This chapter contains important concepts related to process of respiration, breathing, aerobic and anaerobic respiration, respiration in plants, respiration in amoeba, respiration in earthworm, respiration in fish and respiration in humans.

This chapter contains important concepts related to process of nutrition in various organisms, modes of nutrition: autotrophic nutrition, heterotrophic nutrition, saprotrophic nutrition, parasitic nutritio and holozoic nutrition, process of photosynthesis in plants, nutrition in animals, herbivores, carnivores and omnivores, phagocytosis in amoeba and human digestive system.

This chapter contains important concepts related to blood circulatory sytem and lymphatic system, transport in plants, xylem vessels, phloem vessels, ascent on sap, blood and its components and human circulatory system 

This chapter contains important concepts related with Control and co-ordination in animals and plants, Tropic movements in plants; Introduction to plant hormones; control and co-ordination in animals: the nervous system; voluntary, involuntary and reflex action, chemical co-ordination: animal hormones.

This chapter contains important concepts related with eco-system, Environmental problems, Ozone depletion, waste production and their solutions. Biodegradable and non-biodegradable substances.

This chapter contains important concepts related with Heredity; Mendel’s contribution- Laws for inheritance of traits: Sex determination: brief introduction; Basic concepts of evolution.

This chapter contains important concepts related with magnetic field, field lines, field due to a current carrying conductor, field due to current carrying coil or solenoid; Force on current carrying conductor, Fleming’s left hand rule. Electromagnetic induction. Induced potential difference, Induced current. Fleming’s Right Hand Rule, Direct current. Alternating current : frequency of AC. Advantage of AC over DC. Domestic electric circuits.

This chapter contains important concepts related with Chemical equation, Balanced chemical equation, implications of a balanced chemical equation, types of chemical reactions: combination, decomposition, displacement, double displacement, precipitation, neutralization, oxidation and reduction.

This chapter contains important concepts related with Covalent bonding in carbon compounds. Versatile nature of carbon. Homologous series Nomenclature of carbon compounds containing functional groups (halogens, alcohol, ketones, aldehydes, alkanes and alkynes), difference between saturated hydrocarbons and unsaturated hydrocarbons. Chemical properties of carbon compounds (combustion, oxidation, addition and substitution reaction). Ethanol and Ethanoic acid (only properties and uses), soaps and detergents.

This chapter contains important concepts related with Periodic classification of elements: Need for classification, Modern periodic table, gradation in properties, valency, atomic number, metallic and non-metallic properties.