Answer: (A) Vitamin K
Explanation: Vitamin K is crucial for blood clotting as it is necessary for synthesizing proteins involved in the clotting process. Without adequate Vitamin K, blood clotting can be impaired, leading to excessive bleeding.

Answer: (B) Acting as an antioxidant
Explanation: Vitamin E primarily functions as an antioxidant in animals. It helps protect cells from oxidative damage by neutralizing free radicals, which can prevent cell damage and support overall health. While vitamin E may have other roles, its most significant function is its antioxidant activity.

Answer: (A) Trypsin
Explanation: Trypsin is an enzyme involved in protein digestion, not a vitamin. Ascorbic acid (Vitamin C), riboflavin (Vitamin B2), and niacinamide (a form of Vitamin B3) are all vitamins essential for various bodily functions.

Answer: (D) Liver
Explanation: Liver is the richest source of vitamin A among the options provided. It contains a high concentration of preformed vitamin A (retinol), which is more efficiently absorbed by the body compared to the provitamin A found in plant-based sources like oranges and apples. While eggs also contain vitamin A, liver provides the highest levels.

Answer: (A) Vitamin D
Explanation: Vitamin D is the vitamin produced in response to sunlight. When UV rays from the sun hit the skin, they trigger the synthesis of vitamin D, which is essential for calcium absorption and bone health. Unlike vitamins A, B, and C, which are obtained from dietary sources, vitamin D’s production is uniquely stimulated by exposure to sunlight.

Answer: (A) All food nutrients necessary for growth and maintenance
Explanation: A balanced diet includes all essential nutrients required for the body’s growth, maintenance, and overall health. This includes a proper mix of macro and micro nutrients from various food sources, ensuring that all nutritional needs are met. Others are specific components or types of nutrients but do not encompass the complete range needed for a balanced diet.

Answer: (B) Ascorbic acid
Explanation: Ascorbic acid, commonly known as vitamin C, is not part of the vitamin B complex group. The B complex vitamins include thiamine (B1), riboflavin (B2), and folic acid (B9). Vitamin C is a separate vitamin with different functions, such as acting as an antioxidant and supporting the immune system.

Answer: (B) Vitamin C
Explanation: Vitamin C is a water-soluble vitamin, which means it is not stored in the liver or other tissues in significant amounts. Instead, it is excreted in urine when in excess. In contrast, fat-soluble vitamins like Vitamin A, D, E, and K are stored in the liver and fatty tissues.

Answer: (A) Vitamin C
Explanation: Vitamin C is known as ascorbic acid. This vitamin is essential for the growth and repair of tissues in the body, and it plays a crucial role in the formation of collagen, an important protein for skin, blood vessels, and bones.

Answer: (B) 20
Explanation: There are 20 standard amino acids that are used to build all proteins in living organisms. These amino acids serve as the building blocks for proteins, each with a unique side chain that determines its function and properties.