NCERT Books

Exercise 1 Solution A. (a) Old newspapers (a) plastics Solution B.1. (a) Sludge(b) Scrubber, Plate type electrostatic precipitator Solution B.2. (a) True(b) True(c) False. Electricity is one of the secondary needs of human society. Solution B.3. Column I Column II 1. Cow dung (iii) Manure(i) Sugarcane 2. Bagasse (i) Sugarcane 3. Old newspapers (ii) Raddiwalas(i) […]

Exercise 1 Solution A. (a) May 8 (c) Geneva Solution B.1. Column I (Activity) Column II (Organisation) (i) To extend relief to victims of earthquake. Red Cross (ii) To lay pharmaceutical standards for important drugs. WHO (iii) Arranging ambulance in emergencies. Red Cross (iv) To suggest quarantine measures. WHO (v) Training of midwives. Red Cross […]

Exercise 1 Solution A. (c) An antibiotic (c) Tetanus (a) April 7 Solution B.1. (a) Arsphenamine or Salvarsan (b) Penicillin (c) Passive acquired immunity (d) Antiseptics – Lysol, iodine, boric acid and carbolic acid Disinfectants – Cresol and phenol Antibiotics – Ampicillin and penicillin (e) Oral polio vaccine (OPV) Solution B.2. (i) Acquired Immuno Deficiency […]

Exercise 1 Solution A. (c) pandemic (d) Bacillus (d) AIDS (c) Anopheles mosquito (d) Entamoeba Solution B.1. (a) F (False). Filariasis is transmitted by the Culex mosquito. (b) T (True) (c) F (False). BCG vaccine is used for tuberculosis. (d) F (False). Louis Pasteur discovered a cure for rabies. (e) F (False). AIDS is caused […]

Exercise 1 Solution A. (d) cholera (d) Sharing towels with others (d) Plasmodium (c) Fluorides (b) Bacteria Solution B.1. Column I Column II (Answers) (a) Mosquito (iv) Malaria (b) Plasmodium (iii) Vector (c) Entamoeba histolytica (v) Dysentery (d) Aedes mosquito (ii) Dengue (e) Insecticide (i) DDT Solution B.2. (a) Vectors (disease carriers) (b) Pathogens (c) […]

Exercise 1 Solution A.1. (b) contracts (a) alveoli (b) loss in dry weight Solution B.1. (a) Diaphragm(b) Ethyl alcohol(c) Diffusion(d) Diffusion(e) Hypoxia(j) Vocal cord Solution B.2. (a) Epiglottis(b) Capillaries(c) Diaphragm(d) Bronchioles(e) Ribs(f) Alveoli or air sacs Solution B.3. COMPONENT INSPIRED AIR EXPIRED AIR 1. Oxygen 20.96% 16.40% 2. Carbon dioxide 0.04% 4.00% 3. Nitrogen 79.00% […]

Exercise 1 Solution A. (d) the skin will turn dry and rough (b) Albinism, Leucoderma (c) Skin (b) Dermis (d) Palm Solution B.1. Hypothalamus, a portion of the forebrain is the principal body heat regulating centre in our brain. Solution B.2. Modified sweat gland: Mammary glandModified sebaceous gland: Ceruminous gland Solution B.3. Sebaceous glands Solution […]

Exercise 1 Solution A. (b) Cartilage (d) Hip (a) Cervical-7 (b) Ear ossicles Solution B.1. Parts of the skeleton Location Transverse process Neural arches in vertebra Glenoid cavity Pectoral girdle Shoulder-blade Shoulder girdle Acetabulum Pelvic girdle Solution B.2. External Ear Tip of the nose Solution C.1. True rib Floating rib 1. The first seven pairs […]

Exercise 1 Solution A. (iii) stomach into intestine (i) HCl and pepsin (iii) colon (iii) Premolars, molars – Grinding Solution B.2. The two reflexes which occur when a person chews and swallows food are: Reflex when a person chews – Secretion of saliva Reflex when a person swallows – Tongue presses upward and back against […]