Original revision introduction and starter practice. Full learning texts are available through the publisher links below. This guide is not a CBSE-issued solution manual.
Revision introduction
Biological classification groups organisms using shared characteristics and evolutionary relationships. Scientific names use genus and species; the genus begins with a capital and the species with a lower-case letter. Distinguish prokaryotic from eukaryotic organisation by the presence of a membrane-bound nucleus, not simply size.
Curriculum navigation
The Living World
Biological Classification
Plant Kingdom
Animal Kingdom
Morphology of Flowering Plants
Anatomy of Flowering Plants
Structural Organisation in Animals
Cell – The Unit of Life
Biomolecules
Cell Cycle and Cell Division
Photosynthesis in Higher Plants
Respiration in Plants
Plant Growth and Development
Breathing and Exchange of Gases
Body Fluids and Circulation
Excretory Products and their Elimination
Locomotion and Movement
Neural Control and Coordination
Chemical Coordination and Integration
Consult the current official syllabus for examinable sections, project-only content, practicals, prescribed texts and exclusions. A unit index does not override those boundaries.
Original practice
Which feature distinguishes eukaryotic cells from prokaryotic cells?
A membrane-bound nucleus
A plasma membrane
DNA
Ribosomes
Worked answer
A membrane-bound nucleus
Eukaryotes have a membrane-bound nucleus; both groups have membrane, DNA and ribosomes.
Full publisher materials and answer resources
CBSE 11 Biology · syllabus · CBSE · 2026-27 The current official syllabus defines examinable content, internal assessment, practicals and prescribed books. Unit names in the app are a navigation index; consult this document for exclusions and assessment boundaries.
NCERT · Biology · NCERT · 2026-27 Official book selector with chapter PDFs and complete-book download. A textbook may contain material outside the assessed syllabus; follow the linked current syllabus.
NCERT Exemplar Problems and Answers · NCERT · Archive · map to 2026-27 Select Class 11 and the subject. The official portal includes answer sections. Older exemplars require checking each question against the current syllabus.
KVS student support material · Class 11 · Kendriya Vidyalaya Sangathan · 2026-27 Use the 2026–27 support-material folders linked by the school. These are KVS teaching/revision resources, not CBSE official marking schemes. Subject availability varies; older packs must be mapped to the current syllabus.
NCERT laboratory manuals · NCERT · Reference · map to 2026-27 Select the class and subject. Use the practical list in the current CBSE syllabus; experiments require teacher supervision.
DIKSHA · curriculum learning resources · Ministry of Education / DIKSHA · Current portal Choose CBSE/NCERT, Class 11, subject and medium. This is a searchable portal, not a promise of a specific playable lesson.