12th Botany 3-Marks Important Questions 2025 – Public Exam Guide

🌱 12th Botany Important 3-Marks Public Exam Questions 2025

📚 Score Full Marks in 3-Mark Questions!
Get the most important three mark questions for the 12th 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.

🔹 Chapter-wise three mark questions with answers
🔹 Based on Tamil Nadu & CBSE Board syllabus
🔹 High-weightage topics selected from past exams
🔹 Covers Plant Physiology, Genetics, Biotechnology, Ecology & more

Chapter 1 :

  1. Differentiate grafting and layering? BB27 BB31
  2. What is polyembryony.How it can commercially explorted?Pg24 pg 27
  3. Draw and label the structure of embryo sac?Pg12 Pg12
  4. Write short not on pollen kitt?BB41 BB51
  5. list out the functions of Tapetum?Pg8 pg8
  6. Draw the diagram of ovule and label the parts?Pg10 pg10
  7. write short note on heterostyly?Pg14 Pg15
  8. Draw the diagram of mature anther and label the parts?Pg7 Pg8
  9. Write the uses of bee polen?Pg9 Pg9
  10. Distinguish Mound Layering & Air Layering?Pg5 Pg5

Chapter 2 :

  1. What are the reasons for Mendel’s success in his breeding experiment?BB29 BB29
  2. Differentiate incomplete dominance and co-dominance?BB31 Q31
  3. Differentiate continuous variation with Discontinuous variation?BB35 BB34
  4. What is atavism?give example?Pg46 Pg48
  5. Explain the three kinds of plants that have recessive lethal gene in antirrhinum sp?Pg42 Pg44
  6. Complete the following punnett square?Concept question Pg36 Pg38
  7. Name seven contrasting traits of mendel?BB23 BB23
  8. Write a note on reciprocal cross?Pg36 Pg37
  9. What is lethal gene? Give example?Pg41 Pg44

Chapter 3 :

  1. Write the importance of crossing over?Pg55 Pg57
  2. Draw the diagram of different types of aneuploidy?Pg61 pg64
  3. Explain the DNA replication of Taylor Experiment?Nill pg69
  4. Write the salient features of sutton and Boveri concept?Pg51 pg53
  5. Differentiate linkage and crossing over?Pg54 Pg56
  6. Explain about inversion and translocation in structural chromosomal aberration?Pg64 Pg67
  7. What is gene mapping?Pg56 Pg58
  8. What is replication fork?Nill Pg68

Chapter 4 :

  1. What is plant genome?Pg81 Pg95
  2. Expalin PBR322?Pg75 Pg89
  3. Write the advantages and disadvantages of BT.Cotton?Pg83 Pg97
  4. What are the features which reqires to facilitate cloning in a vector?Pg75 Pg88
  5. What is Biopiracy?Give example? Pg87 Pg101
  6. What are the microorganism used for the production of single cell protein?Pg71 Pg85

Chapter 5 :

  1. Give an account on cryopreservation?Pg103 Pg117
  2. Write the protocol for artificial seed preparation?BB20 BB20
  3. Write the applications of somatic embryogenesis?Pg102 Pg116

Chapter 6 :

  1. What is albedo effect?what are its effects?Pg114 Pg128
  2. What is thermal stratification?Mention their types?Pg112 Pg126
  3. Sandy soil is not suitable for cultivation.Explain why?BB32 BB32
  4. What is ecological hierarchy?write the levels of Ecological hierarchy?Pg110 Pg124

Chapter 7 :

  1. Name of the food chain which is generally present in all types of eco system.write its significance?BB20 BB21
  2. The shape of pyramid in a particular eco system is always different.explain with example?BB21 BB22
  3. Write the significance of food web?Pg139 Pg154
  4. Generally the pyramid of number in forest ecosystem look spindle shape.state your reason?Pg139 Pg155

Chapter 8 :

  1. Which gas is most abundant among the green house gas?Discuss the effect of this gas on the growth of plants?Pg157 Pg180
  2. Distinguish between endangered,vulnerable and rare species?Nill BB23
  3. What is plant indicators?Give example?Pg158 pg181
  4. Write the effects of deforestation?Pg160 Pg183
  5. Bring out specific uses of remote sensing?Pg168 Pg195
  6. Draw a pyramid from following details and explain in brief. Quantities of organisms are given-Hawks-50, plants-1000.rabbit and mouse-250 +250, pythons and lizard- 100 + 50 respectively BB24 BB25
  7. What are strategies to deal with global warming?Pg157 Pg180

Chapter 9 :

  1. Define rhizobium?Pg173 Pg201
  2. What are the objectives of plant breeding?Pg175 pg203
  3. Mention the three main types of artificial selection method and explain one of the method?Pg176 Pg204

Chapter 10 :

  1. Which is called as “king of bitters”? Mention their medicinal importance?Pg197 pg235

🎯 Master 3-Marks Questions in 12th Botany Public Exam 2025!
Practicing three mark questions is essential to boost your score in the public exam. These short-answer questions cover definitions, key terms, and important diagrams, ensuring you gain full marks easily.

🔍 More 12th Public Exam Study Resources:
📘 12th Computer Science Important questions 2025
📗 12th Tamil Study Plan 2025
📚 12th Std English Public Exam study Plan

📚 12Th Std Physics Important questions public exam 2025

📢 External References for Zoology Exam Preparation:
🔗 12th English one marks and grammar video tutorial
🔗 12th Botany onemarks shortcuts

🔗 12th Zoology onemarks shortcuts

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