🌱 12th Bio – Botany Most Repeated 2,3 & 5 Marks Public Exam Questions 2025

📚 Score Full Marks in 2 Mark Questions!
Get the most important 2 mark questions for the 12th Bio – Botany Public Exam 2025, compiled from previous year board exam papers. These short-answer questions help you quickly revise key concepts and secure easy marks in the exam.

🔹 Covers key concepts, diagrams & important terminologies
🔹 Chapter-wise 2-mark questions
🔹 Based on Tamil Nadu Board syllabus & latest exam pattern
🔹 Includes previous year question papers & PDF downloads

NOTE : THIS IS TOP 20 IMPORTANT QUESTIONS BUT FOR 90+ REFER ADDITIONAL 2 & 3 MARKS FROM PURE SCIENCE BOTANY

Biology Botany Two Marks

  1. What is Mellitophily?Ch1 BB38
  2. A detached leaf of Bryophyllum produces new plants. How?Ch1 Pg2
  3. Eichhornia Crassips is called as Terror of Bengal. Why?Ch1 Pg2
  4. Give the names of the scientists who rediscovered Mendelism.Ch2
  5. What is backcross?Ch2
  6. Define Totipotency?Ch5 Pg97 Pg111
  7. Differentiate Linkage and Crossing over.Ch3
  8. What is Cantharophily?Ch1
  9. What is called Phytoremediation?Ch6
  10. Pyramid of energy is always upright. Give reasons.Ch7
  11. Write a type of aquatic ecosystem with one example.Ch7
  12. Construct the food chain with the following data:Ch7
    • Hawk, plants, frog, snake, grasshopper
  13. Expand CCS.
  14. Write any two effects of ozone depletion.
  15. Define emasculation.Ch9
  16. What is Dobson unit?Ch8 pg157
  17. Mention the significance of ploidy.Ch3
  18. Productivity of profundal zone will be low. Why?Ch7
  19. Differentiate secretary and invasive tapetum.Ch1
  20. Name the chemicals used in gene transfer.Ch4
  21. Define the term Diplospory.Ch1
  22. What is an Atavism?Ch2
  23. What is Vulcanization?Ch10
  24. Differentiate primary introduction from secondary introduction?Ch9 pg175
  25. Define food chain? Give an example?Ch7
  26. What are psychoactive drugs?Give one example.Ch10
  27. What is seed ball?Ch6
  28. Mention the different types of culture medium used in plant tissue culluve?Ch5
  29. How are microbial inoculants used to encrease the soil fertility?Ch4 Pg69
  30. ‘Endothecium is associated with dehiscence of anther’. Justify the statement?Ch1

Biology Botany Three Marks

  1. Write the functions of tapetum.ch1
  2. Draw and label the parts of a mature anther.Pg7 Pg8
  3. The endosperm of angiosperm is different from gymnosperm. Do you agree? Justify your answer.Ch1
  4. What is the reason for similarities and differences of appearance and skipping of generations?Ch2 pg31
  5. Name the seven contrasting traits of Mendel.Ch2
  6. Draw the structure of an ovule and label the parts.Ch1
  7. What is genetic mapping? Write its uses.Ch3 pg6
  8. Give an account on Cryopreservation.Ch1
  9. What are the seven characters of Pisum sativum studied by Mendel?Ch2
  10. Expalin PBR322?Pg75 Pg89
  11. Draw a pyramid from the following details and explain in brief:
  12. Quantities of organisms are given. Hawks – 50, plants – 1000, rabbit and mouse – 250+250, pythons and lizard – 100+50 respectively.Ch8
  13. Write the significance of plant succession.Ch7
  14. Write a note on the effects of deforestation.Pg160 Pg183
  15. How do sacred groves help in the conservation of biodiversity?
  16. Give four examples of plants cultivated in commercial agroforestry.Ch8 Pg159
  17. Write down the importance of crossing over.Pg55 Pg57
  18. Compare the various types of blotting techniques.Ch4
  19. List out the importance of Geographic Information System.Ch8
  20. Generally, human activities are against the ecosystem. As a student, how will you help to protect the ecosystem?Ch7
  21. Draw and label the diagram of a monocot seed.Ch1
  22. What is the Albedo effect? Write its effects?Pg114 Pg128
  23. What are the effects of ozone depletion?Ch8
  24. Draw the structure of an embryo sac and label its parts.Ch1
  25. Explain Atavism.Ch2 pg 46
  26. What is thermal stratification? Explain its types?Ch6
  27. Explain about “Queen of spices” & Write their uses.Ch10 Pg191
  28. Which is called as “king of bitters”?Mention their medicinal importance?Pg197 pg235

Biology Botany Five Marks

  1. With a suitable diagram explain the structure of an ovule. Ch1[or]
  2. Bring out the inheritance of chloroplast gene with an example.Ch2
  3. Describe dominant epistasis with an example.Ch2
  4. Explain the basic concepts involved in Plant Tissue Culture.Ch5
  5. Give an account of various types of parasitism with examples. Ch6
  6. Mention the applications of Biotechnology.
  7. How will you prepare an organic pesticide for your home garden with the vegetables available from your kitchen?Ch10
  8. Give detailed account on parthenocarpy.Add a note on its significance?Ln1 Pg27
  9. Explain the mechanism of crossing over?Ln3 Pg56c3
  10. Explain the pollination mechanism in salvia?Pg17 Pg18
  11. What are psychoactive drugs? Add a note on Marijuana and Opium. Ch10
  12. What is Endosperm? Explain the types. Ch1
  13. Explain DNA replication in Eukaryotes?Ln3 Pg68
  14. What is bioremediation?write any three types?Ln4 pg99&100
  15. Rearrange the various stages of succession.Find out the type of succession ?Explain in detail?
  16. Read-swamp stage.phytoplankton stage,shrub stage,submerged plant stage,forest stage,submerged free floating stage,marsh medow stage?Ln7 BB26
  17. What is single cell protein? Mention its applications? Ch4
  18. Give a flowchart – Types of ecosystem services. Ch7
  19. What are the effects of deforestation and benefits of agroforestry?Ch8
error: Content is protected !!
Scroll to Top