Chapter four kinds of Habitats.

Chapter ten Lenses part 3.

Chapter ten Lenses part 2.

Chapter ten Lenses part 1.

Chapter Nine Source and effects of heat energy part 4

Chapter Nine Source and effects of heat energy part 3

Chapter Nine Source and effects of heat energy part 2

Chapter Nine Source and effects of heat energy part 1.

Chapter eight Measurement of Physical quantities part 2

Chapter eight Measurement physical quantities part 1

Chapter Seven Force and Pressure part 3

Chapter Seven Force and Pressure part 2

Chapter Seven Force and Pressure part 1

Chapter Six Acids Alkalis and salt part2

Chapter six Acids Bases and Alkalies part1.

Chapter four Pultant and their Environment

Chapter Five Chemical Reaction part 1

Chapter Two Heredity in Organism.

Chapter Three Biotechnology Part 2

Chapter Three Biotechnology Part 1

Chapter One Human Organ System part1.

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