Chapter ten Lenses part 1.

Chapter ten Lenses part 1.

Chapter Nine Source and effects of heat energy part 4

Chapter Nine Source and effects of heat energy part 2

Chapter Nine Source and effects of heat energy part 3

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.

Chapter ten Lenses part 3.

Chapter ten Lenses part 2.

Chapter Twleve Investigating the Space part4

Chapter Twleve Investigating the Space part3

Chapter Twleve Investigating the Space part 2

Chapter Twleve Investigating the Space.

Chapter Eleven Energy and Current

Chapter Eleven

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