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Meghna Thapar 5 years, 7 months ago
Several microorganisms cause diseases in plants. Some of the common diseases are
- Rust of wheat – It is caused by fungi. It is transmitted through air and seeds. It occurs in wheat plants.
- Citrus canker – It is caused by bacteria. It is transmitted through air. It occurs in citrus trees such as lemon, orange, etc.
- Yellow vein mosaic of bhindi – It is a viral disease and is transmitted through insects.
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Foram Mandali 5 years, 7 months ago
Yogita Ingle 5 years, 8 months ago
Weeding is the process of controlling the growth of weeds. There are various methods of weeding:
- Spraying weedicides on the weeds
- Manually plucking the weeds by hands
- Removing weeds by trowel and harrow
- Ploughing the field to remove the weeds even before sowing the seeds
Posted by Jasmeet Kour 5 years, 8 months ago
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Meghna Thapar 5 years, 7 months ago
The process of loosening and turning the soil is called ploughing (tilling). It is done by using an implement called plough. Ploughs are made of wood or iron having an iron tip for easy penetration into the soil. The ploughs are pulled by a pair of bullocks or by a tractor.
Advantages of ploughing:
- The loose soil allows the plant roots to penetrate freely and deeper into the soil so that plants are held more firmly to the ground.
- The loose soil allows the roots of the plants to breathe easily.
- The loose soil helps in the growth of worms and microbes present in the soil as they help in turning and loosening of soil.
- Ploughing also uproots and buries the weeds standing in the field and thereby suffocates them to death.
- The loosening and turning of soil during ploughing brings the nutrient rich soil to the top so that the plants can use these nutrients.
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Heena Singh 5 years, 8 months ago
Yogita Ingle 5 years, 8 months ago
Deforestation can be defined as the large-scale removal of trees from forests (or other lands) for the facilitation of human activities. It is a serious environmental concern since it can result in the loss of biodiversity, damage to natural habitats, disturbances in the water cycle, and soil erosion. Deforestation is also a contributor to climate change and global warming.
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Heena Singh 5 years, 8 months ago
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Meghna Thapar 5 years, 5 months ago
At the time of Indian independence in 1947, India was divided into two sets of territories, one under direct British rule, and the other under the suzerainty of the British Crown, with control over their internal affairs remaining in the hands of their hereditary rulers. When using diplomacy, advantages may be one or more of the following: Results are reached by all involved and thus tend to be more durable. Results arrived at by diplomacy are more agreeable to all involved, certainly when compared to warfare. Results tend to be cheaper than its alternatives.
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Yogita Ingle 5 years, 8 months ago
Medieval Period was totally different from the modern period of history as is medieval time, there were kingdoms, delhi sultanates like tughlaq,lodhi and khilji.....But in modern history our freedom strugglers fought for their freedom against the British rule.....So, there is the large boundary between them.
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Heena Singh 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Convex polygon:
If each of the interior angles of a polygon is less than 180°, then it is called convex polygon.
Concave polygon:
If at least one angle of a polygon is more than 180°, then it is called a concave polygon.
Posted by Mamta Sharma 5 years, 8 months ago
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Meghna Thapar 5 years, 7 months 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.
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.
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Rajibul Haque 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
After their independence for a democratic nation, Nepal's first constitution reflected in the monarchy of Nepal. But Nepal's citizens had fought for the democracy of Nepal and thus had come together to form the new constitution of Nepal, overlooking the fact of a democratic nation.
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