Light Absorbing Pigments

Q. The wavelength of light absorbed by Pr form of phytochrome is:

1. 620 nm
2. 640 nm
3. 680 nm
4. 720 nm

Q.

Are E Coli archaea or a bacteria?

Q. The absorption spectrum of chlorophyll

1. Shows that some colours of light are absorbed more than the others
2. Approximates the action spectrum of photosynthesis
3. Explains why chlorophyll is a green pigment
4. Has all the above properties

Q. Which of the following absorb light energy for photosynthesis?

1. Chlorophyll
2. Water molecule
3. $O_2$
4. RUBP

Q. Which of the following techniques could be used to know about the pigments present in a leaf?

1. Electrophoresis
2. Radioisotope technique
3. Paper chromatography
4. Microscopy

Q. Which one of the following pigments does not occur in the chloroplast?

1. Carotene
2. Xanthophyll
3. Chlorophyll 'b'
4. Anthocyanin

Q. $C_{40}{H}_{56}$ is the empirical formula of

1. Chlorophyll
2. Carotene
3. Xanthophyll
4. Anthocyanin.

Q. Accessory thylakoid pigments like chlorophyll b, xanthophylls and carotenoids play an important role in

1. protecting chlorophyll a from photo-oxidation
2. enabling the chloroplast in utilizing a wider range of wavelengths of incoming light
3. absorbing some amount of light and transfer the energy to chlorophyll a
4. all of the above

Q. Leaves are green in colour because all the green light is reflected by them.

1. True
2. False

Q.

In the thylakoid membranes, what is the main role of the antenna pigment molecules?

1. split water and release oxygen to the reaction-center chlorophyll

2. harvest photons and transfer light energy to the reaction-center chlorophyll

3. synthesize ATP from ADP and Pi

4. transfer electrons to ferredoxin and then NADPH

Q. __________ forms the reaction centre during light reaction of photosynthesis.

1. Chlorophyll a
2. Chlorophyll b
3. Carotene
4. Xanthophyll