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Most of the ores are in forms of oxides and sulfide they are generally extracted by reduction with carbon.But the metals which are more reactive than carbon cannot be obtained by this process. Generally electrolysis is carry out to extract the most reactive metals from their ores.example = Aluminium and Sodium.

William Gilbert also known as Gilberd, was an English physician, physicist and natural philosopher.He is credited as one of the originators of the term “electricity”.

Hertz (Hz) is the unit of frequency.
Frequency is the number of oscillations in a second.
So the meaning of one hertz is one oscillation or one cycle per second.

A system with no inputs is called a closed system . One with inputs is an open system. Since human being needs energy, water, minerals, etc. (as inputs), human body is an open system.solated system, neither matter nor energy transfer between a system and its surroundings are allowed.

The reason is that with the door open the temperature will start to rise inside the refrigerator. The thermostat will kick in and try to cool it back down. This means the motor is running, which means heat is being added to the room.

Pulmonary artery – Only artery carrying deoxygenated blood

Pulmonary veins – Only vein carry oxygenated blood

Goitre – a swelling of the neck resulting from enlargement of the thyroid gland.Worldwide, over 90% of goitre cases are caused by iodine deficiency.A goitre, associated with hypothyroidism or hyperthyroidism.
Deficiency of Iron- Anemia.
Deficiency of Potassium- Hypoglycemia.
Deficiency of Cdamium- Itai-itai.

Vitamin C is water soluble. All others fat soluble.
Vitamins are classified as either fat soluble (vitamins A, D, E and K) or water soluble (vitamins B and C). This difference between the two groups is very important. It determines how each vitamin acts within the body. The fat soluble vitamins are soluble in lipids (fats).

Indian sandalwood – Santalum album

Golden shower tree/Indian laburnum – Cassia fistula

Teak – Tectona grandis

Neem Tree – Azadirachta indica

Rhinoceroses are large, herbivorous mammals identified by their characteristic horned snouts. The word “rhinoceros” comes from the Greek “rhino” (nose) and “ceros” (horn).

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