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
Both 1 & 2
Neither 1 & 2
Only 2

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World Geography
The periodic rise and fall of the sea level on the earth, gives rise to tides. This is related to

None of these
infrared rays from the sun
the position of the moon with reference to the earth and the gravitational pull exerted mainly by the moon and partly by the sun
ultraviolet rays from the sun

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World Geography
The initial increase of magnetic field in magnetic storms is caused

when the gust wind itself engulfs the magnetosphere
when there is a large decrease in field intensity
None of these
when the shock wave, associated with the gusty solar wind, compresses the magnetosphere

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