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Posted by Anshu Kumar 6 years, 4 months ago
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Sia ? 6 years, 4 months ago
Platinum, gold and silver are placed at the bottom of the activity series and are very little reactive in nature known as noble metals. They are not even affected by air, water and even by chemicals. Since they have bright lusture, we can use them for making jewellery.
Dharmendra Kushwaha 6 years, 4 months ago
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Gold ,silver & diamonds are used in jeweler because Metals like gold, silver, platinum etc. Have lustre ,and these are less reactive, these metals cannot react with air water and acids and these metals are malleable and ductile. Due to these properties these metals are called noble metals and they are used in jewelers.Diamond is an allotrope of carbon. It is very hard and have high refractive index. Hence it is used in jewelers.
Posted by Harshita Gupta 6 years, 4 months ago
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Posted by Syed Daniel 6 years, 4 months ago
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Yogita Ingle 6 years, 4 months ago
1) A force can move a stationary object
Ex-The force of engine makes a stationery car to move.
2) A force can stop a moving object.
Ex-The force of brakes can stop a moving car.
3) A force can change the speed of a moving object.
Ex-When a hockey player hits a moving ball, the speed of ball increases.
4) A force can change the direction of a moving object.
Ex-In a cricket match, when a moving cricket ball is hit by a bat ,then the direction cricket ball changes.
Dharmendra Kushwaha 6 years, 4 months ago
Posted by Pramod Thorat 6 years, 4 months ago
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Migration refers to the movement of an organism or a group of organisms from its natural habitat to another place at a particular time every year. Organisms migrate from one place to another to avoid inhabitable climatic conditions or for breeding
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Wild life sanctuaries: The natural area where wildlife is protected and preserved is called wildlife sanctuary. These places provide suitable living conditions to the wild life. Killing, poaching, or capturing of wildlife animals is strictly prohibited in the wildlife sanctuaries. These places mainly consist of landscapes, mountains forests and broad leaf forests with limited human activities being permitted in the sanctuary.
Example: Pachmarhi wildlife sanctuary (M.P), Kaziranga National Park (Assam), Gir National Park and Sanctuary (Gujarat).
Biosphere reserves: Biosphere is that part of the earth in which the living organisms live or that part of the earth which supports life. Biosphere reserve areas are meant for conservation of biodiversity of a specific area. The entire flora and fauna in these regions is preserved in its natural habitat. It also helps in the maintenance of biodiversity culture. These regions permit limited economic activities in them (sand and stone mining) and help to promote research in ecological conservation and environment preservation.
Example: Pachmarhi Biosphere reserve (M.P), Sunderbans Biosphere reserve (West Bengal), Gulf of Mannar Biosphere Reserve (Tamil Nadu)
Posted by Mallikarjuna H Priyanka 6 years, 4 months ago
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Harshita Mishra 6 years, 4 months ago
Posted by Suhani Singh 6 years, 4 months ago
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- Lung disease
- Problems with memory, attention and decision-making, which make daily living more difficult
- Global effects of drugs on the body, such as breast development in men and increases in body temperature, which can lead to other health problems
- A weakened immune system, increasing the risk of illness and infection
- Nausea and abdominal pain, which can also lead to changes in appetite and weight loss
- Increased strain on the liver, which puts the person at risk of significant liver damage or liver failure
- Seizures, stroke, mental confusion and brain damage
- Heart conditions ranging from abnormal heart rates to heart attacks and collapsed veins and blood vessel infections from injected drugs
Posted by Aditya Nikam 6 years, 4 months ago
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Cell wall is non-living and freely permeable rigid structure bounding the plant cell. It is secreted by the cell itself for the protection of its plasma membrane and cytoplasm.
Posted by S Kuldeep 6 years, 4 months ago
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Meghna Thapar 5 years, 10 months ago
A fabric means cloth which is made by weaving or knitting long, twisted threads called yarn made from fibres. Fibres can be divided into two groups – natural fibres and synthetic fibres. Natural fibres are fibres obtained from plants and animals. Example – cotton, flax and jute comes from plants whereas wool and silk are obtained from animals. The synthetic fibres are the fibres made by human beings. Example – rayon, nylon, polyester and acrylic.
