While solving the textbook questions, often students find doubts and pile those up. The come in handy ncert solution class 9th such times as they include precise explanations and detailed answers to those questions. It serves an important studying tool for students preparing for their board examinations and assignments. Chapter two is Is matter around us pure which includes the topics — Matter, Pure matter, Properties of compounds, Properties of mixture, Physical and chemical changes, Tyndall effect, Solutions, suspensions and colloids, Separation of mixtures, Classification of matter, Properties of metals and nonmetals. Chapter three covers Atoms and molecules which includes the topics — Symbols of atoms of different elements, Properties of atoms, Atomic mass, Molecules, Atomicity, Molecular mass, Ions, Classification of ions, Valency, Writing chemical formulae of compounds, Mole, Molar mass, Percentage of an element in a compound, Laws of chemical combination. Below is the example of a revision test of science chapters. Answer in one line- Which is the cell that exists without membrane bound nucleus. How does the chromatin change during cell division. List the enzymes present in lysozyme. Also, explain why lysosomes are called the suicidal bags of cell. Write one difference between leucoplasts and chromoplasts. Neatly draw the diagram of nucleus and label six parts. Give one difference between nucleoplasm and cytoplasm. Explain two functions of centrosomes. Write the types of endoplasmic reticulum. Also, explain the functions of endoplasmic reticulum. Photosynthesis is carried out by which part of bacterial cell. Write four differences between eukaryotic and prokaryotic cell. What does division labour mean. How is osmosis different from diffusion?.
