Study life

 Carbon dioxide Carbon dioxide is a colourless and odourless gas. It has a slightly sour taste. Carbon dioxide is moderately soluble in water. Carbon dioxide gas neither burns nor supports burning. Carbon dioxide extinguishes a burning fire. Plants and animals consume oxygen from air for respiration and produce carbon dioxide. Plant and animal matter burns by consuming oxygen from air and produces mainly carbon dioxide and a few other gases. If some material is burning in a closed room, we feel suffocated. This is due to the accumulation of excess of carbon dioxide (and some carbon monoxide) in the air of the room which is produced by the burning material. Air contains only about 0.03 per cent of carbon dioxide gas. Though the amount of carbon dioxide in air is comparatively small but it is a very important component of air. The carbon dioxide gas present in air is important to green plants. Green plants need carbon dioxide gas to make food. In sunlight, green plants use carbon di...

 FATS Like carbohydrates, fats also provide energy to our body. In fact, fats provide us twice as much energy as that provided by the same amount of carbohydrates. For example, a little butter (which is a fat) provides us much more energy than a large slice of bread (which is a carbohydrate). Butter, ghee, groundnut oil, mustard oil, sunflower oil and coconut oil are the common fats used by us in everyday life. Fats are the richest source of energy but they are more expensive than carbohydrates. Since both, fats as well as carbohydrates provide energy, therefore, the foods containing fats and carbohydrates are called 'energy giving foods'. Fats are supplied to our body by many foods such as: Butter, Ghee, Milk, Cheese (Paneer), Oil (Groundnut oil, Mustard oil, Sunflower oil and Coconut oil, etc.), Egg yolk (yellow of an egg), Meat, Groundnut, Cashew, and Soybean. Please note that fats and oils are similar substances, the only difference being that fats are solids at room temper...