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
Cells are basic structural and functional units of organisms. The plasma membrane controls exchange with the surroundings. The nucleus contains genetic material; mitochondria release usable energy by respiration. Plant cells usually have a cellulose cell wall, plastids and a large vacuole. Tissues are groups of cells with a shared function.
Curriculum navigation
Cell
Tissues
Motion
Exploring Mixtures and their Separation
Force and Laws of Motion
Work, Energy and Simple Machines
Structure of an Atom
Atoms and Molecules
Sound
Reproduction
Diversity
Earth as a System: Energy, Matter & Life
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 structure controls movement into and out of a cell?
Plasma membrane
Cell wall only
Nucleolus
Chromosome
Worked answer
Plasma membrane
The selectively permeable plasma membrane regulates exchange. The cell wall mainly provides support.
Full publisher materials and answer resources
CBSE 9 Science · 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 · Exploration · 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 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 9, subject and medium. This is a searchable portal, not a promise of a specific playable lesson.