Biology Unit-3 Test

It is the by product of photosynthesis:

• CO₂ 

• H₂O  

• O₂

• C₆H₁₂O₆

Light can work in chloroplast if it is:

• Transmitted

• Reflected 

• Absorbed

• Refracted

Main photosynthetic pigments of the plants is:

• Chlorophyll a  

• Chlorophyll b   

• Chlorophyll c

• Xanthophylls

Pyrrole rings of chlorophylls is:

• 4 cornered saturated 

• 5 cornered saturated  

• 4 cornered unsaturated

• 5 cornered unsaturated

  Difference between chlorophyll a and b is due to difference in their:

• Head portion 

• Tail portion

• Both head & tail

• Neither head nor tail

All of the following functions are attributed to carotenoids except:

• Broaden absorption spectrum  

• Dissipation of energy 

• Protection to chlorophylls

• Conversion of energy to ATP

It is also called as energy conservation phase of photosynthesis:

• Light reactions  

• Calvin cycle 

• Krebs cycle

• Glycolysis

Reaction center of a photosystem does not include:

• Chlorophyll a 

• Chlorophyll b  

• Primary electron acceptor

• None of these

Main difference between photosystem I and II lies at:

• Chlorophyll a of antenna complex 

• ETC of antenna complex 

• Wavelength of light they absorbed

• ETC of reaction center

Photoexcited electrons pass from PS II to PS I via:

• Chlorophyll a molecules  

• Chlorophyll b molecules    

• NADPH molecules

• Electron transport chain