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

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
None of these

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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 2
Neither 1 & 2
Only 1
Both 1 & 2

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World Geography
The sidereal month may be defined as

the period in which the moon completes an orbit around the earth
None of these
the period of rotation of moon
the period in which the moon completes an orbit around the Earth and returns to the same position in the sky

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