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They decrease the rate of photosynthesis. Examples: Ozone, hydrogen fluoride, nitrogen oxide, sulphur dioxide, dust particles, smoke reduce light intensity and photosynthes..

Dry Air - We know that there is water vapour in air. In other words, air contains moisture and so it is wet. This quality of wetness is referred to as humidity. For our physical comfort, humidity should not be too high or too low. Usually when the atmospheric temperatu..

can be Pollution due to use of aerosols due to high density of population due to waste disposal system Out of them, major contribution of air pollutants is from industrial pollution and transport related pollution - because industrial activity and transport are continuously op..

>The capacity of air to retain water vapour increases with increase in temperature. A rise in temperature causes the rate of evaporation to increase. Thus, many coastal areas have a higher percentage of humidity in summer than in winter. The mass of water vapour present in a lit..

The total number of birds migrated from the far south of South America to northern wintering grounds in 4 hours is 1200. Find the total number of birds migrated in 9 hours, if the rate of migration remains the same. => 2700 or 2121 or 2221 or 2200..

A cannon ball was fired, which raised into air at a constant rate of 47 ft/sec. Find the velocity and speed of the cannon ball. => 47 ft/sec, 47 ft/sec or - 47 ft/sec, 47 ft/sec or 1 47 ft/sec, 47 ft/sec or 47 ft/sec, 1 47 ft/sec..

The catalysts used in this process are platinum or vanadium pentoxide (V 2 O 5 ) that are heated to a high temperature. The optimum temperature required is 450 - 500 o C. Remember:- Low temperature favours the oxidation of sulphur dioxide. If the temperature is too low, the rate o..

Concentration of Reactants - In most cases, the rate of a reaction is accelerated with increase in concentration of a reactant. A piece of wood burns faster in oxygen than in air..

The Chaparral Biome - Also referred as 'Mediterranean scrub forest' extends along mediterranean, pacific coast of North America, South Africa, South and Western Australia and Chile. Biome is characterized by dry summer with frequent bush fires and very limited winter rain. Humid airh..

(i) Nitrogen is non-poisonous. But animals placed in an atmosphere of nitrogen die due to asphyxiation (lack of oxygen). (ii) Nitrogen dilutes the oxygen of the air and helps in regulating the rate of respiration and combustion. Breathing in pure oxygen enhances the rate..