World Geography
The term 'flora' in the context of natural vegetation refers to

a large tract covered by trees and shrubs and its administration for assessing economic benefits
assemblage of plant species living in association with each other in a given environmental frame
plants of a particular region or period, listed by species and considered as a group
role played by species of animals in the maintenance of ecological balance

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World Geography
Which among the following statements is/are correct about the constituents of the atmosphere?Higher concentration of dust particles is found in the sub tropical and temperate regions.Amount of water vapour decrease with altitudeSelect the correct code from the options given below:

Only 1
Only 2
Both 1 & 2
Neither 1 & 2

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World Geography
The sequence of layers of atmosphere from earth to upwards is

troposphere, tropopause, stratosphere, mesosphere , exosphere, thermosphere, thermopause
troposphere, tropopause, stratosphere, stratopause, mesosphere, mesopause, ionosphere(thermosphere, thermopause, exosphere)
troposphere, stratosphere, stratopause, mesosphere , ionosphere
troposphere, tropopause, stratosphere, thermosphere, exosphere

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