PLANT PHYSIOLOGY
PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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all colors are absorbed except blue, blue is reflected
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all colors are reflected except blue, blue is absorbed
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Either A or B
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None of the above
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Detailed explanation-1: -An object appears blue in white light because it reflects only blue colour and absorbs the other colours of white light. Now when that object is kept in red light, there is no colour to be reflected, and the object absorbs all the red lights which are falling on it, hence, appearing black.
Detailed explanation-2: -If the material absorbs blue you will see the color orange.
Detailed explanation-3: -A blue coloured item reflects blue and absorbs all other colours except blue. So when an item is said to be black, it reflects no colour: therefore all colours are absorbed.
Detailed explanation-4: -A blue pigment is capable of absorbing yellow light. That is, blue paper can absorb both red and green primary colors of light (recall that yellow light is a mixture of red and green light). So red and green light shine on the paper; and both the red and the green light are subtracted.
Detailed explanation-5: -The blue object absorbs all colors except blue. The red light falling onto its surface is absorbed and the object appears black. White light is a mixture of red, blue and green lights. Objects that appear to be red, for example, absorb every other color except red.