Biology questions with answers

2,759 multiple-choice questions. Open any question for its answer and explanation.

Questions asked in State PSC and UPSC prelims, by topic. Each topic also has notes to read.

26. An increase in concentration of the toxicants which are neither metabolized nor excreted and get deposited at successive trophic levels is calledAsked in Food Safety Officer 2019
27. What is the full form of ‘BOD’?Asked in District Library and Information Officer(DLIO) 2018
28. What is the full form of 'BOD'?Asked in ECONOMIC INVESTIGATOR(EO) 2019
29. Consider the following statements and select the correct answer from the codes given below : (i) The word biophilia originates from the Latin word. (ii) Biophilia means an urge to affiliate with other forms of life. (iii) Biophilia means an unreasonable fear of animals. (iv) Biophilia is the name of a recently discovered bacteria. Codes : A) (i) only B) (ii) C) (iii) D) (i) and (iv)Asked in EI GS T&TR Transport Deptt 2702 2025
30. Which harmful rays are absorbed by Ozone layer ?Asked in Executive Officer and Tax & Revenue Inspector Exam 2023
31. Which of the following is not bio-degradable? - [a] Woollen Mat - [c] Leather Bag - [b] Silver foil - [d] Jute basketAsked in Research Assistant 2014
32. Palaeontology is the study of:Asked in HAS Prelims 2019
33. Fact 1 : All chickens are birds. Fact 2 : Some chickens are hens. Fact 3 : Female birds lay eggs. If the first three statements are facts, which of the following statement/(s) must also be a fact ? I. All birds lay eggs. II. Hens are birds. III. Some chickens are not hens. Choose the correct answer from the options given below :Asked in KPSC KAS Prelims 2017
34. The study of ageing is known asAsked in UPPSC Upper Mains 2014
35. Which is the result of damage to relative biological effectiveness?Asked in WBCS Main Paper 4 2022
36. "Effective dose-50%" describes which one of the following?Asked in WBCS Main Paper 4 2022
37. Who established first Laboratory of Psychology in Leipzig University, Germany ?Asked in Sr. Teacher Gr II (Sanskrit Edu.) Exam 2018 1 2018
38. Who stated that "Educational Psychology is that branch of Psychology which deals with Teaching and Learning" ?Asked in Sr. Teacher Gr II (Sanskrit Edu.) Exam 2018 1 2018
39. Out of the following which Psycholo gist is not related with 'functionalism' ?Asked in Sr. Teacher Gr II (Sanskrit Edu.) Exam 2018 1 2018
40. In which stage of Development "Narcissism" characteristics is more powerful ?Asked in Sr. Teacher Gr II (Sanskrit Edu.) Exam 2018 1 2018
41. Variation between plant height and seed weight can be compared usingAsked in Agri. Officer 2020
42. Making of Curd from Milk is because of:Asked in RPSC RAS Prelims 2010
43. Bacteria that feed upon decaying organic matter in the soil would best be described as which one of the following?Asked in WBCS Main Paper 4 2022
44. The most common indicator organism that represents polluted water isAsked in WBCS Main Paper 4 2022
45. The following organism helps in denitrification:Asked in WBCS Main Paper 4 2023
46. What is the limiting value of water activity for the growth of any microorganism ?Asked in Food Safety Officer 2019
47. Who discovered the process of fermentation ?Asked in ASO 2025
48. Sound wave in air isAsked in BPSC Prelims Exam 65th
49. Which of the following statements about living and non-living being is/are correct? 1. While living being can demonstrate growth and repair, non-living being cannot. 2. While living being demonstrates metabolic processes, non-living being does not. Select the correct answer using the code given below.Asked in UPSC NDA 1 2022
50. The study of Functions, Characteristics and phenomena observed in the living world and the application of this knowledge to the world of Machines is known as:Asked in RPSC RAS Prelims 1995