CLASS X BIOLOGY

KEY CONCEPTS & GIST OF THE LESSON v   Life processes – The processes that are necessary for an organism to stay alive. Eg. Nutrition, respiration, etc. v   Criteria of life - (i) Growth  (ii) Movement v   Nutrition - The process in which an organism takes in food, utilizes it to get energy, for growth, repair and maintenance, etc. and excretes the waste materials from the body. v   Types of nutrition                                                                           1.        Autotrophic nutrition (Auto =self:  trophos = nourishment) E.g. Plants, Algae, blue green bacteria. o    Process – Photosynthesis(Photo=light; Synthesis= to combine) o    Raw materials- (i) Carbon dioxide (ii)Water o    Equation-                   sunlight                                                                           o     6CO 2   +  6H 2 O                                     C 6 H 12 O 6      +     6O 2                                        Chlorophyll o    Energy

Chapter Life Processes Revision of Nutrition , Respiration Circulatory System in Humans :Significance of circulatory system, Structure of human heart , No of chambers in heart of fish, amphibia, reptiles birds and mammals, Blood flow through heart, Single/ Double circulation, Presence of valves and their function, Types of Blood vessels , Arteries vs Veins, capillaries, Blood components, Blood pressure, Lymph - formation and function. Transport in Plants : Vascular Tissues:  Xylem and Phloem, Transport in xylem due to root pressure and transpirational pull, Transport in phloem- Translocation.