Biology

The ostrich is the largest bird in the world by height and weight, making it the correct answer. Eagles, emus, and albatrosses are all smaller in comparison.

The Rafflesia is known as the largest flower in the world, with some species producing flowers over 1 meter in diameter, much larger than sunflowers, lotuses, or roses.

The blue whale is the largest animal in the world, reaching lengths of up to 100 feet and weights of up to 200 tons, which is much larger than elephants, giraffes, or hippopotamuses.

Vitamin D is synthesized in the skin when it is exposed to sunlight, specifically ultraviolet B (UVB) rays. The other vitamins listed are not produced in the skin in response to sunlight.

Normal human body temperature is commonly accepted as 98.6°F, which is equivalent to 37°C. This is a standard conversion in both medical and scientific contexts.

The average normal body temperature for a healthy adult is 98.6°F. This value is widely accepted in medical science as the standard normal temperature.

The word 'virus' is derived from Latin, where it originally meant 'poison' or 'slimy liquid.' It was later adopted into English and other languages to refer to infectious agents.

All three species—the Blue Whale, Green Sea Turtle, and Dugong—are known to inhabit or migrate through the Arabian Sea, making 'All of the above' the correct answer.

Authoritative sources including clinical and physiology references confirm that approximately 99% of the body's calcium is stored in bones and teeth, while about 1% of total calcium is present in the blood and extracellular fluid. The blood calcium exists in three forms: about 40% bound to proteins, 10% complexed with anions, and 50% as free ionized calcium. Therefore, the correct answer to the question about the percentage of total calcium present in the blood is about 1%, corresponding to option C.

Phycology is the branch of biology that deals with the scientific study of algae. The other options refer to different fields: Pomology is the study of fruit, Oneriology is the study of dreams, and Trichology is the study of hair and scalp.