Tag: science & technology

'Ozone is good up high but bad nearby' correctly states that stratospheric ozone protects from UV (A), while ground-level ozone from NOx emissions worsens respiratory diseases (B, D). Option C is INCORRECT because high-altitude ozone does NOT create favorable air movement for travel - it absorbs UV, affecting atmospheric circulation but not specifically 'air travel'. This tests which statement doesn't fit the science.

The Montreal Protocol (1987) is the international treaty specifically designed to phase out ozone-depleting substances like CFCs. Kyoto Protocol (1997) targets greenhouse gases, Basel Convention (1989) controls hazardous waste transport, and Ramsar Convention (1971) protects wetlands. Montreal Protocol is considered the most successful environmental treaty. This is standard environmental GK.

Red blood corpuscles (RBCs) are formed in the bone marrow through a process called erythropoiesis. In adults, this primarily occurs in flat bones like the sternum, pelvis, and ribs. The liver produces RBCs during fetal development, while kidneys produce the hormone erythropoiesis-stimulating erythropoietin but not the actual cells.

The tibia (shin bone) is found in the leg - it's the larger of the two lower leg bones connecting the knee to the ankle. The skull contains cranial and facial bones, the arm contains humerus, radius and ulna, and the face has various smaller bones. The tibia is exclusively a leg bone.

The pancreas is a dual-function organ that produces both digestive enzymes and hormones like insulin. Insulin regulates blood sugar levels by allowing cells to take in glucose. Bile juice is produced by the liver, and peptic juice refers to gastric secretions from the stomach lining.

The cerebrum is the largest part of the human brain, making up about 85% of the brain's weight. It's responsible for higher cognitive functions like thinking, reasoning, memory, and decision-making. The medulla controls vital autonomic functions, while the cerebellum coordinates movement and balance.

Calcium phosphate (specifically hydroxyapatite) is the primary mineral component of bones and teeth, providing hardness and structural strength. Calcium carbonate is found in seashells and eggshells, while calcium sulphate and nitrate are not major components of skeletal tissue.

Hemoglobin contains iron in the form of heme groups, which bind oxygen molecules for transport throughout the body. Each hemoglobin molecule contains four iron atoms. This is why iron deficiency leads to anemia - not enough iron to make functional hemoglobin.

The pituitary gland is called the 'master gland' because it secretes hormones that regulate other endocrine glands, including the thyroid, adrenals, and reproductive glands. The pancreas produces insulin and digestive enzymes, the thyroid regulates metabolism, and the spleen is part of the immune system.