CBSE Class 9 Science — Chapter Summary

Science at the secondary stage becomes a deeper search for meaning, not just a collection of facts. It depends on careful observation, measurement, models, symbols, equations, testing, and revision. Scientific thinking also uses estimation and reasoning, because exact calculation is not always the f

Cells are the basic structural and functional units of life. Some organisms are made of one cell, while others are made of many cells working together in tissues, organs, and organ systems. Cell study became possible with microscopes because many cells are smaller than the limit of resolution of the

Tissues are groups of similar cells that work together to perform a specific function. In multicellular organisms, tissues create division of labour, which makes the body more efficient. Plant tissues and animal tissues differ because plants need support, growth in specific regions, and transport of