Light absorbing pigments

Q. Chlorophyll a, similar to green plants, is found in__________

1. Amoeba
2. Anabaena
3. Nitrobacter
4. All of these

Q. Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants?

1. Red and violet
2. Green and red
3. Violet and blue
4. Blue and green

Q.

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

1. transfer electrons to ferredoxin and then NADPH

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

3. synthesize ATP from ADP and Pi

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

Q. Which of the following is a brown alga?

1. Polysiphonia
2. Chlamydomonas
3. Sargassum
4. Oscillatoria

Q.

How do different pigments affect photosynthesis?

Q. Which of the following pigments is yellow in colour?

1. Chlorophyll “a’
2. Chlorophyll ‘b’
3. Carotene
4. Xanthophylls

Q.

Name the following:

Name the metal present in chlorophyll

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. Which of the following is not made up of proteins?

1. capsomeres
2. pellicle
3. prions
4. diatomaceous earth

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

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

Q.

Both carotenoids and chlorophylls

1. are pigments

2. absorb photons of all energy ranges

3. contain porphyrin rings

4. all of the above

Q. Chlorophyll 𝔟 differs from chlorophyll a in that it does not

1. get excited
2. Produce excited electrons.
3. reduce
4. oxidize

Q. Which of the following is not a part of chlorophyll molecule?

1. Carbon
2. Hydrogen
3. Manganese
4. Magnesium

Q.

Pigment-containing membranous extensions in some cyanobacteria are:

1. Heterocysts

2. Basal bodies

3. Peumatophores

4. Chromatophores

Q. The emperical formula of chlorophyll-b is

1. $C_{66}{H}_{72}{O}_6{N}_4{M}_9$
2. $C_{40}{H}_{56}{O}_2$
3. $C_{55}{H}_{70}{O}_6{N}_4{M}_9$
4. $C_{55}{H}_{72}{O}_5{N}_4{M}_9$

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

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

Q. $C_{40}{H}_{56}{O}_2$ is an empirical formula of a

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

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.

The quantum yield of photosynthesis is measured in terms of

1. The number of oxygen molecules evolved per water molecules broken.

2. The number of oxygen molecules evolved per carbon dioxide molecule fixed.

3. The number of oxygen molecules evolved.

4. The number of oxygen molecules evolved per quantum of light absorbed.

Q. Which element is located at the centre of the porphyrin ring in chlorophyll?

1. Magnesium
2. Calcium
3. Manganese
4. Potassium

Q. Which of the following is the primary photosynthetic pigment?

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

Q.

The absorption and action spectrum of photosynthesis show two maximums, one in the blue region and another in the red. What are the reasons for these?

1. The two pigment systems.

2. The absorbance property of chlorophyll molecules

3. The other colours cannot be absorbed

4. None of these

Q. In heterocysts of Cyanobacteria, PS I & PS II are present which absorb 700nm and 680 nm respectively. This implies that blue light is absorbed by the pigments. Then how is it possible that cyanobacteria and its heterocysts appear blue-green in colour? (my question is not about PS II being active & inactive, but about how is it possible for the organism to have a colour which it absorbs. Kindly answer it accordingly.) Thank you