Statement I : The planet Neptune appears blue in colour. Statement II : The presence of methane gas in the atmosphere of Neptune is responsible for its colour.

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Q: 1 (CDS-II/2012)

Statement I : The planet Neptune appears blue in colour.
Statement II : The presence of methane gas in the atmosphere of Neptune is responsible for its colour.

question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,34,9,34,3,3,3

keywords: 

{'planet neptune': [0, 0, 0, 1], 'neptune': [2, 0, 1, 0], 'methane gas': [0, 0, 0, 1], 'atmosphere': [1, 1, 4, 7], 'colour': [11, 6, 13, 28]}

The correct answer is option 1: Both statements are individually true and statement II is the correct explanation of statement I.

Statement I states that the planet Neptune appears blue in color, which is true. If we observe images of Neptune captured by telescopes, it is evident that the planet has a distinct blue hue.

Statement II suggests that the presence of methane gas in Neptune`s atmosphere is responsible for its color, which is also true. Methane gas absorbs red light and reflects blue light, so when sunlight passes through Neptune`s methane-rich atmosphere, it scatters the blue light, giving the planet its blue appearance.

Option 2 is incorrect because statement II is indeed the correct explanation for statement I. Option 3 is also incorrect because statement I is true. Finally, option 4 is incorrect because statement I is true, as affirmed by images of Neptune, while statement II is also true, as methane`s role in coloring Neptune has been scientifically established.