Posted by Siddhant Mishra Km 6 years, 4 months ago
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The first step before growing a crop plant is the preparation of soil for sowing of seeds, the soil has to be loosened so that the roots of plants may penetrate deep into the soil, the loosening of soil allow the roots to breathe easily because loosened soil promotes growth of organisms like earthworms and microbes which are the farmer friends as they further turns and loosen the soil and add humus to it, apart from this turning and loosening of soil brings the nutrient rich soil to the top and the top layer of soil supports plant growth, thus nutrient rich soil at the top layer helps in good and healthy crop and hence turning and loosening of soil is very important for cultivation of crops. The process of loosening and turning of the soil is called tilling or ploughing and is carried on by using a plough.
Suhani Singh 6 years, 4 months ago
Posted by Soni Pal 6 years, 4 months ago
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Disease caused by the viruses:
- Chicken Pox: It is caused by the Varicella zoster virus (VZV).
- Flu (Influenza): Common cold is the most common form of influenza.
Disease caused by theInsects:
- Cholera,Tuberculosis,Typhoid,Diarrhoea.
Posted by Deva Dharshini 6 years, 4 months ago
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Wavelengths of red and blue lights are 7000 A° and 4000 A°, respectively.
Fine dust particles in air and air molecules scatter blue light more effectively than red light. Blue light gets scattered all around the sky. Whichever direction we look some of the scattered blue light reaches us.
Since we see the blue light from every where overhead. The sky looks blue.
As we look closer to the horizon, the sky appears much paler in colour. To reach our eye, the scattered blue light must pass longer distance through the air.
Blue light gets scattered further more. Less blue light manages to reach our eyes. The colour of the sky near the horizon appears paler or white.
Posted by Shivam Kumar Singh 6 years, 4 months ago
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Posted by Rounak Panghal 6 years, 4 months ago
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Yogita Ingle 6 years, 4 months ago
It is the friction when one body rolls over the surface of another body. This force slows down the motion of a rolling object. This opposing force comes into play when one body actually rolls over the surface of another body. For example, roller skates have wheels that help in moving very fast.
Shahid Zehan 6 years, 4 months ago
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Posted by Kripa Shankar Pandey 6 years, 4 months ago
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Sia ? 6 years, 4 months ago
Sulphur has the properties of poor conductor of both heat and electricity.
?Sheetal Sahu? 6 years, 4 months ago
Dharmendra Kushwaha 6 years, 4 months ago
Yogita Ingle 6 years, 4 months ago
Sulphur is a non metal.
It has the properties of poor conductor of both heat and electricity
It is weak,dull and can be easily breakable.
So it is bad conductor.
Posted by Prerna Nair 6 years, 4 months ago
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| Meaning | The part of nitrogen cycle where ammonium (NH4+) is converted into nitrate (NO3-) is called nitrification. | Denitrification is the level where reduction of nitrate (NO3-) is made into nitrogen gas (N2). |
| The process involves | Nitrifying bacteria like Nitrobacter, Nitrosomonas. | Denitrifying bacteria like Spirillum, Lactobacillus, Pseudomonas, Thiobacillus. |
| Grows slowly. | Grows rapidly. | |
| Requires aerobic condition. | Requires anaerobic condition. | |
| The microbes | Autotrophic. | Heterotrophic. |
| Precursor | Ammonium . | Nitrate. |
| End product | Nitrate. | Nitrogen. |
| pH and Temperature | The process occurs at the pH between 6.5 to 8.5 and temperature between 16 to 35 degree C. | The process occurs at the pH between 7.0 to 8.5 and temperature between 26 to 38 degree C. |
| Importance | Provides nitrate to the plant, which acts as the important nitrogen source. | Denitrification is used in wastewater treatment and is beneficial for aquatic habitats. |
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Mohit Dudi 6 years, 4 months ago
1Thank You