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.

Read the notes: Heredity →

1. Chromosome number in any speciesAsked in CGPSC Prelims Exam 2019
2. Chromosomal theory of inheritance was given by:Asked in B. glycogen is made in animal cells, but starch is · UPSC CAPF 2023 · JPSC CS Prelims 2021
3. Who among the following shared the Nobel Prize in 1962 along with Francis Crick and James Watson for their discoveries concerning the molecular structure of nucleic acids ?Asked in UPSC NDA 2 2017
4. Double-helical structure of DNA was given by whom?Asked in UPPCS Prelims 2018
5. In wheat, the Ph gene which suppresses homologous pairing between chromosomes is located onAsked in Agri. Officer 2020
6. Number of chromosomes in Tor Khudree are : - (5) Question not attemptedAsked in Asst. Fisheries Development Officer 2024
7. How many pairs of chromosomes are present in humans ?Asked in Clerk GR II Comb. Comp. Exam 2013
8. In which of the following, 3 different phenotypes are observed?Asked in Agri. Officer 2020
9. Gene for gene hypothesis was given byAsked in Agri. Officer 2020
10. Which of the following should be avoided in biological marriage ?Asked in OPSC CS Prelims 2015
11. Human genome has how many chromosomes?Asked in lower devision clerk 2025
12. The diploid number of chromosomes in human bodyAsked in Forest Officer (RFO) 2018
13. A pure red flower bearing plant is crossed with a pure white flower and the F₁ plant bears pink flowers. This is an example ofAsked in WBPSC CS Prelims 2016
14. Which among the following is an example of incomplete dominance ?Asked in Clerk GR II Comb. Comp. Exam 2013
15. How many linkage groups are present in the female and male grasshopper insect?Asked in MPSC CS Prelims 2019
16. Match List I with List II and select the correct answer using the codes given below the Lists: List II List I (Scient‐ (Achievement in genetics) ists) I. Discovery of tramsdiction and A) Khur‐ Conjugation in bacteria ana II. Establishing the sex-linked in‐ B) Kornheritance berg III. Isolation of DNA polymerase C) Lederform E. coli berg D) Mor‐ IV. Establishing the complete gan genetic code E) OchoaAsked in UPPCS Prelims 2001
17. Which of these decrease the frequency of recombination between two genes?Asked in Agri. Officer 2020
18. Which of the following is responsible for controlling hereditary characters of the living cells ?Asked in BPSC Prelims Exam 60 62rd
19. Who discovered DNA?Asked in BPSC Prelims Exam 64th
20. The DNA double helix structure was discovered byAsked in BPSC Prelims Exam 69th
21. What is the expanded form of the term ‘mRNA’ that has been widely discussed since the beginning of the pandemic?Asked in BPSC Prelims Exam 69th
22. The process of copying genetic information from one strand of DNA into RNA is termed asAsked in UPSC CDS 1 2017
23. Photo 51 refers to an image ofAsked in UPSC CDS 1 2024
24. Match List-I with List-II: List-I List-IIAsked in HPPSC HPAS Prelims 2020
25. Gregor Mendel is often referred to as the Father of Genetics, since he first enunciated the principles of heredity. His experimental material wasAsked in MPSC CS Prelims 2018