CBSE Biology Practical For Class 12
Time allowed: 3 Hours Max. Marks: 30
|One Major Experiment 5, 6||5|
|One Minor Experiment 2, 3||4|
|Slide Preparation 1, 4||5|
|Practical Record + Viva Voce||Credit to the students’ work over the academic session may be given||4|
|Investigatory Project and its
Project and its Record + Viva Voce
- List of Experiments
- Prepare a temporary mount to observe pollen
- Collect and study soil from at least two different sites and study them for texture, moisture content, pH and water holding capacity. Correlate with the kinds of plants found in
- Collect water from two different water bodies around you and study them for pH, clarity and presence of any living
- Prepare a temporary mount of onion root tip to study
- Study the effect of different temperatures or three different pH on the activity of salivary amylase on
- Isolate DNA from available plant material such as spinach, green pea seeds, papaya,
B. Study/observation of the following (Spotting)
- Flowers adapted to pollination by different agencies (wind, insects, birds).
- Identification of stages of gamete development, i.e., T.S. of testis and T.S. of ovary through permanent slides (from grasshopper/mice).
- Meiosis in onion bud cell or grasshopper testis through permanent
- S. of blastula through permanent slides (Mammalian).
- Prepared pedigree charts of any one of the genetic traits such as rolling of tongue, blood groups, ear lobes, widow’s peak and colour
- Common disease causing organisms like Ascaris, Entamoeba, Plasmodium, any fungus causing ringworm through permanent slides, models or virtual images. Comment on symptoms of diseases that they
- Two plants and two animals (models/virtual images) found in xeric conditions. Comment
upon their morphological adaptations.
- Two plants and two animals (models/virtual images) found in aquatic conditions. Comment upon their morphological
Practical Examination for Visually Impaired Students of Classes XI and XII
Time Allowed: Two hours Max. Marks: 30
|Identification/Familiarity with the apparatus||5|
|Written test (Based on given / prescribed practicals)||10|
- The practical examination will be of two hour duration. A separate list of ten experiments is included
- The written examination in practicals for these students will be conducted at the time of practical examination of all other
- The written test will be of 30 minutes
- The question paper given to the students should be legibly typed. It should contain a total of 15 practical skill based very short answer type questions. A student would be required to answer any 10
- A writer may be allowed to such students as per CBSE examination
- All questions included in the question paper should be related to the listed practicals. Every question should require about two minutes to be
- These students are also required to maintain a practical file. A student is expected to record at least five of the listed experiments as per the specific instructions for each subject. These practicals should be duly checked and signed by the internal
- The format of writing any experiment in the practical file should include aim, apparatus required, simple theory, procedure, related practical skills, precautions
- Questions may be generated jointly by the external/internal examiners and used for assessment.
- The viva questions may include questions based on basic theory / principle / concept, apparatus / materials / chemicals required, procedure, precautions, sources of error
- Items for Identification/ familiarity with the apparatus for assessment in practicals (All experiments)
- Soil from different sites- sandy, clayey, loamy; Small potted plants, Cactus/Opuntia (model), Large flowers, Maize
- Model of Ascaris and developmental stages of frog highlighting morula and blastula.
- Beaker, flask, petri plates, test tubes, aluminium foil, paint brush, bunsen burner/spirit lamp/water bath.
- Starch solution, iodine, ice
A. List of Practicals
- Study of the soil obtained from at least two different sites for their
- Study of flowers adapted to pollination by different agencies (wind, insects).
- Identification of T.S of morula or blastula of frog (model).
- Preparation of pedigree charts of genetic traits such as rolling of tongue, colour
- Identify common disease causing organisms like Ascaris (Model) and learn some common symptoms of the disease that they
- Comment upon the morphological adaptations of plants found in xerophytic
Note: The above practicals may be carried out in an experiential manner rather than recording observations.
- Biology, Class-XII, Published by NCERT
- Other related books and manuals brought out by NCERT (including multimedia)
- Biology Supplementary Material (Revised). Available on CBSE