all competitive exams Preparation for NEET / JEE Advance , JEE, JEE main and KSET Preparation. 0 Created on December 02, 2020 By wefru 1st PUC Biology Series 13 TEST YOUR KNOWLEDGE OF SCIENCE 1 / 10 16. The primary treatment of waste water involves the removal of: A. Dissolved impurities B. Stable paricles C. Toxic substances D. Harmful bacteria 2 / 10 4 The free---living fungus Trichoderma can be used for A. Killing insects B. Biological control of plant disease C. Controlling butterfly caterpillars D. Producing antibiotics 3 / 10 21. What would happen if oxygen availability to activated sludge flocs is reduced? A. It will slow down the degradation of organic matter B. The center of flocs will become anoxic, which would cause death of bacteria and eventually breakage of flocs C. Flocs would increase in size as anaerobic bacteria would grow around flocs D. Protozoa would grow in large numbers 4 / 10 25. The residue left after methane production from cattle dung is : A. Burnt B. Buried in land fills C. Used as manure D. Used in civil construction 5 / 10 24. Big holes in Swiss cheese are made by a: A. A machine B. A bacterium that produces methane gas C. A bacterium producing a large amount of carbon dioxide D. A fungus that releases a lot gases during its metabolic activities. 6 / 10 25. The residue left after methane production from cattle dung is : A. Burnt B. Buried in land fills C. Used as manure 7 / 10 9. The term 'Health' is defined in many ways. The most accurate definition of health would be: A. Health is state of body and mind in a balanced condition. B. Health is reflection of a smiling face C. Health is state of physical, mental and social well--being D. Health is the symbol of economic prosperity 8 / 10 10. The organisms which cause diseases in plants and animals us called: A. Pathogens B. Vectors C. Insects D. Worms 9 / 10 11. The chemical test that is used for diagnosis of typhoid is: A. ELISA-----Test B. ESR-----Test C. PCR----Test D. Widal-------Test 10 / 10 12. Diseases are broadly grouped into infectious and non----infectious diseases.I. Cancerii. Influenzaiii. Allergyiv. Small pox A. I and ii B. ii and iii C. iii and Iv D. ii and iv Your score isThe average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz