CSS General Science & Ability Set-4

Astronomy is widely considered the oldest science because ancient civilizations, such as the Babylonians, Egyptians, and Greeks, relied on the observation of celestial bodies for navigation, timekeeping, and agricultural planning. These early systematic observations of the sun, moon, and stars laid the groundwork for scientific inquiry long before the formal development of modern biology or chemistry, making it the foundational discipline for human scientific understanding.

Water is essential for all known forms of life, serving as the primary solvent for biochemical reactions, a medium for nutrient transport, and a key component in thermoregulation. While food, shelter, and reproduction are important for long-term survival and propagation, water is the most immediate and critical requirement for maintaining cellular function and life itself.

Water is essential for life as it acts as a universal solvent, facilitating critical physiological processes. It regulates body temperature, transports nutrients and oxygen to cells, aids in digestion, and removes waste products. While it does not provide energy or directly build tissue, it is vital for controlling and maintaining these life-sustaining functions.

An electrocardiogram, commonly abbreviated as ECG or EKG, is a medical diagnostic tool that records the electrical signals generated by the heart muscle during each heartbeat. By analyzing these signals, healthcare professionals can identify various cardiac conditions, such as arrhythmias, heart attacks, and other structural or functional abnormalities within the heart's conduction system.

An autopsy, also known as a post-mortem examination, is a specialized surgical procedure performed on a deceased body. The primary purpose of this examination is to determine the exact cause, mode, and manner of death, as well as to evaluate any disease or injury that may have been present. It is a critical tool in both clinical medicine and forensic science.

Stainless steel is widely utilized in orthopedic surgery for pins and plates due to its high mechanical strength, durability, and resistance to corrosion within the human body's biological environment, ensuring long-term stability for bone healing.

Dialysis is a life-saving medical procedure used when the kidneys can no longer function adequately. It works by artificially filtering the blood to remove waste products, excess salts, and water that the body cannot eliminate on its own. This process is essential for patients suffering from chronic or acute kidney failure to maintain homeostatic balance.

The term 'test-tube baby' refers to the process of in vitro fertilization (IVF). Fertilization of the ovum by sperm takes place in a laboratory setting, typically in a petri dish or test tube. Once the embryo reaches a specific stage of development, it is implanted into the mother's uterus for gestation.

Southern blotting is a molecular biology technique developed by Edwin Southern. It is used to detect specific DNA sequences within a complex mixture of DNA fragments. In DNA fingerprinting, this method allows researchers to identify unique patterns of DNA fragments, which are essential for forensic identification and genetic analysis.

Dmitry Mendeleev presented his periodic table to the Russian Chemical Society in 1869. His work was revolutionary because he arranged elements by atomic weight and left gaps for elements that had not yet been discovered, correctly predicting their properties.