Light Absorption | MCQs

Explanation

A material that absorbs all wavelengths (colors) of visible light reflects none, so no light reaches your eyes.

This absence of reflected light makes the object appear black.

Explanation

• If an object absorbs all seven colors of light (i.e., all the wavelengths of visible light), it appears black.
• This is because no light is being reflected, and our eyes perceive the absence of light as black.
• When an object reflects all the component colors of light, it appears white.

Explanation

 A spectrophotometer measures the amount of light absorbed by a substance at different wavelengths.

It is widely used in plant studies to analyze how leaves absorb specific wavelengths of light, which is crucial for understanding photosynthesis.

Explanation

A photometer measures the intensity of light absorbed or transmitted by pigments at different wavelengths.

It is used to study absorption spectra, especially in photosynthesis research.

Explanation

In Photosystem II (PSII), chlorophyll a is present in the reaction center called P680.

P680 absorbs light most efficiently at 680 nm, which lies in the red region of the visible spectrum.

Explanation

The correct option about a chlorophyll molecule is methyl group on second pyrrole ring.

Chlorophyll molecules have a porphyrin ring structure, and in chlorophyll a, there is a methyl group attached to the second pyrrole ring.