(i) It is present only in troposphere. (ii) It is present in very small quantities in stratosphere. (iii)It can be beneficial or harmful, depending upon its location and concentration. (iv) It shields the surface of the earth from ultraviolet (UV) ...
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Sodium and potassium react violently with the release of huge amount of heat. So the reaction is highly exothermic. Hydrogen gas which is produced during the reaction catches fire. Calcium reacts less violently with water. The heat evolved is not ...
Metals react with water to produce metal oxide and hydrogen gas. Metal oxides that are soluble in water, dissolve in water to form metal hydroxide.
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i. It is 8-nucleate and 7-celled at maturity ii. It is free-nuclear during the development iii. It is situated inside the integument but outside the nucellus iv. It has an egg apparatus situated at the chalazal end
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