Class 7 CBSE Science Complete Revision Notes
1. Nutrition in Plants
Photosynthesis: Sunlight + CO2 + Water + Chlorophyll -> Glucose + Oxygen. Types: parasitic,
saprotrophic, insectivorous.
2. Nutrition in Animals
Digestive system: Mouth, oesophagus, stomach, small intestine, large intestine. Ruminants chew
cud.
3. Heat
Heat flows hot to cold. Modes: conduction, convection, radiation.
4. Acids, Bases and Salts
Acids turn blue litmus red. Bases turn red litmus blue. Neutralization forms salt and water.
5. Physical and Chemical Changes
Physical: no new substance. Chemical: new substance formed.
6. Respiration
Glucose + Oxygen -> Carbon dioxide + Water + Energy. Aerobic and anaerobic respiration.
7. Transportation
Heart pumps blood. Xylem carries water. Phloem carries food.
8. Reproduction in Plants
Sexual and asexual reproduction. Pollination transfers pollen.
9. Motion and Time
Speed = Distance / Time.
10. Electric Current
Heating and magnetic effects. Fuse protects circuits.
11. Light
Angle of incidence equals angle of reflection. Plane mirror forms virtual, erect image.
12. Forests
Forests conserve biodiversity, soil and water.
13. Wastewater Story
Treatment: screening, sedimentation, aeration, disinfection.
1. Nutrition in Plants
Photosynthesis: Sunlight + CO2 + Water + Chlorophyll -> Glucose + Oxygen. Types: parasitic,
saprotrophic, insectivorous.
2. Nutrition in Animals
Digestive system: Mouth, oesophagus, stomach, small intestine, large intestine. Ruminants chew
cud.
3. Heat
Heat flows hot to cold. Modes: conduction, convection, radiation.
4. Acids, Bases and Salts
Acids turn blue litmus red. Bases turn red litmus blue. Neutralization forms salt and water.
5. Physical and Chemical Changes
Physical: no new substance. Chemical: new substance formed.
6. Respiration
Glucose + Oxygen -> Carbon dioxide + Water + Energy. Aerobic and anaerobic respiration.
7. Transportation
Heart pumps blood. Xylem carries water. Phloem carries food.
8. Reproduction in Plants
Sexual and asexual reproduction. Pollination transfers pollen.
9. Motion and Time
Speed = Distance / Time.
10. Electric Current
Heating and magnetic effects. Fuse protects circuits.
11. Light
Angle of incidence equals angle of reflection. Plane mirror forms virtual, erect image.
12. Forests
Forests conserve biodiversity, soil and water.
13. Wastewater Story
Treatment: screening, sedimentation, aeration, disinfection.
