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Meghna Thapar 5 years, 7 months ago
he salivary glands in mammals are exocrine glands that produce saliva through a system of ducts. Humans have three paired major salivary glands (parotid, submandibular, and sublingual) as well as hundreds of minor salivary glands. The salivary glands produce saliva, which keeps the mouth and other parts of the digestive system moist. It also helps break down carbohydrates (with salivary amylase, formerly known as ptyalin) and lubricates the passage of food down from the oro-pharynx to the esophagus to the stomach.
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Meghna Thapar 5 years, 7 months ago
The earliest evidence of silk was found at the sites of Yangshao culture in Xia County, Shanxi, where a silk cocoon was found cut in half by a sharp knife, dating back to between 4000 and 3000 BC. The species was identified as Bombyx mori, the domesticated silkworm.
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Yogita Ingle 5 years, 7 months ago
The chemical substances present in food that provides nourishment essential for the growth and maintenance of your body are called nutrients.
Your diet consists of different nutrients that can be classified as carbohydrates, fats, proteins, vitamins, water and mineral salts. The study of food and diet is known as nutrition.
Posted by Padakshi Murari 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
Silk fabric was invented in Ancient China and played an important role in their culture and economy for thousands of years. Legend has it that the process for making silk cloth was first invented by the wife of the Yellow Emperor, Leizu, around the year 2696 BC.
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Yogita Ingle 5 years, 7 months ago
It is the least reactive and most electropositive halogen, even though it can form compounds with many elements.
It is mainly found on Earth as the water-soluble iodide in brine pools and oceans. This element gives purple color when heated.
Posted by Mohammad Reyaz 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
The various food items which we eat daily are usually made up of more than one material called ingredients. The ingredients of food contain components which are needed by our body for proper functioning, called nutrients. The five major nutrients of the food are carbohydrates, proteins, fats, vitamins and minerals. In addition to these nutrients, water and roughage also form a major part of the food. All food items do not contain all major components of food. The presence of a particular component in a food item can be confirmed by performing various tests in the given sample of food.
Test for starch:
- Take a small quantity of food item to be tested.
- Add 2 to 3 drops of dilute iodine solution to the food with a dropper.
- If blue-black colour is produced, then starch is present in the given food.
Test for protein:
- Take 2 ml of the given food-stuff solution in a test tube.
- Add a little of dilute sodium hydroxide solution till the mixture clears.
- Then add 2 to 3 drops of copper sulphate solution and shake well.
- If a violet colour appears in the solution, then protein is present in the given food-stuff.
Test for fats:
- Take a small quantity of hard, solid food item and wrap it in a filter paper.
- Crush the food item carefully by using a small hammer and rub the crushed food on the paper.
- Remove the crushed food from the paper, and hold the paper towards a source a light.
- Presence of oily patches on the paper shows the presence of fats in the given food item.
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Posted by Arti Chambyal 5 years, 7 months ago
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- The food that a person eats in a day is called diet.
- Balanced diet is the diet which contains all kinds of essential nutrients in right amount needed for proper growth and maintenance of our body. Also our diet should contain roughage (raw uncooked vegetables)and water. Balanced diet depends on the age and the type of physical work we do.
- For example: an athlete would consume more amount of carbohydrate to gain more energy, an old age person would consume food which can be easily digestible.
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All living organisms require food to live. Food comprises of six important nutrients - carbohydrates, proteins, fats, vitamins, minerals and water. Nutrients are essential to perform various metabolic activities.
Posted by Mamta Gupta 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
Millets are cereal crops and small seed grasses, which are widely used in African and Asian countries. Millets are nutri - cereals , have high nutrient content, rich in dietary fibre, protein rich ,gluten free and low glycemic index grains.
There are various types of millets: Sorghum , pearl millet , finger millet , foxtail, kodo , barnyard , proso , little millet.
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A food chain describes how different organisms eat each other, starting out with a plant and ending with an animal. For example, you could write the food chain for a lion like this:
grass ---> zebra ---> lion
Posted by Setal Chaudhari 5 years, 7 months ago
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- Oxygen is used for respiration of living organisms.
- The production of steel is reliant upon oxygen where it is used in a blast furnace to turn carbon into carbon dioxide, which reduces the iron oxides to pure iron.
- Oxygen is also used at plants that treat sewage or purify water. Oxygen is pumped through water to increase the production of natural bacteria, which break down waste products.
- Oxygen as a gas is required to produce energy in industrial processes, generators and ships and it is also used in airplanes and cars.
- As a liquid, oxygen is used widely both medically and industrially, most commonly as an oxidizing agent for use in missiles and rockets where it reacts with liquid hydrogen to produce the thrust for take-off.
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A seed oil is a vegetable oil that is obtained from the seed (endosperm) of some plant, rather than the fruit (pericarp). Most vegetable oils are seed oils. Some common examples are sunflower oil, canola oil, and sesame oil. Peanut oil has a high content of monounsaturated fats and polyunsaturated fats that help lower bad cholesterol levels. It also contains natural antioxidants that protect the cells from disease-causing free radicals. It is rich in Vitamin E, which is good for the heart.
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Obesity is a medical condition in which excess body fat has accumulated to an extent that it may have a negative effect on health. People are generally considered obese when their body mass index (BMI), a measurement obtained by dividing a person's weight by the square of the person's height, is over 30 kg/m2; the range 25–30 kg/m2 is defined as overweight.
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Yogita Ingle 5 years, 7 months ago
(1) The shadow of an object is erect i.e. same side up as the object.
(2) The shadow of an object is real.
(3) Irrespective of the colour of the object the shadow is always black.
(4) The shadow can be smaller than object ,equal or bigger than object.
2Thank You