Chapter 3 : Reproductive Health

1. List out the major tasks carried out under Family planning programme?Ln3Pg32 Pg32
2. Explain various intrauterine devices?Ln3
3. Explain the various technologies used for detecting foetal disorders during early pregnancy?Ln3 Pg40
4. How are STD transmitted?Explain the bacterial Std?Ln3 Pg36
5. What is Assisted Reproductive Technology? Explain about invitro fertilization?Ln3 Pg39

Chapter 4 : Principles of Inheritance and Variation

1. Give a schematic representation of inheritance of colour blindness by way of marriage between colour blind man and normal visioned women?Ln4
2. Explain the sex linked inheritance in X chromosome,Marriage between normal visioned man and colour Blind women?Ln4
3. What is Huntington’s chorea?Ln4 Pg54
4. Write notes on the Autosomal aneuploidy in human beigns?Ln4Pg53 Pg55
5. What is Eugenics?Explain the methods of Eugenics?Nill Pg56
6. Explain the allosomal abnormalities in human beings?Ln4 Pg55
7. How sex determined in human beigns?Ln4 BB34

Chapter 5 : Molecular Genetics

1. List out the salient features of genetic code?Ln5
2. Explain the Lac operon model with neat diagram?Ln5 Pg82
3. Explain semiconservative method of DNA replication with suitable diagram?Ln5 Pg69
4. What is DNA Fingerprinting?write about its applications?Ln5 Pg84,86
5. Write the properties of Genetic material?Ln5 Pg66
6. Why tRNA is called an adapter molecule?Ln5 Pg77
7. Write in detail about the RNA world?Ln5 Pg66
8. Write the salient features of Human Genome Project?Ln5 Pg83
9. Darwin’s finches and Australian marsupials are suitable examples of adaptive radiation – justify the statement?Ln5 BB25

Chapter 6 : Evolution

1. Taking the example of peppered moth,explain the action of natural selection,what do you call the above phenominon?Ln6
2. Explain stabilizing,directional and disruptive selection with examples?Ln6 Pg103
3. Mention objection to Darwinism?Ln6 pg100
4. What is Extinction?Explain the three types of Extinction?Ln6 Pg108
5. Differentiate between divergent evolution and convergent evolution with example?Ln6 Pg97
6. Explain the experimental approach to the origin of life?Ln6 Pg95
7. Explain in detail the various types of fossilization?Ln6 Pg93 Pg96
8. What do you mean by extinction?Explain the three types of extinction?Ln6
9. Explain Urey – Miller’s experiment with diagram?Ln6 Pg95

Chapter 7 : Human Health and Diseases

1. What are the posibble reasons for lifestyle disorders in human beings?Ln7
2. Explain the effect of the drug and alcohol?Ln7
3. Write in detail the preventive measures of drug and alcohol abuse?Ln7 Pg123
4. Life cycle of plasmodium in human?Ln 7 Pg117
5. Write notes on any two protozoan diseases which commonly occur in human beings?Ln7Pg116
6. Explain diseases caused by virus?Ln7
7. Tabulate any five Human viral diseases?Ln7 Pg115
8. Explain the structure of immunoglobin with a neat labelled diagram?Ln7 Pg124 Pg137

Chapter 8 : Immunology

1. Write the diferences between Primary and secondary immune response?Ln8 Pg132
2. Explain the production of Biogas  or Gobar gas?Ln8 Pg143 Ln9 pg153
3. Tabulate the differences between the Normal cells and cancer cells?Ln8
4. What are vaccines ?Explain their types?Ln8
5. Describe the physiological barrier of innate immunity?Ln8
6. Explain the structure of Hiv with suitable diagram and label the parts?Ln8 pg 141
7. Draw a neat labelled diagram of a lymph node?Ln8 Pg134
8. Write notes on 1)Brewer’s yeast 2)Ideonella sakaiences?Ln8 Pg151,Pg154 BB11
9. Different types of innate immunity and their mechanism?Ln 8 Pg117 Pg130

Chapter 9 : Microbes in Human Welfare

1. Nill

Chapter 10 : Applications of Biotechnology

1. What are the applications of Polymerase chain Reaction(PCR)?Ln10 Pg165
2. Describe the preparation of human insulin from Recombinant DNA Technology?Ln10 Pg158
3. Explain the animal cloning by Bio-Technology?Ln10 Pg167
4. Explain PCR (Polimer chain Reaction) in clinical Diagnosis?Ln10 Pg165
5. What is cloning?Explain the process of cloning of Dolly?Ln10 Pg167
6. List out the possible threats of genetically modified organism?Ln10 Pg170
7. List the uses of transgenesis?Ln10 pg166
8. What are recombinant vaccines and explain its types?Ln10 Pg159
9. How is the amplification of a gene sample of interest carried out using PCR?Ln10 BB12

Chapter 11 : Organisms and Populations

1. Adaptation of aquatic animals?Terrestrial animal?Ln11 Pg187
2. Tabulate the Analysis of two/ three species population interactions?Ln11 Pg191
3. Write the different types of responses observed in animals?Ln11 Pg186

Chapter 12 : Biodiversity and its Conservation

1. Explain the causes of loss of Bio-Diversity?Ln12 Pg207
2. Write the reasons for the richness of bio-diversity in the tropics?Ln12 Pg200
3. Alien species invasion is a threat to endemic species – substantiate this statement?Ln12 BB20
4. Mention the major threats to biodiversity caused by human activities. Explain.Ln12 BB21
5. List out the general strategies for conserving biodiversity?Ln12 pg214

Chapter 13 : Environmental Issues

1. What are the harmful effects of over use of agrochemicals?Ln13 Pg227
2. Write the effects of Air pollution?Ln13 Pg221
3. What are agro chemicals.write about the effects of chemicals used in the field of agriculture?Ln13
4. Explain three stages of wastewater treatment?Ln13

📢 More 12th Zoology Exam Resources:
📘 12th Zoology Two mark questions
📗 12th Zoology Three mark questions
📚 12th Zoology Model Question Papers

🎯 Why Focus on five-Mark Questions in 12th Zoology?
Two-mark questions are a crucial part of the Zoology public exam, covering definitions, diagrams, short explanations, and key terms. Mastering these ensures full marks in this section.

📚 Chapter-wise 5-Mark Questions Covered:
🔹 Human Physiology – Circulatory System, Nervous System, Excretion
🔹 Genetics & Evolution – DNA Structure, Mendelian Inheritance, Evolution Theories
🔹 Biotechnology & Its Applications – Genetic Engineering, Cloning, DNA Fingerprinting
🔹 Ecology & Environment – Biodiversity, Conservation, Ecosystem Functions

📢 External References for Zoology Exam Preparation:
🔗 12th Zoology Textbook – Tnbooks
🔗 12th Zoology One marks short cuts

🚀 Maximize Your Scores! Visit Padidaa.com for the latest 12th Public Exam updates, study materials, and video lectures! 🎯