World Geography
The ground water that occurs when flow of the subterranean water is not confined by the presence of impermeable layers is called

confined groundwater
artesian
unconfined groundwater
aquifer

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World Geography
Which among the following statements is/are correct about the symbiotic life of Corals?Algae gives carbon dioxide and other substances the  coral polyp needs.Coral polyp gives off oxygen and other nutrients that the algae needs.Select the correct code from the options given below:

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

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