Practice MCQ Questions and answers on Biology-GK

The feeding mechanism is of several types. If it is entirely plant-like (photosynthesis),it is called holophytic. It is entirely (holo) animal-like (zoic), that is devouring already existing food, it is called holozoic.

Carbohydrates are organic molecules that consist of carbon, hydrogen, and oxygen. They are made up of repeating units called saccharides. They provide cells with energy, store energy, and form structural tissues.

The energy released by 1 gram of glucose is 4 kcal.

Among the given nutrients, milk is a poor source of Vitamin C.

Water is a nutrient that makes up 60% of our body weight.

Vitamin D is the sunshine vitamin that has been produced on this earth for more than 500 million years. During exposure to sunlight 7-dehydrocholesterol in the skin absorbs UV B radiation and is converted to previtamin D3 which in turn isomerizes into vitamin D3.

According to Stokes, folic acid may function in an enzyme system responsible for the synthesis of thymine, which in turn is used for forming nucleic acids.

Metabolism is the set of life-sustaining chemical transformations within the cells of organisms. The three main purposes of metabolism are the conversion of food/fuel to energy to run cellular processes, the conversion of food/fuel to building blocks for proteins, lipids, nucleic acids, and some carbohydrates, and the elimination of nitrogenous wastes.
Younger people have faster metabolism than adults. Hence, the given statement 'Younger people generally have a slower metabolism than adults' is false.

The body uses fat as a fuel source, and fat is the major storage form of energy in the body. Fat also has many other important functions in the body, and a moderate amount is needed in the diet for good health.

Vitamin K is required for blood clotting.