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Yogita Ingle 5 years, 8 months ago
Water vapor: We know that water present in oceans and rivers evaporates during summer and escapes into the air. Thus water vapor is one of the components of the air. It occupies very less percentage of earth’s atmosphere.
Oxygen: Have you ever tried to burn a candle in absence of air? If you would try you would notice that it doesn’t burn in absence of air. Air contains some matter which supports combustion. This substance is oxygen. Oxygen is one of the major components of air around us. Air comprises almost 21% oxygen.
Nitrogen: When you blow over a burning candle you notice that it extinguishes. This means air contains incombustible gases (gases which don’t support combustion) too. This is majorly due to the presence of nitrogen. Nitrogen occupies nearly 78% of earth’s atmosphere and is the most abundant gas on our planet.
Carbon dioxide: Carbon dioxide is mainly produced due to respiration by plants and animals or burning of fuel. It occupies 0.038% of the earth’s atmosphere. Its occupancy keeps on changing from one place to another in our atmosphere.
Smoke and dust particles: Smoke is present in our atmosphere due to the burning of fuels. Its occupancy varies from place to place. It is a mixture of gases and is often harmful. Apart from these, dust particles are also present in our atmosphere which we observe when we see a ray of light in a dark room. Smoke and dust particles occupy less than 1% of earth’s atmosphere.
Posted by Harvinder Kaur 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Carbohydrates, proteins, fats, vitamins and minerals are essential components of food, these components are called nutrients.
Posted by Hardik Singh 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
- It is used in medicine – Saline solution in nasal spray
- It is used in fire extinguishers
- It is used in cleansers like shampoo, toothpaste
- It is used in the soda ash industry to produce sodium carbonate through Solvay process
- It is used in the paper industry, textile industry and in the construction of roads
- It is used in water softening
Posted by Hardik Singh 5 years, 8 months ago
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Aradhya Seth 5 years, 8 months ago
Yogita Ingle 5 years, 8 months ago
Photosynthesis
- The process by which plants make their own food in the presence of sunlight, carbon-dioxide present in air, water, minerals and chlorophyll present in leaves is termed as photosynthesis
- Plants take up carbon-dioxide from the atmosphere through the tiny pores known as stomata present on thesurface of the leaves and surrounded by ‘guard cells’.
- The process of photosynthesis releases oxygen in the atmosphere during the synthesis of food.
Posted by Anil Singh 5 years, 8 months ago
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Posted by Anil Singh 5 years, 8 months ago
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Posted by Anil Singh 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Liver:
- It is a reddish brown gland situated on the right side in the upper part of the abdomen.
- It is the largest gland of our body.
Functions of liver:
- It secretes bile juice which play an important role in digestion of fats.
Posted by Anil Singh 5 years, 8 months ago
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Posted by Minar Khismatrao 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Parasites can be classified based on their size, characteristics, and relationship with the host:
- Endoparasites: A parasites living inside the host’s body. For example-Plasmodium falciparum, a parasite which causes malaria in humans.
- Ectoparasites: A parasites living outside the host’s body. For example- Bedbug, a parasite which causes skin irritation.
- Mesoparasites: These enter the opening of the body of a host and embed themselves only partially.
Posted by Anil Singh 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Molars: There are two molars on both sides in both the jaws. They have almost a flat surface with small projections. These teeth are meant for fine grinding of food.
Posted by Anika Kanade 5 years, 8 months ago
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Meghna Thapar 5 years, 8 months ago
A bacterium in our mouths called Streptococcus mutans converts sugar to lactic acid, which eats tooth enamel. Acidic drinks eat away at your tooth enamel, the outer layer of your teeth. This erosion puts your smile at risk of cavities. As the enamel erodes, you may experience tooth sensitivity, be prone to cavities and even experience some discoloration.
Posted by Ãñkïtã Rãj 5 years, 8 months ago
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Anika Kanade 5 years, 8 months ago
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Green plants make their food themselves. Green leaves make food from Carbon dioxide and water in the presence of sunlight and chlorophyll.
Leaves have several tiny pore-like structures on the lower surface. Such a pore is called stomata through which leaves absorb carbon dioxide from air. Water is transported to the leaves through hair like pipelines from the roots. These pipelines are present throughout the plant, i.e. from roots to branches and leaves. These pipe-lines are known as Xylem. Xylem is a type of tissue. Chlorophyll, a green pigment, is found in green leaves. Chlorophyll absorbs sunlight and gives energy. Chloroplast is the site of photosynthesis. Carbohydrate is used as food and oxygen is emitted out to atmosphere. This whole process of making food by plants is called photosynthesis.
Posted by Aryan Rajput 5 years, 8 months ago
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Posted by Tanuja Behera 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Tooth decay:
- Improper cleaning of teeth leads to growth of harmful bacteria which produce acids from the left over food present in our mouth, which damages our teeth leading to tooth decay.
- We can avoid it by
Posted by Shriya Dora 5 years, 8 months ago
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Posted by Tanuja Behera 5 years, 8 months ago
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Meghna Thapar 5 years, 8 months ago
Tooth decay is the softening of your tooth enamel and refers to the damage of the structure of the tooth caused by acids that are created when plaque bacteria break down sugar in your mouth. If this loss of mineral from the enamel is left untreated, a cavity, or hole in the tooth, can eventually occur. Without treatment, these holes can grow larger over time and may even destroy the whole tooth. While most people don’t like to think about it, bacteria naturally live in your mouth. When these bacteria digest the carbohydrates that linger on your teeth and in your mouth, acid forms.
Posted by Tanuja Behera 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Assimilation is the movement of digested food molecules into the cells of the body and their utilization. For example, glucose is used in respiration to provide energy. Amino acids are used to build new proteins.
Posted by Tanuja Behera 5 years, 8 months ago
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Posted by Parminder Kaur Masaun 5 years, 8 months ago
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Yogita Ingle 5 years, 8 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 Parminder Kaur Masaun 5 years, 8 months ago
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Yogita Ingle 5 years, 8 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 Ashwani Yadav 5 years, 8 months ago
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Posted by Tanuja Behera 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Glucose is a simple sugar. Glucose can easily dissolve in our blood and hence when glucose is taken it does not need to be digested and thus gets absorbed quickly.
Posted by Mayank Sharma 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Hacking is identifying weakness in computer systems or networks to exploit its weaknesses to gain access. Example of Hacking: Using password cracking algorithm to gain access to a system
Posted by Mahek Dev 5 years, 8 months ago
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Anika Kanade 5 years, 8 months ago
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Presence of starch in leaves can be tested by iodine test. Iodine turns starch solution into blue-black colour. Pour few drops of dilute iodine solution on the boiled leaf. The leaf becomes blue-black which proves the presence of starch in it. The starch is a carbohydrate.
Posted by Subhash Chand 5 years, 8 months ago
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Bhawna Shukla 5 years, 8 months ago
3Thank You