The Vishvas Biology Lab Activity Book for Class 12th is a meticulously designed practical companion tailored for students following the Class 12 CBSE Biology curriculum. Authored by distinguished educators Dr. Sushma Gupta and Dr. Sanjay Kumar Jha and published by Vishvas Publications Pvt. Ltd., this lab manual bridges the gap between theoretical concepts and hands-on scientific inquiry. It is an indispensable resource for mastering practical biology, ensuring students are thoroughly prepared for their board examinations and internal assessments.
This comprehensive activity book is systematically divided into two sections: Section A (List of Experiments) and Section B (Study/Observation/Spotting). Each experiment and observation follows a standardized format, including aim, apparatus, procedure, observations, precautions, and viva-voce questions, promoting methodical learning.
Section A: Core Experiments
Students will engage in essential hands-on activities that form the backbone of Class 12 practical biology. Key experiments include the following:
- Prepare a temporary mount to observe pollen germination – understanding viability and outgrowth of pollen tubes.
- Study plant population density and frequency by the quadrat method—ecological techniques for field studies.
- Prepare a temporary mount of an onion root tip to study mitosis—visualizing cell division stages under a microscope.
- Isolate DNA from available plant material such as spinach, green pea seeds, etc. – a foundational biotechnology technique demonstration.
Section B: Observation and Spotting
This section sharpens observational skills through permanent slides, models, and specimens. Students will learn to identify and comment on:
- Flowers adapted to pollination by different agencies (wind, insects, birds).
- Stages of gamete development via T.S. testis and T.S. ovary slides (grasshopper/mouse).
- Meiosis in onion bud cells or grasshopper testes through permanent slides.
- T.S. of blastula (mammalian) for embryology understanding.
- Mendelian inheritance using seeds of different colors/sizes.
- Pedigree charts for genetic traits (tongue rolling, blood groups, widow’s peak, color blindness).
- Controlled pollination techniques – emasculation, tagging, and bagging.
- Common disease-causing organisms – Ascaris, Entamoeba, Plasmodium, ringworm fungus – with symptoms.
- Symbiotic associations – root nodules of legumes, Cuscuta on host, lichens.
- Homologous and analogous organs via flash cards/models.
Why Choose This Lab Activity Book?
- 100% Curriculum Alignment: Strictly follows the latest Class 12th syllabus.
- High-Quality Diagrams & Illustrations: Accurate, labeled diagrams assist in easy identification during spotting.
- Exam-Oriented Approach: Includes previous years’ practical exam questions and viva preparation tips.
- Durable & Student-Friendly Paper: Designed for lab use, with clear, jargon-free language.
