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

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
a large tract covered by trees and shrubs and its administration for assessing economic benefits
role played by species of animals in the maintenance of ecological balance

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World Geography
The Penumbra is

None of these
both (a) and (b)
formed by the tangent that intersects between the sun and the moon
the outer portion of the moon's shadow

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