The process of depositing a thin layer of a desired metal over a metal object with the help of electric current is called electroplating.
Electroplating is done for
1) Protection from corrosion
2)Testing for decorative purpose
For example :Bathroom taps made of iron or steel are electroplated with chromium metal to prevent their corrosion or rusting. It gives a shining appearance to the bathroom taps due to which they look more attractive. The metal objects are usually electroplated with chromium, nickel, silver ,gold or copper metals.
When a metal object is electroplated with chromium, it is called chromium plating.
When a metal object is electroplated with tin, it is called tin plating.
When a metal object is electroplated with Nickel it is called Nickel plating.

Retting is the process of separation of jute fibre from jute plant. Retting is a process in which the tied bundles of jute stalks are taken to the tank by which fibres get loosened and separated from the woody stalk.  The bundles are steeped in water at least 60 cm to 100 cm depth.  The retting process is completed in 8 to 30 days, when the barks separate out easily from the stick or wood and the fibres are ready for extraction.

An object orbiting around the sun, earth or any other colossal body is known as a satellite. There are two major types of categorization when it comes down to satellites, one is natural and the other is man-made.
Some of the examples of natural satellites are planets, moons, and comets. Jupiter has 67 natural satellites. The earth has one permanent natural satellite, the moon we know, which causes the tides in the sea. Sometimes other objects (like asteroids) can enter into temporary orbits of the earth and become a natural satellite for a span. India has built and launched several artificial satellites. Aryabhatta was the first Indian satellite. Some other Indiansatellites  are  INSAT,  IRS,  Kalpana-1, EDUSAT, etc.

A thermos flask has double walls, which are evacuated and the vacuum bottle is silvered on the inside. The vacuum between the two walls prevents heat being transferred from the inside to the outside by conduction and convection. With very little air between the walls, there is almost no transfer of heat from the inner wall to the outer wall by convection. Conduction can only occur at the points where the two walls meet, at the top of the bottle and through an insulated support at the bottom. The silvered walls reflect radiated heat back to the inside, the same way a space blanket does.

Hormones are made and secreted by specialised tissue in the body called endocrine glands. A gland which do not have duct or tube and secretes its product directly into blood stream is called endocrine gland. They make a chemical substance called hormones.
For Ex: Pituitary gland, Thyroid gland, adrenal gland etc.
Some of the gland in our body function both as exocrine as well as endocrine.
For Ex: Pancreas, testes, ovaries.

Electrolysis is the process by which ionic substances are decomposed into simpler substances when an electric current is passed through them.
In the medieval times, aluminium was almost as precious as silver. Its extraction was not known and pure aluminium was extremely hard to come by. The application of electrolysis turned aluminium from a precious metal to one of the most largely used metals by humans. Aluminium is extracted from its ore by the process of electrolytic decomposition and deposition.

Sleeping Sickness or African trypanosomiasis is a parasitic disease that is caused by the parasite named Trypanosoma Brucie. It spreads through the bite of a fly called Tsetse which injects this disease into the human body. This fly has its origins from the African countries and hence the name. About 60 million people in this country are affected majorly by this disease.
The disease causes several medical disorders such as swelling of the brain which sometimes might even result in fatal conditions. In later stages, the central nervous system is also affected by the attack of ‘sleeping sickness’ resulting in death.

Following are the important applications of artificial satellites.
1. Communication: The geostationary satellites are used for communication purpose like long distance telephone calls, telex, radio and T.V broadcasts etc. The satellites used for communication purpose are called communication satellites.
2. Spying: Artificial satellites are used by military for spying of enemy troops to locate their positions and movements.
3. Weather forecasting: The satellites used for weather forecasting are called weather satellites.
4. Collection of information about other planets and outer space: The artificial satellites are used for collecting information about other planets, outer space, stars, galaxies, asteroids etc.
5. Collection of information about natural resources of earth: Artificial satellites are also used for collecting information about natural resources of earth like oil wells, underground water, minerals, natural gas and coal deposits etc.