Which of the following is the chief pigment associated with photosynthesis?
1. chl-a
2. chl-b
3.chl- a and xanthophylls
4.chl-a and carotenoids

Which regions of the visible spectrum are responsible for most of the photosynthesis?
1. blue and yellow
2. blue and red
3. blue and green
4. green and red

How statements are correct?
i. chlorophyll-a , xanthophylls and carotenoids are called as accessory pigments.
ii. accessory pigments protect chlorophyll-a from photo-oxidation.
iii.chlorophylla are the major pigments responsible for trapping of light
iv. chl-a and chl-b forms the reaction centre
v. chl-a transfers the energy to accessory pigments.
1. 2
2. 3
3. 4
4. 5

Photochemical phase does not include-
1. water splitting
2. oxygen release
3. CO₂ assimilation
4. light absorption

Which of the following statement is incorrect?
1. Reaction centre is formed by a group of chl- a molecules.
2. Reaction centre is different in both the photosystems.
3. In PS I the reaction centre chlorophyll a has an absorption peak at 700 nm.
4. In PS II the reaction centre chlorophyll a has absorption maxima at 680 nm.

In photosystem-I, P700 refers to-
1. chl-b
2. chl-a
3. number of pigment molecules
4. absorption peak of chl-a at 700nm

Light harvesting complexes are made up of-
1. proteins
2. pigments
3. protein and pigments
4. proteins and lipids.

In chloroplast the movement of electrons from PS-II to electron transport system is-
1. uphill in terms of redox potential scale.
2. downhill in terms of redox potential scale.
3. from one cytochrome to another
4. None of the above.

Electrons in the reaction center of PS-I are excited by-
1. blue light
2. red light
3. green light
4. blue and red light

Non- cyclic photophosphorylation involves –
1. PS-I
2. PS-II
3. PS-I and PS-II
4. PS-I and LHC