Tag: science & technology

Galileo made multiple significant contributions to astronomy and science. He discovered four moons of Jupiter, developed telescope improvements, and studied pendulum motion. The question asks which statement describes him, and since all listed achievements (A, B, C) are correct, option D 'All are correct' is the right choice.

Roald Amundsen, a Norwegian explorer, was the first person to reach the South Pole on December 14, 1911. Option B correctly identifies Capt. Amundsen as the answer. Option D's Edmund Hillary is famous for climbing Everest, not the South Pole.

Glands are specialized organs that manufacture and secrete chemical substances like hormones, enzymes, or other fluids. Examples include sweat glands, salivary glands, and endocrine glands like the thyroid.

Exocrine glands have ducts that carry their secretions to specific locations. Examples include sweat glands, salivary glands, and the liver. Endocrine glands are ductless and release hormones directly into the bloodstream.

Ductless glands are endocrine glands that secrete hormones directly into the blood. While the pancreas is both exocrine and endocrine, it is the only option here that functions as a ductless gland. Liver, lachrymal, and sweat glands use ducts.

The thyroid gland produces hormones (T3 and T4) that primarily regulate the body's metabolic rate. Adrenal glands handle stress response, gonads handle reproduction, and lachrymal glands produce tears.

The lacrimal glands (lachrymal glands) are situated above each eye and secrete tears. Tears keep the eyes moist, provide nutrients, and help remove foreign particles. The pituitary, thymus, and adrenal glands are endocrine glands with different functions.

The pituitary gland is often called the 'master gland' because it produces hormones that control other endocrine glands and regulates growth, metabolism, and reproduction. It secretes thyroid-stimulating hormone (TSH), adrenocorticotropic hormone (ACTH), and growth hormone (GH), among others.

Endocrine glands secrete hormones directly into the bloodstream in response to instructions from the hypothalamus and pituitary gland. This is different from exocrine glands (like sweat glands) which secrete substances through ducts, making 'endocrine glands' the correct answer.