NCERT SCIENCE NOTES CLASS 7 CHAPTER 18
Wastewater Story Water – Our Lifeline Sewage Types of Impurities Examples Organic impurities Human faeces, animal wastes, oil, urea, pesticides, herbicides, fruit and vegetable wastes Inorganic impurities Nitrates, phosphates, metals Nutrients Phosphorus and nitrogen Bacteria Those which cause diseases such…
NCERT SCIENCE NOTES CLASS 7 CHAPTER 17
Forests: Our Lifeline There are three major types of forests- tropical, temperate and boreal forests. Forest profile There are different kinds of plants of varied height and size in the forests. Parts of a tree above the stem, including the…
NCERT SCIENCE NOTES CLASS 7 CHAPTER 16
Water: A Precious Resource Water Cycle Uses of water Body functions Plants need water to prepare their own food and for germination of seeds. Animals and human beings need water for digestion and absorption of nutrients. Domestic use We need…
NCERT SCIENCE NOTES CLASS 7 CHAPTER 15
Light Reflection of Light Laws of Reflection The laws of reflection are: Types of Reflection Regular Reflection Irregular Reflection or Diffused Reflection Left-Right Inversed Characteristics of an Image Spherical Mirrors There are two types of spherical mirrors: Concave Mirror Uses…
NCERT SCIENCE NOTES CLASS 7 CHAPTER 14
Electric Current and its Effects Electric Current The flow of charges through a circuit is called electric current. The SI unit of electric current is ampere and donated by A. The direction of the electric current is conventionally from the…
NCERT SCIENCE NOTES CLASS 7 CHAPTER 13
Motion and Time Motion Examples: Chairs of a dining table, a flower vase, table, blackboard etc. Examples: The blades of a rotating fan, the hands of a working wall clock etc. Slow and Fast Motion Rectilinear Motion Circular Motion Rotational…
NCERT SCIENCE NOTES CLASS 7 CHAPTER 12
Reproduction in Plants Asexual Reproduction Vegetative Propagation (a) Vegetative Propagation by Stems The stems (or branches) of plants normally bear buds in the axils which can be used in vegetative propagation to produce new plants. New plants can be obtained…
NCERT SCIENCE NOTES CLASS 7 CHAPTER 11
Transportation in Animals and Plants Circulatory System Blood Blood Vessels Heart The arteries and veins in the heart connect to other parts of the body. The blood vessels that enter or leave the heart are: Vena cava: It is a…
NCERT SCIENCE NOTES CLASS 7 CHAPTER 10
Respiration in Organisms What is Respiration? Anaerobic Respiration in Muscles We (human beings) normally obtain energy by aerobic respiration. But under certain conditions (when extra energy is needed), anaerobic respiration can take place in our muscles for a short time….
NCERT SCIENCE NOTES CLASS 7 CHAPTER 9
Soil Soil Profile Types of Soil Properties of Soil Soil and Crops Type of soil Crops grown Clayey and loamy soil They are suitable for growing cereals such as wheat and gram due to good water-retaining capacity. Loamy soil It…