Posted by Anish Roylker 14 hours ago
Diseases are caused as result of following reasons:
Posted by Deepharam Maali Deeparam 15 hours ago
Posted by Vivek Rathore 18 hours ago
Stomata are the minute openings, generally found in the epidermis of leaves. They are typically found in plant leaves and can also be found in stems and other parts of plants. Stomata play an important role by permitting the movement of gases such as oxygen, carbon dioxide, and water vapour to diffuse between the interior and outer surface of the plant tissues.
Posted by Mahi Dewangan 1 day ago
Posted by Rajesh Nirmalkar 1 day, 3 hours ago
Posted by Archena Srinivas 1 day, 12 hours ago
Few diseases caused by bacteria are:
(i) Tuberculosis (T.B.) – T.B. is an infectious disease which is communicated from one person to another directly or indirectly. It is caused by bacterium called Mycobacterium tuberculosis. T.B. can affect all parts of the body such as lungs, lymph glands, bones, intestine etc.
(ii) Cholera – Cholera is an acutely infectious, fatal disease and is more common during overcrowded fairs, festivals and after floods. Cholera is caused by the bacterium Vibrio Cholerae. It is transmitted by flies, contaminated water and food.
(iii) Typhoid – Typhoid is most common communicable disease in India. Typhoid fever is common in humans of the age 1to 15 years age group. Typhoid is caused by a rod-shaped and motile bacterium, called Salmonella typhi which is commonly found in the intestine of human beings. Human infection is direct.
(iv) Diarrhoea – Diarrhoea is an abnormally frequent discharge of semisolid or fluid faeces. The diarrhoea spreads through infection by contaminated food, water, drinks, hands, clothes, etc. The causative agents of diarrhoea are mainly bacteria such as Escherichia coli, Clostridium botulinum, Shigella dysentiriae, Campylobacter jejuri and Salmonella.
Posted by Rajat Soni 1 day, 13 hours ago
An element can be defined as a basic form of matter which cannot be broken down into simpler substances by any physical or chemical means. A compound is a pure substance composed of two or more elements combined chemically in a fixed proportion by mass.
Posted by Jammu Kids By Aaditya Bakshi 1 day, 14 hours ago
There are 16 essential elements, out of which carbon and oxygen are obtained from air, hydrogen from water and remaining 13 elements are supplied by soil. These essential elements are divided into two categories: macronutrients and micronutrients. Amongst the thirteen nutrients, six are required in large quantities and are therefore called macro-nutrients. The other seven nutrients are used by plants in small quantities and are therefore called micro-nutrients.
Posted by Zimmy Stephan Bagh 1 day, 15 hours ago
Niels Bohr, revised Rutherford’s atomic model and put forth the following suggestions:
Neils Bohr proposed that the electrons possess a specific amount of energy which allows them to revolve around the nucleus. The electrons are confined to these energy levels. While revolving in these discrete orbits, the electrons do not radiate energy. Hence, these orbits are also known as stationary orbits or stationary shells. Smaller the size of the orbit, smaller is its energy.
As we move away from nucleus, the energy of the orbit increases progressively. The transfer of an electron from one orbit to another is always accompanied with absorption or emission of energy. When an electron jumps from a lower energy level to a higher energy level, it absorbs energy. When an electron returns from a higher energy level to a lower energy level, it emits energy.
Posted by Ajanta Chakrabarti 1 day, 16 hours ago
Posted by Ankit Jaat 1 day, 16 hours ago
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