CBSE Class 12 Biology Practical Syllabus 2024-25: Download Marking Scheme Here!

IMPORTANT> CBSE CLASS 12 BIOLOGY VIVA & SPOTTING QUESTIONS WITH ANSWER PDF

A. List of Experiments 

1. Prepare a temporary mount to observe pollen germination. 

2. Study the plant population density by quadrat method. 

3. Study the plant population frequency by quadrat method. 

4. Prepare a temporary mount of onion root tip to study mitosis. 

5. Isolate DNA from available plant material such as spinach, green pea seeds, papaya, etc. 

B. Study and observe the following (Spotting): 

1. Flowers adapted to pollination by different agencies (wind, insects, birds). 

2. Pollen germination on stigma through a permanent slide or scanning electron micrograph. 

3. Identification of stages of gamete development, i.e., T.S. of testis and T.S. of ovary through permanent slides (from grasshopper/mice). 

4. Meiosis in onion bud cell or grasshopper testis through permanent slides. 

5. T.S. of blastula through permanent slides (Mammalian). 

6. Mendelian inheritance using seeds of different colour/sizes of any plant. 

7. Prepared pedigree charts of any one of the genetic traits such as rolling of tongue, blood groups, ear lobes, widow's peak and colour blindness. 

8. Controlled pollination - emasculation, tagging and bagging. 

9. Common disease causing organisms like Ascaris, Entamoeba, Plasmodium, any fungus causing ringworm through permanent slides, models or virtual images or specimens. Comment on symptoms of diseases that they cause. 

10. Models specimen showing symbolic association in root modules of leguminous plants, Cuscuta on host, lichens. 

11. Flash cards models showing examples of homologous and analogous organs.

A. Items for Identification/ familiarity with the apparatus for assessment in practicals (All experiments) 

Beaker, flask, petriplates, soil from different sites - sandy, clayey, loamy,small potted plants, aluminium foil, paint brush, test tubes, starch solution, iodine, ice cubes,Bunsen burner/spirit lamp/water bath, large flowers, Maize inflorescence, model of developmental stages highlighting morula and blastula of frog, beads/seeds of different shapes/size/texture Ascaris, Cactus/Opuntia (model). 

B. List of Practicals 

1. Study of flowers adapted to pollination by different agencies (wind, insects). 

2. Identification of T.S of morula or blastula of frog (Model). 

3. Study of Mendelian inheritance pattern using beads/seeds of different sizes/texture. 

4. Preparation of pedigree charts of genetic traits such as rolling of tongue, colour blindness. 

5. Study of emasculation, tagging and bagging by trying out an exercise on controlled pollination. 

6. Identify common disease causing organisms like Ascaris (model) and learn some common symptoms of the disease that they cause. 

7. Comment upon the morphological adaptations of plants found in xerophytic conditions. Note: The above practicals may be carried out in an experiential manner rather than recording observations

Download CBSE Class 12 Biology Practical Syllabus 2024-25 PDF

Evaluation Scheme 

Marks

One Major Experiment 5

5

One Minor Experiment 2 & 3

4

Slide Preparation 1 & 4

5

Spotting

7

Practical Record + Viva Voce

(Credit to the student’s work over the academic session may be given.)

4

Investigatory Project and its Project Record + Viva Voce

5

Total 

30