Tag: evs

The meal that includes all the nutrients namely, carbohydrates, proteins, fats, vitamins and minerals in a required balanced proportion is known as a balanced diet.

Nutrients are substance present in food and essential to life and health. They provide energy, building blocks for repair and growth and are necessary to carry out a chemical process.

Nutrients are substance present in food essential to survive, growth and health. They include macronutrients i.e, consumed in large amounts like carbohydrates, proteins and fats. And micronutrients i.e consumed small amounts like vitamins and minerals.

Nutrients are compounds in food, essential to life and health, providing us with energy, a building block for repair and growth and substance necessary to regulate the chemical process.

Nutrients are essential to survive and grow for an organism. A balanced diet provides the body nutrients it needs to function properly. Hence, a balanced diet is a good source of nutrients.

The process of nourishing or being nourished, especially the process by which a living organism assimilates food and uses it for growth and for replacement of tissues

•  The four major structural elements in the human body by weight  (oxygen, hydrogen, carbon, and nitrogen), are usually not included in lists of major nutrient minerals.
• As a group, minerals are one of the four groups of essential nutrients, the others of which are vitamins, essential fatty acids, and essential amino acids
• The five major minerals in the human body are calcium, phosphorus, potassium, sodium, and magnesium All of the remaining elements in a human body are called "trace elements". The trace elements are sulfur, iron, chlorine, cobalt, copper, zinc, manganese, molybdenum, iodine and selenium. Hence, silicon is not a major nutrient for the body.
  

The leaf on the right shows a positive test for starch in the areas which contained chlorophyll, and a negative test for starch in the areas which lack chlorophyll. This is evidence that chlorophyll is required for photosynthesis. A plant can be 'de-starched' by leaving it in the dark for a few hours. So, the correct option is "C" (Starch will be found only in the part of the leaf exposed to light).

The iodine test is used for the determination of the presence of starch in a sample. Molecular iodine is not soluble in water and hence potassium iodide is added to it. Together they form polyiodide complex which upon addition of starch turns intense blue-black colour. Starch is a polymer of amylose and amylopectin, of which amylose is responsible for the blue colour of the reaction. In the absence of starch solution remain as light brown colour which is the colour of iodine solution.