CBSE Class 12 Biology Viva Questions with Answers 2026: Top Biology Practical Viva Solutions PDF Download

Biology Viva Questions Class 12: The Class 12 Biology practical examination plays a crucial role in the board results, and the viva voce (oral exam) often decides the final impression of a student’s preparation. Many students perform experiments well but lose marks during the viva due to lack of clarity, confidence, or conceptual understanding.

This article covers the most frequently asked Biology practical viva questions with clear and simple answers, helping students revise effectively and face the examiner with confidence.

Check:

• CBSE Class 12 Biology Practical Syllabus

• CBSE Class 12 Biology Competency Based Questions

• NCERT Class 12 Biology Lab Manual PDF

• Class 10 and 12 practical exam dates

CBSE Class 12 Biology Top Viva Questions With Answers

The CBSE Class 12 practical exams are approaching, and students should begin revising viva questions. Examiners expect short and to-the-point answers, not long explanations. Focus on providing clear, concise replies during the viva. Avoid explaining the entire concept; instead, stick to what is asked. Preparing in this way will help you feel confident and save time during the exam. Review the important questions shared here for the Class 12 Biology Viva 2026. Practise answering these questions in simple language so that you understand the concepts clearly. Stay calm and focused for your practical exam to perform your best.

50 Short Viva Questions for CBSE Class 12 Biology Practicals

General Practical Knowledge

1. What is the purpose of a quadrat method in plant studies?
   To measure the number of plants in a specific area.
2. Why is pollen germination observed on a temporary slide?
   To study the germination process of pollen.
3. How is mitosis different from meiosis?
   Mitosis produces identical cells, while meiosis produces gametes.
4. What is the function of DNA in a cell?
   DNA stores genetic information.
5. Why do we use iodine in starch tests?
   To test for the presence of starch.
6. Name one piece of equipment used to isolate DNA.
   Blender or mortar and pestle.
7. What is a Bunsen burner used for in practicals?
   For heating and sterilisation.
8. What are the steps involved in making a temporary slide?
   Place the sample on a slide, add a stain, and cover with a coverslip.
9. Why is Biology called a life science?

Biology is called a life science because it deals with the study of living organisms and life processes.

Check | CBSE Class 12 Biology Deleted Syllabus 2026

Pollen Germination and Pollination

1. What is pollination?
   Transfer of pollen from anther to stigma.
2. Name one flower that is pollinated by wind.
   Maize.
3. How do insects help in pollination?
   They transfer pollen while feeding on nectar.
4. What does pollen germination show about a flower's reproductive health?
   It shows pollen viability.
5. Why is controlled pollination done?
   To control which plants cross-pollinate.

Cell Division

1. What is observed in the onion root tip slide?
   Different stages of mitosis.
2. How many stages are there in mitosis?
   Four (Prophase, Metaphase, Anaphase, Telophase).
3. Name one stage of meiosis.
   Prophase I.
4. Why is onion used for studying cell division?
   Its cells divide actively and are easy to observe.

Check | CBSE Class 12 Physics Viva Questions with Answers 2025

Plant Population Studies

1. What is plant population density?
   Number of plants per unit area.
2. How do you calculate population frequency?
   By counting plants in multiple quadrats and averaging.
3. Why is the quadrat method important?
   It gives an estimate of plant distribution.

Genetics and Inheritance

1. Who is known as the father of genetics?
   Gregor Mendel.
2. What is Mendelian inheritance?
   The inheritance of traits through dominant and recessive genes.
3. What is a pedigree chart?
   A diagram showing family traits across generations.
4. Give an example of a dominant trait in humans.
   Rolling of tongue.
5. What is colour blindness?
   Inability to distinguish certain colours.

Animal Studies

1. What is the function of testis in gamete development?
   It produces sperm cells.
2. Name one permanent slide used to study meiosis.
   Onion bud or grasshopper testis.
3. What is a blastula?
   A hollow ball of cells formed during early development.
4. How is a T.S. of a testis different from a T.S. of an ovary?
   Testis produces sperm, ovary produces eggs.
5. What is Ascaris?
   A parasitic roundworm.

IMPORTANT | CBSE Class 12 Most Repeated Questions

Disease-Causing Organisms

1. Name one disease caused by Plasmodium.
   Malaria.
2. What are the symptoms of ringworm?
   Red, itchy circular patches on the skin.
3. What type of organism causes amoebiasis?
   Entamoeba histolytica.
4. Why is it important to study disease-causing organisms?
   To understand diseases and their prevention.

Adaptations and Associations

1. What are xerophytic plants?
   Plants adapted to dry conditions.
2. Name one morphological adaptation of xerophytes.
   Thick leaves to store water.
3. What is a symbolic association?
   A mutual benefit between two organisms.
4. Give an example of a root nodule.
   Leguminous plants and nitrogen-fixing bacteria.
5. What is lichen?
   A symbiotic association of algae and fungi.

Apparatus and Equipment

1. Name two types of soil used in experiments.
   Sandy and loamy soil.
2. What is the use of a petri plate?
   To grow or observe samples.
3. Why is aluminium foil used in practicals?
   To cover and protect samples.
4. How is a water bath helpful in experiments?
   To maintain a constant temperature.
5. Name two models you used during the practicals.
   Morula and blastula models.

Check |

Revised NCERT Textbook For Class 12 Biology

Latest NCERT Solutions For Class 12 Biology

Miscellaneous

1. What is the importance of homologous organs in evolution?
   They show common ancestry.
2. Give one example of an analogous organ.
   Wings of a butterfly and a bird.
3. What is the purpose of studying flowers in pollination experiments?
   To understand different pollination mechanisms.
4. What are the benefits of practising controlled pollination?
   To improve crop yield and quality.
5. Why is practical knowledge important for biology?
   It helps in applying theoretical knowledge.
6. How do models and specimens help in understanding biology?
   They provide a visual and practical understanding.

10 Spotting Questions for CBSE Class 12 Biology Practicals

1. Identify the flower and explain its pollination mechanism.
   (Example: Wind-pollinated or insect-pollinated flowers)
2. Observe the pollen germination on the stigma using a permanent slide.
   Identify the process and its significance.
3. Identify the T.S. of a testis or ovary and describe the stage of gamete development.
   (Examples: T.S. of testis showing seminiferous tubules)
4. Identify the stage of meiosis from the given slide.
   (Example: Metaphase I or Anaphase II)
5. Observe the T.S. of a mammalian blastula. What stage of development is shown?
6. Comment on Mendelian inheritance using seeds of different colours or sizes.
   Identify the dominant and recessive traits.
7. Identify the genetic trait using the given pedigree chart.
   (Examples: Rolling of tongue, blood group inheritance)
8. Identify the disease-causing organism in the slide or model.
   (Examples: Ascaris, Plasmodium, or ringworm fungus)
9. Comment on the symbolic association shown in the model/specimen.
   (Examples: Root nodules in legumes or lichens)
10. Identify and differentiate between homologous and analogous organs shown in the models.
    (Examples: Forelimbs of a human and a bat or wings of a butterfly and a bird)

These questions cover all practical areas and help students prepare effectively for viva. Follow Jagran Josh for related updates  on CBSE exams 2025-26.

Also Check:

• CBSE Additional Practice Questions for CBSE Board Exam
• NCERT Books for CBSE Class 12 - Latest Edition
• NCERT Solutions for CBSE Class 12 - Updated
• NCERT Rationalised Content for Class 12