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: Main Plant Diseases →

1. Viroids are identified on the basis of which of the following three characteristic features? (a) Much smaller in size than viruses (b) Consist of circular RNA molecule (c) RNA molecule covered by protein coat (d) Infect the plant cellsAsked in MPSC CS Prelims 2022
2. Green ear disease of bajra caused by pathogenAsked in Agri. Officer 2020
3. Green ear disease of bajra is caused byAsked in Food Safety Officer 2022
4. The flowers do not open and give rosette appearance in cotton is due toAsked in Agri. Officer 2020
5. In maize due to damage of _______ central shoot withers and leading to “dead hearts”.Asked in Agri. Officer 2020
6. Mustard saw fly belongs to orderAsked in Agri. Officer 2020
7. Lac insect belongs to familyAsked in Agri. Officer 2020
8. Hemi root parasite weed of cowpea isAsked in Agri. Officer 2020
9. Consider the following statements: Assertion (A) : Cuscuta is a parasitic animal. Reason (R) : Cuscuta depends on the host plant for its organic food, water and mineral salts.Asked in TNPSC CS Prelims 2014
10. Which invasive aquatic plant is referred to as the "Terror of Bengal"?Asked in lower devision clerk 2025
11. Which one of the following is NOT correctly matched ? Crop Weed (a) Wheat Phalaris minor (b) Paddy Bathua (c) Pea Piyazi (d) Berseem KasniAsked in RO ARO 2020
12. Parasitic weed associated with mustard isAsked in Food Safety Officer 2022
13. Consider the following : 1. Birds 2. Dust blowing 3. Rain 4. Wind blowing Which of the above spread plant diseases ?Asked in UPSC IAS 2018
14. The quantity of malathion 50 EC required for mixing 250 litre of water to obtain 0.05% spray solution for one acre of paddy to control leaf webber is :Asked in Agri. Officer 2020
15. Example of granular insecticide isAsked in Agri. Officer 2020
16. Insect which can survive at high temperature and low humidity is –Asked in Agri. Officer 2020
17. Match List-I with List-II and select the correct answer from the code given below the lists. List- List- (Plant disease) (Factor) I II A Citrus Cankers 1 Insect Red rot disease Deficiency of B 2 sugar cane oxygen Krishnakant dis‐ C 3 Bacteria ease of potato Sahu disease of D 4 Fungus wheat Code: A) 4 1 3 2 B) 1 3 4 2 C) 3 4 2 1 D) 1 2 3 4Asked in UPPCS Prelims 2022
18. Rice blast disease is a ____ disease.Asked in CGPSC Prelims Exam 2024
19. The deadly disease of groundnut isAsked in JPSC CS Prelims 2021
20. 'Tikka' disease affects which one of the following crops ?Asked in MPSC CS Prelims 2019
21. What is Ug99 ?Asked in PPSC CS Prelims 2013
22. Dieback disease in neem tree is caused by A) Iron deficiency B) Virus C) Fungi D) AlgaeAsked in TSPSC Group 1 Prelims 2023
23. Match List-I with the List-II and select the correct answer from the codes given below: List - I List- II (Name of the Crop) (Name of Disease) A.Sugarcane 1. Late Blight B.Paddy 2. Red Rot C.Arhar 3. Khaira D.Potato 4. Wilt Codes: A B C DAsked in UPPSC Upper Mains 2014
24. Which one of the following is not correctly matchedAsked in UPPSC Upper Mains 2009
25. White rust is an important fungal disease of:Asked in RPSC RAS Prelims 1998