Assertion (A): Chlorophyll usually show red fluorescence though they absorb blue radiations as well. Reason (R) : In fluorescence, long wave radiations are emitted.

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Q: 97 (CDS-I/2004)
Assertion (A): Chlorophyll usually show red fluorescence though they absorb blue radiations as well.
Reason (R) : In fluorescence, long wave radiations are emitted.

question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,26,37,26,14,5,18

keywords: 

{'red fluorescence': [0, 0, 1, 0], 'chlorophyll': [5, 0, 1, 4], 'fluorescence': [0, 0, 1, 2], 'blue radiations': [0, 0, 1, 0], 'long wave radiations': [0, 0, 1, 0]}

Option 1 states that both Assertion (A) and Reason (R) are true, and that R correctly explains A.

A states that chlorophyll usually shows red fluorescence even though it absorbs blue radiations. This means that chlorophyll absorbs blue light energy during photosynthesis and emits red light energy during fluorescence.

R states that in fluorescence, long wave radiations are emitted. This means that when a substance fluoresces, it emits light of a longer wavelength than the light it absorbed.

Both A and R are true, and R does explain A correctly. Chlorophyll absorbs blue light (shorter wavelength) and emits red light (longer wavelength) during fluorescence. Therefore, option 1 is the correct answer.

No alerts are required as the provided answer is correct.