Class 10 Science - Life Processes | Assignment

University:
High School
Course:
High School Biology
Academic year:

2025
Views:

426

Pages:

3
Author:

Vaishali more

Class 10 Science - Life Processes Premium CBSE Revision Notes What are Life Processes? Life processes are activities necessary to maintain life. The four main life processes are Nutrition, Respiration, Transportation and Excretion. 1. Nutrition Nutrition is the process of obtaining food and using it for energy, growth and repair. • Autotrophic nutrition – plants make their own food. • Heterotrophic nutrition – organisms depend on others for food. • Photosynthesis requires sunlight, chlorophyll, water and carbon dioxide. • Stomata are tiny pores for gas exchange. Human Digestive System: Mouth → Oesophagus → Stomach → Small Intestine → Large Intestine → Rectum → Anus 2. Respiration • Respiration releases energy from food. • Aerobic respiration uses oxygen. • Anaerobic respiration occurs without oxygen. • Alveoli are the site of gaseous exchange. 3. Transportation • Blood transports oxygen, food and wastes. • RBCs carry oxygen. • WBCs fight diseases. • Platelets help in clotting. • Heart has four chambers. • Xylem transports water and minerals. • Phloem transports food. 4. Excretion • Excretion removes harmful metabolic wastes. • Kidneys filter blood and form urine. • Nephron is the structural and functional unit of kidney. • Urine formation: Filtration → Reabsorption → Secretion. • Dialysis is used when kidneys fail. Quick Revision • Photosynthesis occurs in leaves. • Salivary amylase digests starch. • Pepsin digests proteins. • Small intestine is the main absorption site. • Alveoli exchange gases. • Heart shows double circulation. • Xylem carries water; phloem carries food. • Nephron forms urine.