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1. a.Rayon is used in textile industry for making clothing like sarees, dresses,blouses, frocks
b.it is used to make carpets
c.it is used in medical field for making bandages and surgical dressing.
2.this is because when crude oil is extracted from land it is black in colour.this resource is compared to gold due to its valuable properties and worth too... crude oil is jet black before purification. but after purification it golden in colour therefore it's tagged as gold.
3.rats living in a dessert area are known as kangaroo rats. they the following adaptations to live in dessert. they need very little water to survive in a desert area where water is slowly scarce. also they do not need food on daily basis.
4.at higher altitudes oxygen molecules are further apart because there is less pressure to push out them together. this effectively means there are fewer oxygen molecules in the same volume of air as we inhale. this is often referred as "hypoxia".
5.there are two ways of increasing friction. one is making the surfaces rough and another by increasing the mass of the object that is moving .
6. The human voice frequency is specifically a part of human sound production in which the vocal folds (vocal cords )are the primary sound source ..
7 .the passage of an electric current through the conducting liquid cases chemical reactions. the resulting effect are called chemical effect of current . the process of depositing a layer on any desired material on another material by means of electricity
8. the roots can penetrate deeper into the soil.
thus holding the plant firmly.
ploughing enhances the water retention capacity of the soil
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