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Ask QuestionPosted by Nikhil Bansal 5 years, 11 months ago
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Himanshu Gupta 5 years, 10 months ago
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Yogita Ingle 5 years, 11 months ago
Aluminum is more reactive than iron but it doesn't corrode It is because of aluminium oxide layer. Aluminium outer surface layer is oxidized whenever it came in contact with the air and so result in aluminium oxide layer which is resistive in nature and remain attached to it. So due to this it act as protective layer to inner aluminium to get oxidized with air while in iron as the surface layer of iron is oxidized, it form rust which is not remain attached to iron and fall off exposing the inner iron for further oxidation.
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Shankarchoudhary Lal 5 years, 10 months ago
Yogita Ingle 5 years, 11 months ago
In the 17th and 18th century, the urban crafts were more flourished and powerful compared to traditional crafts.
a. They were asked to produce products for the international market. But their products were not able to compete with urban crafts and guilds.b. Urban guilds were granted a monopoly right to produce and trade in specific products.Hence they moved to the countryside and began to work for merchants.
Posted by Sourabh Dhakad 5 years, 11 months ago
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Himanshu Gupta 5 years, 10 months ago
Yogita Ingle 5 years, 11 months ago
1. Plaster of Paris is calcium sulphate hemihydrate
2.It is called plaster of Paris because it is obtained from gypsum and is found in Paris
3. It is obtained by heating gypsum
4. It is used for plastering fractured bones.
5. It is used in making toys.
6. It is used in making casts for statue toys etc.
7. It is used for making blackboard chalks.
8. It is used in dentistry.
9. It is used in laboratories.
10. It is a white powder.
Ashish Moharana 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
AIM: To demonstrate hydrotropism in plants.
PROCEDURE :
- Plant a seedling in a vessel containing soil.
- Adjacent to the seedling put a porous pot containing water.
- Leave the set up for few days.
OBSERVATION :
- On examining the roots of seedlings it is observed that the roots bend towards the source of water and do not grow straight.
RESULT :
It confirms that plant shows hydrotropism as the roots bend towards the porous pot of water. As hydrotropism is a plant growth response in which the direction of growth is determined by a stimulus of gradient in water concentration.
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Yogita Ingle 5 years, 11 months ago
Balkan region was a source of tension because of the following reasons:
(1) It was a region of geographical, ethnic variation comprising Romania, Bulgaria, etc:and its inhabitants were broadly known as Slavs.
(2) Large part of Balkans was under the Ottoman Empire and the disintegration of which created an explosive situation. One by one its European subject nationalities broke away from its control and declared independence.
(3) Balkan peoples based their claims for independence or political rights on nationality and used history to prove that they were independent but subsequently subjugated.
(4) The Balkan states were fiercely jealous of each other & hoped to gain territory.
(5) Matters complicated because of intense rivalry among European powers over Trade & colonies as well as naval and military might. This led to a series of wars in the region and finally the first world war.
(6) Spread of the ideas of romantic nationalism.
Posted by Yuvraj Arya 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
(1) In 1815, most of the revolutionaries wanted the creation of nation-states as a necessary part of the struggle for freedom. Giuseppe Mazzini was one of them.
(2) As a young man of 24, he was sent into exile in 1831 for attempting a revolution in Liguria. Then he founded two undergound societies to help him unite the country.
(3) Mazzini believed that God had intended nations to be the natural units of mankind. So, Italy could not be the patchwork of small states and kingdoms.
(4) It had to be forged into a single unified republic within a wider alliance of nations.
(5) This unification could become the basis of Italian liberty and the possibility of economic development and political dominance.
Posted by Vigyan Swarup 5 years, 11 months ago
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Yogita Ingle 5 years, 10 months ago
Indiscriminate use of resources by human beings has led to economic, social and ecological problems. The major problems that have arisen due to over-exploitation, irrational consumption and indiscriminate use of resources are :
(i) Depletion of resources for satisfying the greed of a few selfish individuals.
(ii) Accumulation of resources in a few hands, which in turn, has led to social segregation into rich and poor. The society is divided into two segments, i.e., have and have-nots.
(iii) Indiscriminate and uncontrolled exploitation of resources without consideration for the future have led to grave ecological problems like global warming, ozone layer depletion,environmental pollution and land degradation.
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