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: Plant Nutrition →

1. Which set of vegetables is underground stem or modified stem of a plant?Asked in UPSC CDS 1 2024
2. White Bud disease in plant is caused by deficiency ofAsked in JPSC CS Prelims 2016
3. The green colour of a plant leaf is due toAsked in TOURIST INFORMATION OFFICER(TIO) 2017
4. A plant having yellow leaves with dead spots has the deficiency ofAsked in UPSC NDA 2 2016
5. Which of the following is an insectivorous plant?Asked in UPPCS Prelims 2023
6. White tip of maize leaves indicates the deficiency ofAsked in UPPSC Upper Mains 2010
7. Buttoning in cauliflower is caused due to deficiency of which nutrient ?Asked in Agri. Officer 2020
8. ‘Little leaf’ of cotton occurs due to the deficiency of which nutrient ?Asked in Agri. Officer 2020
9. Petal burn in Chrysanthemum is due to deficiency of which nutrient ?Asked in Agri. Officer 2020
10. Deficiency of which of the following elements causes yellowing and poor growth of the plants?Asked in RO ARO pre 2023
11. Which one of the following nutrients is *not* available in fertilizers?Asked in UPSC CISF AC EXE 2020
12. With reference to 'earthworms', which of the following statements is/are correct? 1. Earthworms improves soil fertility and are known as farmer's friends. 2. Earthworm has two pair of hearts. Select the correct answer from the code given below : Code :Asked in uppsc 2025 2025
13. This statement is correct. Earthworms play a crucial role in soil aeration, drainage, and nutrient cycling through their burrowing and waste-excreting activities, thus improving soil fertility. They are often referred to as "farmers' friends" due to their beneficial impact on agriculture. 2. This statement is incorrect. An earthworm has not two pairs, but rather four pairs of seminal vesicles, and it possesses five pairs of aortic arches, which are often colloquially referred to as "hearts". So, it has five "hearts" (aortic arches) rather than two pairs. 12. For the below Assertion and Reason, choose the correct alternative : Assertion (A) : Commonly, there are 20 recognized macro and micro inorganic elements in fish body. Reason (R) : Essential functions of inorganic elements are metabolism, bone formation, blood clotting, muscle function, impulse transmission, energy transformation, permeability of cellular membrane, genetic coding & control of reproduction and growth. - Question not attemptedAsked in Asst. Fisheries Development Officer 2024
14. Assertion (A) : Mahua oil cake is used for manuring as well as an effective agent for eradication of predatory and weed fishes. Reason (R) : Mahua oil cake contains Rotenone (about 4-6%) which is an effective fish poison. Choose the correct answer : - Question not attemptedAsked in Asst. Fisheries Development Officer 2024
15. Plants receive their nutrients mainly fromAsked in BPSC Prelims Exam 67th Re Exam
16. Which chemical fertilizer is essential for better rhizobial nitrogen fixation?Asked in GPSC Prelims CSP 2 2024
17. Plants receive nutrients fromAsked in WBPSC CS Prelims 2020
18. Which of the following clay mineral is dominant in red soil ?Asked in Agri. Officer 2020
19. Parameter that indicates the water's buffering capacity and resistance to pH changes - Question not attemptedAsked in Asst. Fisheries Development Officer 2024
20. A list of some soil textures is given below: A. Clay loam B. Silty clay C. Sandy clay D. Silty clay loam Which of these are suitable for fish ponds?Asked in Asst. Fisheries Development Officer 2024
21. Which is high salt tolerant crop ?Asked in Food Safety Officer 2022
22. What is Hydroponics ?Asked in UPPSC Upper Mains 2009
23. 'Hydroponics' isAsked in Additional Private Secretary Exam 2017
24. The method of growing plants (without the use of soil) usually crops; by using mineral nutrient solutions is known asAsked in Assistant Auditor (Direct) 2021
25. Hydroponics is concerned withAsked in Assistant Conservator of Forest (ACF) 2012