Everyday Science

Green leafy vegetables are rich sources of Vitamin A, primarily in the form of beta-carotene, which the body converts into Vitamin A. Seeds, fresh vegetables and fruits, and seafood generally contain lower amounts of Vitamin A compared to green leafy vegetables.

The famous book 'Al-Qanun' (The Canon of Medicine) was written by the Muslim scientist Abu Ali Sina, also known as Avicenna. This medical encyclopedia, completed in 1025, is one of the most influential works in the history of medicine and was used as a standard medical textbook in both the Islamic world and Europe for centuries. Zakariya Al-Razi (option B) was another prominent Muslim physician but did not author 'Al-Qanun'. Therefore, the correct answer is C, Abu Ali Sina.

A balanced diet includes all essential nutrients such as carbohydrates, fats, proteins, water, vitamins, and minerals to maintain overall health and proper body function. Therefore, 'All of these' is the correct answer as it encompasses all these components.

According to the Big Bang Theory, the Universe began approximately 13.8 billion years ago, which falls within the range of 10–20 billion years. This makes option A the correct choice.

Rubber is known for its high elasticity, meaning it can stretch significantly and return to its original shape, unlike steel, glass, or sponge which are less elastic or deform permanently.

Glucose, galactose, and fructose are all examples of monosaccharides, which are simple sugars and the basic units of carbohydrates. Therefore, the correct answer is 'All of these'.

The freezing point of water is 0°C under standard atmospheric pressure, which is the temperature at which water changes from liquid to solid.

Comets revolve around the Sun as they orbit it in elliptical paths, just like planets, but often with more elongated orbits. This is why option A is correct.

The sun's surface is called the photosphere, which is the visible surface layer from which light is emitted. The other options refer to different atmospheric layers of the sun or Earth and are incorrect in this context.

Venus and Uranus rotate in the opposite direction (retrograde rotation) compared to most other planets in the solar system, which rotate prograde (in the same direction as their orbit around the Sun).