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Yogita Ingle 7 years, 10 months ago
Hormones: A special chemical messengers of the body that are produced by the endocrine glands. These special messengers control most of the body functions right from primary needs like hunger to complex system and function like reproduction and emotions.
Important activities of hormones include:
(i) Growth and development of promoting cell and tissue.
(ii) Food metabolism.
(iii) Initiating and maintaining sexual development and reproduction.
(iv) Maintaining body temperature.
(v) Controlling thirst and hunger.
(vi) Regulating mood and cognitive functioning.
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Yogita Ingle 7 years, 10 months ago
Colour (color) blindness (colour vision deficiency, or CVD) affects approximately 1 in 12 men (8%) and 1 in 200 women in the world. In Britain this means that there are approximately 2.7 million colour blind people (about 4.5% of the entire population), most of whom are male.
There are different causes of colour blindness. For the vast majority of people with deficient colour vision the condition is genetic and has been inherited from their mother, although some people become colour blind as a result of other diseases such as diabetes and multiple sclerosis or they acquire the condition over time due to the aging process, medication etc.
Most colour blind people are able to see things as clearly as other people but they are unable to fully ‘see’ red, green or blue light. There are different types of colour blindness and there are extremely rare cases where people are unable to see any colour at all.
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Yogita Ingle 7 years, 10 months ago
Green leaves contain moisture whereas dry leaves do not contain moisture as a result, the ignition temperature of green leaves is higher than that of dry leaves. Due to this reason, it is difficult to burn a heap of green leaves but dry leaves catch fire easily.
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Yogita Ingle 7 years, 10 months ago
When oil or grease is applied between the moving parts of a machine ,a thin layer of oil or grease is formed between the two rubbing surfaces. This layer of oil separates the two rubbing surfaces a little bit due to which their interlocking is reduced to a large extent. This friction is reduced and movement becomes smooth. When oil or grease is applied to the moving parts of a machine, then their surfaces do not rub directly against each other, they rub through a layer of oil and grease .
The substance which reduce friction are called lubricants. Oil ,grease ,graphite and fine powder are lubricants. The applying of lubricants to a machine is called lubrication.
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