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Ask QuestionPosted by Vishesh Gautam 4 years, 11 months ago
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Khushal. H.S Khush 4 years, 11 months ago
Posted by Rajnish Roy 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
The process of depositing a thin layer of silver electrolytically on the metal surface is called silver plating. The article to be silver-plated is used as cathode while anode consists of pure silver.
The bath contains a solution of potassium argentocyanide (AgNO3 + excess of KCN). The complex ion is very stable and ionisation is very small at a time with the result slow and uniform deposition of silver takes place.
[Ag(CN)2]2 ⇌ Ag++2CN−
Posted by Nitish Sinha 4 years, 11 months ago
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👌Aditya 👌 👌Kumar👌 4 years, 11 months ago
Rashmi Naik 4 years, 11 months ago
Yogita Ingle 4 years, 11 months ago
- These are unicellular microscopic organisms similar to animals that can move about to capture food and are heterotrophic in nature.
- They are mostly aquatic in nature.
- Amoeba, paramecium are some examples of protozoa.
Posted by Rajnish Roy 4 years, 11 months ago
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Arun Inti Inti 4 years, 11 months ago
Gaurav Seth 4 years, 11 months ago
The process of depositing a thin layer of any superior metal over an object of a cheaper metal, with the help of electric current is called electroplating.
For example; deposition of silver on brass or copper objects and that of copper, nickel, chromium etc., on objects made of iron is done by electroplating.
The experimental set up for electroplating copper on any object, such as a metallic spoon can be summarised here;
-The object to be electroplated, say iron spoon is made cathode(-ve electrode).
- A thin sheet of pure silver is made anode (+ve electrode).
-An acidified solution of silver cyanide(AgCN) is used as the electrolytic solution.
When electricity is passed through the solution, (AgCN), (Ag+) ions moves towards the anode and get reduced to silver metal. The silver metal gets electroplated on the object,i.e, metallic spoon.
The silver ions (Ag2/4+) moves towards
cathode. Here (Ag2/4+) ions do not get oxidised to Ag2+ ions. These silver ions (Ag2+) ions go into the solution. As a result of this reaction at the anode, concentration of (Ag2+) in the solution is maintained.
Posted by Aditya Jangid 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Smallpox was the first disease for which a vaccine was produced. The smallpox vaccine was invented in 1796 by English physician Edward Jenner.
Laxmi Maurya 4 years, 11 months ago
Posted by Priyanka Kumari 4 years, 11 months ago
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Posted by Shahid Haroon 4 years, 11 months ago
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👌Aditya 👌 👌Kumar👌 4 years, 11 months ago
Gaurav Seth 4 years, 11 months ago
Chemical Method: Some chemicals prevent the growth of microorganisms in food. These chemicals are used in pickles and jams to preserve them. Salt, acids and oil are also used as food preservatives. Examples: sodium benzoate and sodium metabisulphate.
Preservation by common salt: When a food item is kept in plenty of salt, water from food comes out because of osmosis. It results in dehydration of the food item. Absence of moisture helps to prevent the growth of microbes. Fish, meat and pickles are preserved by adding salt.
Preservation by Sugar: Sugar preserves food by reducing moisture in food. Jam, jelly and squash are preserved by adding sugar.
Preservation by Oil and Vinegar: The layer of oil on top of food prevents oxygen from entering the food. Some microbes do not survive in absence of oxygen. Some microbes cannot survive in acidic environment and thus vinegar is an effective food preservative.
Posted by Kriya Tated 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
Rayon can be used as substitute of silk
The man-made fibre which is regarded as artificial silk is rayon.Rayon is synthesized from wood pulp. Rayon resembles silk, so it is also known as artificial silk. Rayon can be dyed in different colours and is much cheaper than silk.
Posted by Jaya Prakash Tellu 4 years, 11 months ago
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Posted by Rachana H 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
Viruses are not exactly living i.e. the can stay dormant or inactive until they find a suitable host for them to replicate. Thus, being microscopically small isn't the only factor that is considered for an organism to come under the category of microorganisms
Posted by Divya V.M 4 years, 11 months ago
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Roshan Mishra 4 years, 11 months ago
Posted by Ramu Prathiksha 4 years, 11 months ago
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Diya Raj 4 years, 11 months ago
Posted by Akash Khanapur 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
Sowing
Sowing is the most important part of crop production. Before sowing, good quality seeds are selected. Good quality seeds are clean and healthy seeds of a good variety. Farmers prefer to use seeds which give a high yield.
Posted by Akash Khanapur 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
The various sources of irrigation are rivers, canals, wells, tubewell, dams, ponds, lakes, rain
Posted by Akash Khanapur 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
NPK stands for "nitrogen, phosphorus, and potassium," the three nutrients that compose complete fertilizers.
