Life Processes 1 : CBSE Class 10 X Science (Biology) Video Lecture

Ans. The five life processes are: 1. Nutrition: It involves the intake of food, digestion, absorption of nutrients, and utilization of these nutrients by the body. 2. Respiration: It is the process of inhaling oxygen and exhaling carbon dioxide. It occurs in cells and involves the release of energy from nutrients. 3. Excretion: It is the removal of waste products from the body. Excretion helps maintain the body's internal environment by eliminating harmful substances. 4. Transportation: It is the movement of substances like nutrients, gases, and waste products throughout the body. Blood plays a crucial role in the transportation process. 5. Reproduction: It is the process by which organisms produce offspring of their own kind. Reproduction ensures the continuation of the species.

Ans. Nutrition is essential for life processes because: 1. It provides energy: Nutrients like carbohydrates, proteins, and fats are broken down during digestion to release energy. This energy is required for various activities of the body. 2. It supports growth and development: Nutrients contain essential components like proteins, vitamins, and minerals that are necessary for the growth and development of the body. 3. It maintains good health: A balanced diet provides the body with the necessary nutrients, which help in maintaining good health and preventing diseases. 4. It strengthens the immune system: Proper nutrition strengthens the immune system, making the body more resistant to infections and diseases. 5. It aids in repair and maintenance: Nutrients play a crucial role in the repair and maintenance of body tissues. They help in the regeneration of cells and the healing of wounds.

Ans. Respiration is vital for life processes because: 1. It provides energy: During respiration, glucose is broken down in the presence of oxygen to release energy in the form of ATP (Adenosine Triphosphate). This energy is utilized by cells for various activities. 2. It removes waste products: Respiration helps in the elimination of carbon dioxide, a waste product of cellular metabolism. Accumulation of carbon dioxide can be harmful to the body. 3. It supports growth and repair: The energy produced during respiration is used for the growth and repair of body tissues. It aids in the synthesis of new molecules and the regeneration of cells. 4. It maintains body temperature: Respiration generates heat as a byproduct, which helps in maintaining the body's temperature. It prevents the body from becoming too cold or too hot. 5. It sustains life: Respiration is essential for the survival of organisms. Without respiration, cells would not receive the required oxygen and energy production would cease, leading to death.

Ans. Transportation plays a crucial role in the functioning of life processes because: 1. It transports oxygen: Oxygen is transported from the lungs to all the cells of the body through the circulatory system. It is necessary for cellular respiration and the production of energy. 2. It carries nutrients: Nutrients obtained from food are transported to different parts of the body through the bloodstream. These nutrients are essential for growth, repair, and maintenance of body tissues. 3. It removes waste products: Waste products like carbon dioxide, urea, and excess water are transported to excretory organs for elimination. Transportation helps in the efficient removal of waste from the body. 4. It distributes hormones: Hormones produced by various glands are transported through the bloodstream to target organs or tissues. Hormones regulate various bodily functions and maintain homeostasis. 5. It aids in immune responses: White blood cells, antibodies, and other immune system components are transported to the sites of infection or injury through the circulatory system. This helps in combating pathogens and promoting healing.

Ans. Excretion is important for the proper functioning of life processes because: 1. Removal of metabolic waste: Excretion helps in removing metabolic waste products like carbon dioxide, urea, and excess water from the body. Accumulation of these waste products can be toxic and harmful to the body. 2. Maintaining homeostasis: Excretion helps in maintaining the body's internal environment by regulating the balance of water, electrolytes, and pH levels. It ensures stability and optimal functioning of body systems. 3. Elimination of toxins: Excretion eliminates toxins and harmful substances from the body. This includes drugs, pollutants, and other foreign substances that may enter the body through various sources. 4. Regulation of blood pressure: The excretory system plays a role in regulating blood pressure by controlling the balance of water and sodium in the body. Excretion of excess water and sodium helps maintain blood pressure within a normal range. 5. Prevention of diseases: Proper excretion prevents the accumulation of waste products, which can lead to various diseases and disorders. It helps in maintaining overall health and well-being.