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Ask QuestionPosted by Aditya Koshale 7 years, 2 months ago
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Posted by Ramees Mujeeb 7 years, 2 months ago
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Meghna Thapar 5 years, 7 months ago
Antibiotics are produced industrially by a process of fermentation, where the source microorganism is grown in large containers (100,000 – 150,000 liters or more) containing a liquid growth medium. Once the process is complete, the antibiotic must be extracted and purified to a crystalline product. Antibiotics destroy 'good bacteria' and worsen oral infection. Summary: Researchers found that antibiotics actually kill the 'good' bacteria keeping infection and inflammation at bay. New research shows that the body's own microbes are effective in maintaining immune cells and killing certain oral infections.
Posted by Ayush Rai 7 years, 2 months ago
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Posted by Harsh Toshniwal 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
Mitochondria are the powerhouse of the cell because they supply power (energy) to all the cell of the body.
All living cells have mitochondria (cell organelle), are responsible for producing energy (called ATP) that the cell needs to function.
They are like power stations in our bodies, supplying energy to all cells for proper functioning.
If our cells do not have energy, then the tissues or body organs that are made up of cells do not work properly, in the same way that if power stations do not produce enough energy for the country there will be areas of blackout, where parts of the country cannot function.
Posted by Harshida Chachan 7 years, 2 months ago
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Posted by Harshida Chachan 7 years, 2 months ago
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Yogita Ingle 7 years, 1 month ago
Nitrogen is used to make ammonia. Medical samples containing, for example blood, viruses for vaccinations and semen, can be stored for long periods if kept cool in liquid nitrogen.
All of the major uses for argon are related to the production, processing and fabrication of metals.
Liquid helium, with its very low boiling point of 4 K, has become very important in cooling superconductor magnets, used, for example, in MRI scanners for medical diagnosis.
Posted by Samridhi Yadav 7 years, 2 months ago
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Daljit Singh 7 years, 2 months ago
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Posted by Mohit Kumar 7 years, 2 months ago
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Yogita Ingle 7 years, 1 month ago
Metals: Metals are lustrous, sonorous, ductile, and are good conductor of heat and electricity. Most of the metals are available as solid at room temperature; except mercury. Sodium and potassium are so soft that they can be cut with knife.
Non-metals: Non-metals are no-lustrous, non-sonorous, non-ductile, and are bad conductor of heat and electricity. Non-metals are available in all the three states of matter.
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Abdul Shakoor 7 years, 2 months ago
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Posted by Samridhi Yadav 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
Uses of Metals:
- Metals are used for making machines and tools.
- Iron is used for making ships, bridges, railway lines, etc.
- Copper is used for making electric wires.
- Aluminium is used for making utensils.
- Gold and silver are used for making ornaments.
Uses of Non-metals:
- Oxygen is used by all living beings for respiration.
- Carbon dioxide is used by plants for photosynthesis.
- Chlorine is used for water purification.
- Iodine solution is used as antiseptic and applied on wounds.
- Coal (carbon) is an important fuel.
Posted by Samridhi Yadav 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
Chemical properties of metals:
1. Reaction of metal with oxygen: Metals react with oxygen to form metal oxides. Metals donate electrons to oxygen for the formation of metal oxides. For example:
4K + O2 <nobr>→</nobr> 2 K2O
Metal oxides are generally basic in nature but it can also be amphoteric in nature. Amphoteric oxides mean that they are acidic as well as basic in nature. Some of the metals like sodium and potassium react vigorously with oxygen. Whenever sodium or potassium is exposed to air it catches fire. Hence, they are kept in kerosene.
2.Reaction of metal with water: Some of the metals react with water to form metal hydroxide whereas some of them do not react. Reactivity with water differs from metal to metal.
Chemical properties of non metals:
1. Reaction of non metal with oxygen: Non-metals reacts with oxygen to produce non-metallic oxides that are acidic in nature because when dissolved in water non-metallic oxides gives off non-metallic acids. Sulphur reacts with oxygen producing sulphur dioxide which on further reaction with water gives sulphurous acid.
S + O2 → SO2
2.Reaction of non metal with water: Non-metals do not react with water but are very reactive in air due to which they are stored in water. Phosphorous is a vigorously reacting non-metal that catches fire if exposed to air. To avoid such reaction phosphorous is stored in water that cuts off its contact with atmospheric oxygen.
Posted by Ishita Sarkar 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
Take a plastic container and make four holes in it at different heights. Fill the container with water, and let water keep flowing into it from a tap. Notice the force with which water comes out of the holes.
You will find that water comes out with greater force from the holes at greater depth. Water from the bottom-most hole will be spurted out the farthest from the container. This shows that the pressure in a liquid increases with increasing depth.
Now take another plastic container and make holes all around it at the same depth, by measuring from the top of the container. You will notice that water comes out from all the holes with the same force. This shows that at the same depth, the pressure is the same in all direction.
Posted by Samridhi Yadav 7 years, 2 months ago
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Surya Pratap Singh 7 years, 2 months ago
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Yogita Ingle 7 years, 1 month ago
- Natural gas is useful for cooking foods.
- It is also useful to run central heating and cooling systems and cloth dryers.
- It is useful in the manufacture of fabrics, glass, steel, plastics, paint and other products.
- It is the major sources of electricity generation through the use of gas turbines and steam turbines.
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Asha Gopalakrishnan 7 years, 2 months ago
Quzzel ?? Marina 7 years, 2 months ago
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Meghna Thapar 5 years, 7 months ago
The zones of weakness in the earth's crust due to the abrupt release of strain and it is called the Seismic zones. In the earth surface we can see various cracks found and those are called faults. The zone of weakness concept implies that there exist within the earth's crust relatively weak zones which when differentially stressed will fail more readily than will the surrounding rock. Such zones are often inferred to determine the extent, orientation and style of younger deformation.
Posted by Madhu Bhardwaj 7 years, 2 months ago
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Meghna Thapar 5 years, 7 months ago
The major glands of the endocrine system include the pineal gland, pituitary gland, pancreas, ovaries, testes, thyroid gland, parathyroid gland, hypothalamus and adrenal glands. The endocrine system is the collection of glands that produce hormones that regulate metabolism, growth and development, tissue function, sexual function, reproduction, sleep, and mood, among other things.
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Yogita Ingle 7 years, 2 months ago
Acetic acid is an organic acid with the formula CH3-COOH. Its functional group is carboxylic acid group. Acetic acid is a monocarboxylic acid because it contains only one "COOH"group. It has a sour taste and pungent smell. It is the main component of vinegar. Vinegar is typically 3-7% solution of acetic acid in water. Vinegar is mainly used as a preservative in food and in the pickling of vegetables. Water free acetic acid is known as glacial acetic acid.
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