Life processes are the essential activities that all living organisms perform to stay alive. These processes help organisms to grow, get energy, remove waste, and reproduce.
Main Life Processes:
- Nutrition – Taking in food and using it for energy and growth.
- Respiration – Breaking down food to release energy.
- Transportation – Movement of food, water, and other substances inside the body.
- Excretion – Removal of waste products from the body.
These processes are continuous and necessary for the survival of all living beings.
Example: Humans eat food (nutrition), breathe in oxygen (respiration), blood carries nutrients (transportation), and kidneys remove waste (excretion).
Practice Questions PDF
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Questions on Life Processes
Showing 31–60 of 6031.A patient is diagnosed with kidney failure and undergoes dialysis. Explain the principle behind artificial kidney (dialysis) treatment. 32.Assertion (A): Veins have valves while arteries do not. Reason (R): Valves in veins prevent the backflow of blood, especially against gravity, as blood pressure is low in veins. 33.Which part of the digestive system absorbs the maximum amount of water from undigested food? 34.What is the primary role of guard cells in plant leaves? 35.Describe the role of gastric glands in the human digestive system. 36.A person experiences symptoms like yellowish skin and eyes, and dark urine. Which organ is most likely malfunctioning? 37.Which of the following processes in plants requires energy (ATP) for the movement of substances? 38.Why is the left ventricle of the human heart thicker and more muscular than the right ventricle? 39.What happens to excess amino acids in the human body? 40.Explain how the large surface area for gas exchange is achieved in human lungs. 41.Why do aquatic organisms breathe much faster than terrestrial organisms? 42.A student observes that a healthy potted plant, when watered appropriately, still shows wilting during the hottest part of a summer day. Which process is most likely occurring at a higher rate than water absorption? 43.Which of the following is a primary function of xylem tissue in plants? 44.What would happen if the epiglottis failed to function properly during swallowing? 45.Why is it essential for plants to have stomata? 46.Assertion (A): Anaerobic respiration releases less energy than aerobic respiration. Reason (R): In anaerobic respiration, glucose is not completely broken down in the absence of oxygen. 47.Which of the following is an adaptation of the small intestine for efficient absorption of digested food? 48.A student observes a plant kept in a sealed transparent container. After some time, droplets of water appear on the inner surface of the container. What biological process is demonstrated here? 49.What would be the likely consequence if a person's lymphatic system were severely impaired? 50.Name the substance that prevents blood clotting inside the human body. 51.If the Bowman's capsule and glomerulus are collectively referred to as the renal corpuscle, which part of the nephron is primarily responsible for selective reabsorption of useful substances like glucose and amino acids? 52.Why do walls of the trachea have C-shaped cartilaginous rings? 53.In an experiment, if a plant is defoliated (leaves removed), how would this immediately affect the rate of water absorption by its roots? 54.Which of the following statements correctly describes the role of bile in the digestion of food? 55.During vigorous exercise, muscles may respire anaerobically. What is the end product of anaerobic respiration in human muscles, and what is its consequence? 56.A person suffers from a condition where their blood is unable to clot effectively after an injury. Which component of the blood is most likely deficient or malfunctioning? 57.Assertion (A): Human beings have a double circulatory system. Reason (R): In a double circulatory system, blood goes through the heart twice during each cycle, once for pulmonary circulation and once for systemic circulation. 58.Why is the inner lining of the small intestine folded into numerous finger-like projections called villi? 59.A student performs an experiment to study photosynthesis. They keep a potted plant with variegated leaves (some parts green, some non-green) in a dark room for 48 hours and then expose it to sunlight for 6 hours. After performing the iodine test, which part of the leaf would show the presence of starch and why? 60.Which of the following processes in plants involves the movement of water and dissolved minerals from the roots to the leaves against gravity?