Life Processes
Frequently Asked Questions
Life processes are essential functions like nutrition, respiration, transportation, and excretion needed for living beings to surviveimage.jpg?learncbse?.
Life processes keep organisms alive by providing nutrients, energy, and waste elimination required for growth and survivalimage.jpg?learncbse+1?.
Nutrition involves acquiring and utilizing food. Plants use autotrophic nutrition, while animals use heterotrophic nutritionlearncbse+1?.
Autotrophs make food using sunlight, water, and CO2. Heterotrophs depend on consuming other living things for foodscribd+2?.
Photosynthesis is the process in which plants convert CO2 and water into carbohydrates using sunlight and chlorophyllimage.jpg?learncbse?.
The stages include ingestion, digestion, absorption, assimilation, and egestionlearncbse+1?.
Respiration releases energy from food. Aerobic uses oxygen, anaerobic does notallen+1?.
Aerobic uses oxygen, yields more energy; anaerobic is without oxygen and yields less energyallen+1?.
Organs like the nose, trachea, lungs, and alveoli help exchange gases and support respirationallen+1?.
Movement of nutrients, gases, and waste—through blood in humans, xylem and phloem in plantsimage.jpg?learncbse?.
Excretion removes metabolic wastes; egestion removes undigested food from the digestive tractlearncbse+1?.
Amoeba uses pseudopodia to engulf food, digests it in vacuoles, absorbs nutrients, and ejects wastelearncbse?.
ATP stores and transfers energy produced during respiration for cellular activitieslearncbse?.
Life processes, nutrition, photosynthesis, respiration, aerobic, anaerobic, transportation, excretion, autotrophic, heterotrophic, ATPimage.jpg?learncbse+2?
Living beings show features like movement, growth, respiration, and other life processes, even if not always visible externally?.
Diffusion is too slow and inefficient for large, complex bodies; a circulatory system efficiently delivers oxygen and nutrients?.
Plants need carbon dioxide from air, water from soil, and sunlight. Chlorophyll in leaves captures sunlight for the process?.
Nutrition provides energy, helps growth and repair, and supports all body functions by supplying essential nutrients?.
Major steps: ingestion, digestion, absorption, assimilation, and egestion?.
Hydrochloric acid kills harmful microbes in food and activates pepsin, an enzyme needed for protein digestion?.
Digestive enzymes speed up the breakdown of complex food into simpler, absorbable molecules?.
Villi are finger-like projections in the small intestine that increase surface area for nutrient absorption?.
It transports oxygen, nutrients, hormones, and waste products throughout the body?.
Translocation is the movement of food (mainly sucrose) through the phloem from leaves to other plant parts?.
Xylem transports water and minerals from roots to other parts of the plant?.
Plant respiration occurs at a lower rate and in all parts (leaves, stems, roots), while animals use specialized organs like lungs or gills?.
Plants excrete wastes through diffusion, storage in leaves (which later shed), and by conversion into chemicals like resins and gums?.
It consists of kidneys, ureters, urinary bladder, and urethra; kidneys filter blood to form urine?.
Rhythmic muscular contractions called peristalsis push food along the digestive tract?.
Terrestrial organisms use atmospheric oxygen, which is more readily available than dissolved oxygen in water for aquatic organisms?.
Cuscuta (dodder plant), ticks, and leeches obtain nutrients from other living hosts?.
ATP carries and provides energy for all cellular activities—a fundamental molecule for life?.
Blood plasma transports nutrients, hormones, and waste products; it also helps in temperature regulation?.
Arteries carry blood away from the heart under high pressure, veins bring it back under lower pressure, often with valves to prevent backflow?.
Lymph is a colorless fluid derived from blood plasma that transports nutrients and immune cells and helps remove waste from tissues?.
Amoeba and other unicellular organisms take in food, exchange gases, and remove wastes via diffusion across the cell membrane?.
The small intestine’s length provides a large surface area for complete digestion and absorption of nutrients?.
Aerobic: carbon dioxide, water, energy (ATP). Anaerobic: lactic acid (in animals) or ethanol and CO2 (in yeast/plants), plus less energy?.