Posted by Akash Khanapur 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Harvesting season begins from the 3rd week of September to October
Yogita Ingle 4 years, 11 months ago
Kharif crops are typically sown at the beginning of the first monsoon rains (depends on region to region). Harvesting season begins from the 3rd week of September to October (the exact harvesting dates differ from region to region).
Posted by Akash Khanapur 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Pulses, Cereals, Oil seeds, Vegetables & fruits are different types of crop.
Different crops need different climate for growth & productivity. For example, Some crops like Maize, soya bean, sugarcane need more water whereas rice, potato need less water.
There are 2 cropping patterns based on India’s climatic conditions:
Crops grown in rainy season are termed as Kharif crops. Examples: Maize, soyabean, sugarcane
Crops grown in winter season are termed as Rabi crops. Examples: Wheat, Gram, Pea
Posted by 8B Dharsitha 4 years, 11 months ago
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Gursharan Singh 4 years, 11 months ago
Qurratulain Numani 4 years, 11 months ago
Gaurav Seth 4 years, 11 months ago
Lubricant is a substance used to reduce friction between surfaces in contact which reduces heat generated when the surfaces move.
The property of reducing friction bisetween two particles is known as lubricity. Example: oil, grease.
In case of automobiles and machine-parts which tend to get screechy or ineffective over a period of time, we apply substances to make their surfaces smooth and thereby reduce friction. These are called lubricants. You must have seen specific lubricants for automobile parts in petrol stations.
Posted by Jasleen Kaur 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
Plate tectonics is the theory that Earth’s outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core. The plates act like a hard and rigid shell compared to Earth’s mantle. This strong outer layer is called the lithosphere
Theory of plate tectonics lays down that the crust of the Earth has been formed out of seven major and some minor plates. The movement of plates beneath the surface of the Earth creates tension resulting into folding, faulting and volcanic activities.
Posted by Nethranandh Vijay 4 years, 11 months ago
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Posted by Roshan Mishra 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Organisms that are so small that they can only be seen through a microscope are called microorganisms or microbes.
The study of microorganisms is known as microbiology.
Most organisms are hardy and can be found in almost any kind of environment – hot desert, polar ice caps, salt water, marsh lands and inside other organisms.
There are five major groups of microorganism. These are as follows:
- Bacteria
- Algae
- Protozoa
- Fungi
- Viruses
Posted by Roshan Mishra 4 years, 11 months ago
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Posted by Arushi Santy 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
A man’s sound is of the lower pitch as compared to the other options. And we know that pitch is directly proportional to the frequency of sound. So, the frequency of man’s voice will be the minimum among all the options.
Posted by T Shahzeb T Shahzeb Jeelani 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
The process of separating grain from chaff and hay with the help of wind is called winnowing.
Posted by Anushka Sabat 4 years, 11 months ago
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Meghna Thapar 4 years, 11 months ago
If semen gets in the ******, the sperm cells can swim up through the cervix and uterus and into the fallopian tubes, looking for an egg. They have up to 6 days to find an egg before they die. When a sperm cell joins with an egg, it's called fertilization. Fertilization doesn't happen right away. Fertilization happens when a sperm cell successfully meets an egg cell in the fallopian tube. Once fertilization takes place, this newly fertilized cell is called a zygote. From here, the zygote will move down the fallopian tube and into the uterus.
Posted by Dev Pratap Singh Singh 4 years, 11 months ago
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Kruthika S.H. 4 years, 11 months ago
Posted by Dev Pratap Singh Singh 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Changes which occur in boys during puberty are:
- Hair grow on the face in the form of moustache and beard, and on the chest.
- Voice deepens in boys.It becomes low pitched voice.
- Testes start to make sperm.
- Testes and ***** become larger.
- Chest and shoulders of boys broaden.
- Body become muscular.
Posted by Anannya Mahato 4 years, 11 months ago
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Pradnya Kumbhar 4 years, 11 months ago
Dev Pratap Singh Singh 4 years, 11 months ago
Posted by Vandana Thakur 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
|
Direct development |
Indirect development |
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It is a type of development in which an embryo develops into a mature individual without involving a larval stage. |
1. |
It is a type of development that involves a sexually-immature larval stage, having different food requirements than adults. |
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Metamorphosis is absent. |
2. |
Metamorphosis involving development of larva to a sexually-mature adult is present. |
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It occurs in fishes, reptiles, birds, and mammals. |
3. |
It occurs in most of the invertebrates and amphibians. |
Posted by Archita Porwal 4 years, 11 months ago
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Rishi Reddy N 4 years, 11 months ago
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